Fastener systems that provide EME protection

Fasteners are inserted into a stack of members and terminated with parts having at least one of a dry dielectric coating and an inner dry dielectric seal at select locations to protect against electromagnetic effects (EME).

Fastener systems that provide EME protection

Fasteners are inserted into a stack of members and terminated with parts having at least one of a dry dielectric coating and a dry dielectric seal at select locations to protect against electromagnetic effects (EME).

FASTENER SYSTEMS THAT PROVIDE EME PROTECTION

Fasteners are inserted into a stack of members and terminated with parts having at least one of a dry dielectric coating and a dry dielectric seal at select locations to protect against electromagnetic effects (EME). 1. A method of fastening a stack of members , comprising:inserting fasteners into the stack of members; and a fastener termination body having a central opening and a washer;', 'a dry dielectric coating on the fastener termination body; and', 'a first dielectric seal secured to the fastener termination body and partially covering the central opening at one of a distal and proximal location;', 'wherein each of the dry dielectric coating and the first dielectric seal has a thickness and composition for inhibiting lightning current., 'terminating the fasteners with a part, the part including2. The method of claim 1 , wherein the first dielectric seal is configured to protect against arcing claim 1 , sparking and hot particle ejection claim 1 , and wherein the dry dielectric coating is configured to protect against arcing and sparking.3. The method of claim 1 , wherein the stack of members comprises a stack of aircraft members claim 1 , and wherein at least one member of the stack of aircraft members comprises a composite material.4. The method of claim 1 , wherein the stack of members includes an aircraft skin and a metal member.5. The method of claim 1 , wherein inserting at least one of the fasteners includes fitting a fastener shaft into a through-hole in the stack claim 1 , the method further comprising coating the fastener shaft with a dry resin including electrically conductive particles.6. The method of claim 1 , wherein inserting at least one of the fasteners includes fitting a fastener shaft into a through-hole in the stack claim 1 , the fastener including a head and a dielectric seal at a proximal location on the head.7. The method of claim 1 , wherein inserting at least one of the fasteners includes inserting a fastener head having an upper ...

METHOD OF INSTALLING A STRUCTURAL BLIND FASTENER

A two-piece, one-sided-installation fastener system may have an internally-threaded sleeve having a shank and a sleeve head. The fastener system may include an externally-threaded core bolt having a frangible driving provision and a core bolt head. 1. A method of installing a two-piece , one-sided-installation fastener system , comprising:inserting a core bolt and a sleeve into a hole of a structure having a front side and a back side, the core bolt having a frangible driving provision coupled to a core bolt head;translating the core bolt backward away from the front side of the hole;buckling a softened portion of the sleeve to form a buckled sleeve portion;flattening the buckled sleeve portion against the back side of the hole; androtating the core bolt relative to the sleeve to apply tension in the fastener system.2. The method of claim 1 , further comprising the step of:separating the frangible driving provision from the core bolt head at a pre-defined fastener preload.3. The method of claim 2 , wherein the step of separating the frangible driving provision from the core bolt head includes at least one of:exceeding a torsional capability of an interface between the frangible driving provision and the core bolt head;axially pulling on the frangible driving provision until exceeding a tension capability at the interface; andbending the frangible driving provision until exceeding a bending capability of the interface.4. The method of claim 3 , wherein the step of separating the frangible driving provision from the core bolt head comprises:separating the frangible driving provision from the core bolt head at a break groove formed at the interface.5. The method of claim 1 , wherein:the softened portion comprises a localized annealed portion extending along a portion of a sleeve length.6. The method of claim 1 , wherein the step of buckling the softened portion of the sleeve includes:buckling the softened portion into a single buckled sleeve portion against the back ...

Structural blind fastener and method of installation

A two-piece, one-sided-installation fastener system may have an internally-threaded sleeve having a shank and a sleeve head. The fastener system may include an externally-threaded core bolt having a frangible driving provision and a core bolt head.

Modified shank fasteners for electromagnetic effect (EME) technology

A fastener system for composite structure providing electromagnetic energy protection has a shank with a threaded portion on a first end of the shank terminating in a lead-in portion. A head is present on a second end of the shank. The shank is adapted for intimate conductive contact with an inner surface of an interference fit hole.

BUSHING ASSEMBLY AND METHOD OF ASSEMBLING SAME

A bushing assembly includes a washer that includes an opening defined therethrough. A cylindrical body includes a first end that is sized to be inserted within the washer opening and an opposite second end. The cylindrical body is fabricated from a smart material that is configured to selectively expand when at least a portion of the body is positioned within the washer opening. 1. A bushing assembly comprising:a washer comprising an opening defined therethrough; anda cylindrical body comprising a first end that is sized to be inserted within the washer opening and an opposite second end, said cylindrical body fabricated from a smart material that is configured to selectively expand when at least a portion of said body is positioned within the washer opening.2. A bushing assembly in accordance with claim 1 , wherein said cylindrical body is configured to be secured within the washer opening in an interference fit.3. A bushing assembly in accordance with claim 1 , wherein said washer further comprises an inner surface formed with a first configuration claim 1 , and said cylindrical body first end further comprises an outer surface formed with a second configuration that is substantially complementary to the first configuration.4. A bushing assembly in according with claim 1 , wherein said washer further comprises a plurality of notches spaced circumferentially about the washer opening claim 1 , and said first end of said cylindrical body further comprises a plurality of projections that are sized and oriented to fit within the plurality of notches.5. A bushing assembly in accordance with claim 1 , wherein said washer further comprises a recessed inner rim extending circumferentially about the washer opening claim 1 , and said first end of said cylindrical body comprises a lip that is sized and oriented to fit within the recessed inner rim such that an upper surface of said cylindrical body is substantially flush with an upper surface of said washer when at least said ...

BUSHING FOR USE IN PROVIDING ELECTROMAGNETIC EFFECTS PROTECTION

A system includes a composite structure and a bushing. The composite structure includes an opening defined therethrough. The bushing includes a cylindrical body sized to be secured within the opening in an interference fit to facilitate providing electromagnetic effects protection in the composite structure. The cylindrical body is fabricated from a conductive material. 1. A method of providing electromagnetic effects protection in a composite structure , said method comprising:providing a bushing including a cylindrical body fabricated from a conductive material; andinserting the bushing within an opening defined in the composite structure such that the bushing is secured within the opening in an interference fit to facilitate providing the electromagnetic effects protection in the composite structure.2. The method in accordance with further comprising coupling a fitting to the bushing such that there is metal-to-metal contact therebetween.3. The method in accordance with claim 2 , wherein inserting the bushing within an opening further comprises positioning the bushing such that the cylindrical body channels electromagnetic effects between the composite structure and the fitting.4. The method in accordance with further comprising positioning a sealing mechanism between the fitting and the composite structure5. The method in accordance with further comprising providing the composite structure that is fabricated from a plurality of fibers.6. The method in accordance with further comprising providing the composite structure that is fabricated from a carbon-fiber-reinforced polymer material.7. The method in accordance with claim 1 , wherein providing a bushing further comprises providing the cylindrical body that is fabricated from a conductive material.8. The method in accordance with claim 1 , inserting the bushing within an opening further comprises positioning the bushing in robust contact with the composite structure along at least a length of the cylindrical ...

THIN WALL BUSHING FOR ROBUST ELECTRICAL BONDING TO FIBER-REINFORCED STRUCTURES

A method for directing electrical current to prevent sparking from the interaction between a composite structure and lightning or static electrical charge, the method including the steps of forming a hole in a composite structure; and positioning a bushing into the hole to create an interference fit between the bushing and the composite structure, wherein the bushing is formed of a material that has a coefficient of thermal expansion close to the coefficient of thermal expansion of the composite structure and the bushing provides an electrical path between a fastener disposed in the bushing and the composite structure. 1. A method for providing robust electrical bonding to a composite structure , said method comprising the steps of:forming a hole in a composite structure; andpositioning a bushing into the hole to create an interference fit between the bushing and the composite structure, wherein said bushing is formed of a material that has a coefficient of thermal expansion within about 300% of the coefficient of thermal expansion of the composite structure and said bushing provides an electrical path between a fastener disposed in said bushing and the composite structure.2. The method of wherein said bushing is formed of tungsten claim 1 , rhenium claim 1 , nickel claim 1 , iron or alloys containing these materials.3. The method of wherein said composite structure comprises carbon fibers.4. The method of wherein said composite structure comprises a carbon reinforced polymer material.5. The method of wherein said bushing is cylindrical with a wall thickness of between about 0.010 and 0.020 inches.6. The method of wherein said bushing further comprises an annular flange at one end of the bushing.7. The method of further comprising temporarily expanding the hole prior to positioning the bushing in the hole.8. The method of wherein a tapered lead-in mandrel is used to temporarily expand the hole and position the bushing in the hole.9. The method of wherein the mandrel ...

FASTENER SYSTEMS THAT PROVIDE EME PROTECTION

Fasteners are inserted into a stack of members and terminated with parts having at least one of a dry dielectric coating and a dry dielectric seal at select locations to protect against electromagnetic effects (EME). 1. A method comprising inserting fasteners into a stack of members and terminating the fasteners with parts having at least one of a dry dielectric coating and a dry dielectric seal at select locations to protect against electromagnetic effects (EME).2. The method of claim 1 , wherein the seal is used to protect against arcing claim 1 , sparking and hot particle ejection; and wherein the coating is used to protect against arcing and sparking.3. The method of claim 1 , wherein the members are aircraft members at least one of which is made of composite material.4. The method of claim 1 , wherein the members include aircraft skin and a metal member.5. The method of claim 1 , wherein inserting at least one of the fasteners includes fitting a fastener shaft into a through-hole in the stack claim 1 , the shaft coated with a dry resin including electrically conductive particles.6. The method of claim 1 , wherein inserting at least one of the fasteners includes fitting a fastener shaft into a through-hole in the stack claim 1 , the fastener including a head and a dielectric seal at a proximal location on the head.7. The method of claim 1 , wherein inserting at least one of the fasteners includes inserting a fastener head having an upper surface with multiple mechanical interlocking sites that are configured to retain a dielectric layer claim 1 , the dielectric layer covering the upper surface of the head claim 1 , the dielectric mechanically interlocked with the interlocking sites.8. The method of claim 1 , wherein terminating a fastener includes terminating the fastener with a body having a central opening and at least one feature for protecting against EME effects claim 1 , the at least one feature being at least one of a dry dielectric coating and a dry ...

FASTENER SYSTEMS THAT PROVIDE EME PROTECTION

Fasteners are inserted into a stack of members and terminated with parts having at least one of a dry dielectric coating and an inner dry dielectric seal at select locations to protect against electromagnetic effects (EME). 1. A method comprising inserting fasteners into a stack of members and terminating the fasteners with parts having at least one of a dry dielectric coating and an inner dry dielectric seal at select locations to protect against electromagnetic effects (EME).2. The method of claim 1 , wherein the seal is used to protect against arcing claim 1 , sparking and hot particle ejection; and wherein the coating is used to protect against arcing and sparking.3. The method of claim 1 , wherein the members are aircraft members claim 1 , at least one of which is made of composite material.4. The method of claim 1 , wherein the members include aircraft skin and a metal member.5. The method of claim 1 , wherein at least one of the fasteners is interference-fitted into a through hole in the stack.6. The method of claim 1 , wherein terminating the fasteners includes using at least one part having a central opening and at least one EME protective feature including a dry dielectric coating and a dry inner dielectric seal claim 1 , the seal secured to and protruding axially from the central opening.7. The method of claim 1 , wherein at least some of the fasteners are terminated with a combination of a washer and nut claim 1 , the washer having an inner proximal seal and an outer surface coated with a dielectric coating claim 1 , the nut having an outer proximal seal claim 1 , an inner proximal seal claim 1 , and an inner distal dielectric coating.8. The method of claim 1 , wherein at least some of the fasteners are terminated with a combination of a washer and nut claim 1 , the washer having an inner proximal seal claim 1 , the nut having an inner proximal seal claim 1 , an inner distal dielectric coating claim 1 , and an exterior dielectric coating.9. The method of ...

STRUCTURAL BLIND FASTENER AND METHOD OF INSTALLATION

A two-piece, one-sided-installation fastener system may have an internally-threaded sleeve having a shank and a sleeve head. The fastener system may include an externally-threaded core bolt having a frangible driving provision and a core bolt head. 1. A two-piece , one-sided-installation fastener system , comprising:an internally-threaded sleeve having a shank and a sleeve head; andan externally-threaded core bolt having a frangible driving provision and a core bolt head.2. The system of claim 1 , wherein the sleeve includes a softened portion.3. The system of claim 2 , wherein the softened portion buckles against a structure into a buckled sleeve portion.4. The system of claim 3 , wherein the buckled sleeve portion has a minimum diameter of approximately 1.2 times the sleeve outside diameter.5. The system of claim 1 , wherein the sleeve includes a locking feature restricting rotation of the core bolt relative to the sleeve.6. The system of claim 1 , wherein the sleeve head includes an anti-rotation feature.7. The system of claim 6 , wherein the anti-rotation feature comprises at least one of an indentation and a protrusion on the sleeve head.8. The system of claim 1 , wherein the frangible driving provision includes at least one of:an axial translation feature; anda rotation feature.9. The system of claim 8 , wherein the axial translation feature comprises at least one of helical threads and annular grooves.10. The system of claim 8 , wherein the rotation feature comprises one or more faceted surfaces formed on the frangible driving provision.11. The system of claim 1 , wherein the frangible driving provision comprises a frangible pintail having a break groove at an interface between the frangible pintail and the core bolt head.12. A two-piece claim 1 , one-sided-installation fastener system claim 1 , comprising:an internally-threaded sleeve having a shank and a sleeve head;an externally-threaded core bolt having a frangible driving provision and a core bolt head; ...

DUAL PROTECTION INNER SEAL WASHER FOR ELECTROMAGNETIC EFFECTS (EME) FASTENERS

A dual protection inner seal washer employs a radially outward metallic portion having a dielectric coating and a radially inward polymeric portion engaging the metallic portion at an interface with an interference fit. The polymeric portion has at least one tapering compression surface to engage a surface of a structure proximate a hole and further has a fastener element contact surface to engage a mating surface on a fastener system element. Torqueing of the fastener element compresses the at least one compression surface inducing a predetermined pressure in the polymeric portion in a joint created by the fastener element and structure. 1. A dual protection inner seal washer comprising:a radially outward metallic portion having a dielectric coating;a radially inward polymeric portion engaging the metallic portion at an interface with an interference fit, said polymeric portion having at least one tapering compression surface to engage a surface of a structure proximate a hole and having a fastener element contact surface to engage a mating surface on a fastener system element, wherein torqueing of the fastener system element compresses the at least one tapering compression surface inducing a predetermined pressure in the radially inward polymeric portion in a joint created by the fastener system element and structure.2. The dual protection inner seal washer as defined in wherein the at least one tapering compression surface comprises an initial contact surfaces proximate an inner diameter (ID) of the radially inward polymeric portion.3. The dual protection inner seal washer as defined in wherein the at least one tapering compression surface additionally comprises a tapering segment extending from the initial contact surface to an outer diameter (OD) of the radially inward polymeric portion.4. The dual protection inner seal washer as defined in wherein the fastener system element is a nut and the fastener element contact surface comprises a second tapering ...

Self-aligning sleeved protruding head fasteners with electromagnetic effect protection features

A fastener system for composite structure provides electromagnetic energy protection by incorporating a self-aligning head (SAH) fastener having a head with a spherical engaging surface and a shank extending from the head for insertion through a hole in a composite structure and a self-aligning self sealing (SASS) washer having a throat receiving the shank and a spherical mating surface interfacing with the spherical engaging surface of the head.

NUT, WASHER & FASTENER HEAD FOR ELECTROMAGNETIC EFFECT PROTECTION

A fastener system for composite structure providing electromagnetic energy (EME) protection incorporates a fastener having a head with an engagement surface and a shank having a threaded end. A nut is received on the threaded end of the fastener, with the nut also having an engagement surface. At least one of the head engagement surface and the nut engagement surface incorporates a reduced area portion for engagement of a first mating surface or second mating surface, respectively. 2. The fastener system as defined in further comprising a washer having an engagement surface and the first mating surface for engaging the engagement surface of the fastener head claim 1 , wherein at least one of the head engagement surface claim 1 , the nut engagement surface and the washer engagement surface incorporates a reduced area portion engaging the first mating surface claim 1 , the second mating surface or a third mating surface claim 1 , respectively.3. The fastener system as defined in further comprising a sleeve receiving the fastener and having a flange and wherein the first or third mating surface is on the flange.4. The fastener system as defined in wherein the first mating surface is on a structure having a hole receiving the fastener.5. The fastener system as defined in wherein the second mating surface is on the structure opposite the first mating surface.6. The fastener system as defined in wherein the third mating surface is on a structure having a hole receiving the fastener.7. The fastener system as defined in wherein the second mating surface is on the structure opposite the first mating surface.8. The fastener system as defined in wherein at least one of the head of the fastener claim 2 , the nut and the washer further incorporates at least one endothermic chamber extending from the respective engagement surface.9. The fastener system as defined in wherein the at least one endothermic chamber includes a vertex oriented radially inward at a radially outward ...

MODIFIED SHANK FASTENERS FOR ELECTROMAGNETIC EFFECT (EME) TECHNOLOGY

A fastener system for composite structure providing electromagnetic energy protection has a shank with a threaded portion on a first end of the shank terminating in a lead-in portion. A head is present on a second end of the shank. The shank is adapted for intimate conductive contact with an inner surface of an interference fit hole. 1. A fastener system for composite structure comprising;a shank;a threaded portion on a first end of the shank terminating in a lead-in portion and,a head on a second end of the shank;wherein the shank is adapted for intimate conductive contact with an inner surface of an interference fit hole in a composite.2. The fastener system as defined in wherein the lead-in portion is configured to expand the inner surface of the interference fit hole without damaging the composite.3. The fastener system as defined in wherein the shank is in intimate conductive contact with the inner surface of the hole to conduct large current densities.4. The fastener system as defined in wherein the threaded portion and the lead in portion are coated in dry lubricant.5. The fastener system as defined in Wherein the shank has a roughened main body with peaks and valleys and further comprising a lubricious coating on the main body said coating polished for exposure of the peaks to maintain intimate conductive contact claim 1 , while remaining present in the valleys for lubricious insertion into the interference fit hole.6. The fastener system as defined in wherein the roughened main body is knurled.7. The fastener system as defined in wherein the lubricious coating is one of a phenolic resin base containing lubricating pigments claim 5 , epoxy based coatings claim 5 , and other solid film lubricants that are resin or ceramic based claim 5 , with solid lubricant additives.8. The fastener system as defined in wherein a soft metal layer is deposited on the shank claim 1 , said soft metal layer shearing fix insertion in the interference fit hole while maintaining ...

Modified shank fasteners for electromagnetic effect (eme) technology

A fastener system (10) for composite structure (30) providing electromagnetic energy protection has a shank (12) with a threaded portion (14) on a first end of the shank (12) terminating in a lead-in portion (18). A head (16) is present on a second end of the shank (12). The shank (12) is adapted for intimate conductive contact with an inner surface of an interference fit hole (30).

Modified shank fasteners for electromagnetic effect (eme) technology

A fastener system for composite structure providing electromagnetic energy protection has a shank with a threaded portion on a first end of the shank terminating in a lead-in portion. A head is present on a second end of the shank. The shank is adapted for intimate conductive contact with an inner surface of an interference fit hole.

Nut, washer & fastener head for electromagnetic effect protection

A fastener system for composite structure providing electromagnetic energy (EME) protection incorporates a fastener having a head with an engagement surface and a shank having a threaded end. A nut is received on the threaded end of the fastener, with the nut also having an engagement surface. At least one of the head engagement surface and the nut engagement surface incorporates a reduced area portion for engagement of a first mating surface or second mating surface, respectively.

Nut, washer & fastener head for electromagnetic effect protection

A fastener system for composite structure providing electromagnetic energy (EME) protection incorporates a fastener having a head with an engagement surface and a shank having a threaded end. A nut is received on the threaded end of the fastener, with the nut also having an engagement surface. At least one of the head engagement surface and the nut engagement surface incorporates a reduced area portion for engagement of a first mating surface or second mating surface, respectively.

Bushing for use in providing electromagnetic effects protection

A system includes a composite structure and a bushing. The composite structure includes an opening defined therethrough. The bushing includes a cylindrical body sized to be secured within the opening in an interference fit to facilitate providing electromagnetic effects protection in the composite structure. The cylindrical body is fabricated from a conductive material.

METHOD, FASTENER, AND, GRIP SYSTEM

método, prendedor, e, sistema de preensão. prendedores são inseridos em uma pilha de elementos e terminados com partes tendo pelo menos um dentre um revestimento dielétrico seco e uma vedação dielétrica em locais selecionados para proteção contra efeitos eletromagnéticos (eme). method, fastener, and gripping system. fasteners are inserted into a stack of elements and terminated with parts having at least one of a dry dielectric coating and a dielectric seal at selected locations to protect against electromagnetic (eme) effects.

Bushing for use in providing electromagnetic effects protection

A system includes a composite structure and a bushing. The composite structure includes an opening defined therethrough. The bushing includes a cylindrical body sized to be secured within the opening in an interference fit to facilitate providing electromagnetic effects protection in the composite structure. The cylindrical body is fabricated from a conductive material.

Dual protection inner seal washer for electromagnetic effects (eme) fasteners

A dual protection inner seal washer employs a radially outward metallic portion (12) having a dielectric coating and a radially inward polymeric portion (18) engaging the metallic portion at an interface with an interference fit. The polymeric portion has at least one tapering compression surface (24, 30) to engage a surface of a structure proximate a hole and further has a fastener element contact surface (26, 56) to engage a mating surface on a fastener system element. Torqueing of the fastener element compresses the at least one compression surface inducing a predetermined pressure in the polymeric portion in a joint created by the fastener element and structure.

Fastening assembly including washer for sealing the assembly for lightning strike protection in composite structures

A washer, a fastening assembly including the washer and a composite structure including the washer sealing the assembly for internal lightning strike protection. The washer includes one or more concentric ribs that are dielectric rings on both sides. When used (e.g., with a nut and bolt) internal to a structure, especially a composite structure, the washer seals the fastener hole (i.e., that the bolt passes through) and contains any sparking and hot gasses that may arise in the fastener hole from entering the structure.

Modified shank fasteners for electromagnetic effect (eme) technology

A fastener system for composite structure providing electromagnetic energy protection has a shank with a threaded portion on a first end of the shank terminating in a lead-in portion. A head is present on a second end of the shank. The shank is adapted for intimate conductive contact with an inner surface of an interference fit hole.

Fastener systems that provide eme protection

A fastener comprises a fastener head having an upper surface with at least five and no more than nine mechanical interlocking sites, each interlocking site including a protrusion extending upward from the upper surface and having an undercut portion proximate to the upper surface; and a dry dielectric layer covering the upper surface of the fastener head, the dry dielectric layer mechanically interlocked with the mechanical interlocking sites.

Fastener systems that provide eme protection

Fasteners are inserted into a stack of members and terminated with parts having at least one of a dry dielectric coating and a dry dielectric seal at select locations to protect against electromagnetic effects (EME).

Fastening assembly including washer for sealing the assembly for lightning strike protection in composite structures

A fastening assembly for a composite structure including a washer sealing the assembly for internal lightning strike protection. The washer includes one or more concentric ribs that are dielectric rings on both sides. When used (e.g., with a nut and bolt) internal to a structure, especially a composite structure, the washer seals the fastener hole (i.e., that the bolt passes through) and contains any sparking and hot gasses that may arise in the fastener hole from entering the structure.

Dual protection inner seal washer for electromagnetic effects (eme) fasteners

A dual protection inner seal washer employs a radially outward metallic portion (12) having a dielectric coating and a radially inward polymeric portion (18) engaging the metallic portion at an interface with an interference fit. The polymeric portion has at least one tapering compression surface (24, 30) to engage a surface of a structure proximate a hole and further has a fastener element contact surface (26, 56) to engage a mating surface on a fastener system element. Torqueing of the fastener element compresses the at least one compression surface inducing a predetermined pressure in the polymeric portion in a joint created by the fastener element and structure.

Bushing assembly and method of assembling same

Dual protection inner seal washer for electromagnetic effects (EME) fasteners

EDITORIAL NOTE APPLICATION NUMBER - 2018204823 Please note: Abstract page 15 should be numbered 17. 15 DUAL PROTECTION INNER SEAL WASHER FOR ELECTROMAGNETIC EFFECTS (EME) FASTENERS ABSTRACT A dual protection inner seal washer employs a radially outward metallic portion (12) having a dielectric coating and a radially inward polymeric portion (18) engaging the metallic portion at an interface with an interference fit. The polymeric portion has at least one tapering compression surface (24, 30) to engage a surface of a structure proximate a hole and further has a fastener element contact surface (26, 56) to engage a mating surface on a fastener system element. Torqueing of the fastener element compresses the at least one compression surface inducing a predetermined pressure in the polymeric portion in a joint created by the fastener element and structure.

Thin wall bushing for robust electrical bonding to fiber-reinforced structures

A method for providing robust electrical bonding to a composite structure (26) includes forming a hole (28) in a composite structure (26), and positioning a bushing (20) into the hole (28) to create an interference fit between the bushing (20) and the composite structure (26), wherein the bushing (20) is formed of a material that has a coefficient of thermal expansion within about 300% of the coefficient of thermal expansion of the composite structure (26) and the bushing (20) provides an electrical path between a fastener (36) disposed in the bushing (20) and the composite structure (26).

Bushing assembly and method of assembling same

A bushing assembly (100) includes a washer (110) that includes an opening (130) defined therethrough. A cylindrical body (120) includes a first end (230) that is sized to be inserted within the washer opening and an opposite second end (240). The cylindrical body (120) is fabricated from a smart material that is configured to selectively expand when at least a portion of the body is positioned within the washer opening (130).

Thin wall bushing for robust electrical bonding to fiber-reinforced structures

A method for providing robust electrical bonding to a composite structure (26) includes forming a hole (28) in a composite structure (26), and positioning a bushing (20) into the hole (28) to create an interference fit between the bushing (20) and the composite structure (26), wherein the bushing (20) is formed of a material that has a coefficient of thermal expansion within about 300% of the coefficient of thermal expansion of the composite structure (26) and the bushing (20) provides an electrical path between a fastener (36) disposed in the bushing (20) and the composite structure (26).

Thin wall bushing for robust electrical bonding to fiber-reinforced structures

Anilha de vedação interna de dupla proteção para fixadores de efeitos eletromagnéticos (eme) e método para proteção otimizada contra efeitos eletromagnéticos em uma junta

NILHA DE VEDAÇÃO INTERNA DE DUPLA PROTEÇÃO PARA FIXADORES DE EFEITOS ELETROMAGNÉTICOS (EME). Anilha de vedação interna de dupla proteção emprega uma porção metálica radialmente para fora (12) que tem um revestimento dielétrico e uma porção polimérica radialmente para dentro (18) que encaixa a porção metálica em uma interface com um ajuste de interferência. A porção polimérica tem, pelo menos, uma superfície de compressão que se afunila (24, 30) para encaixar uma superfície de uma estrutura próxima de um furo e ainda tem uma superfície de contato de elemento fixador (26, 56) para encaixar uma superfície de acoplamento em um elemento do sistema fixador. O torque do elemento fixador comprime a pelo menos uma superfície de compressão, induzindo uma pressão predeterminada na porção polimérica em uma junta criada pelo elemento fixador e estrutura.

Bushing assembly and method of assembling same

A bushing assembly (100) includes a washer (110) that includes an opening (130) defined therethrough. A cylindrical body (120) includes a first end (230) that is sized to be inserted within the washer opening and an opposite second end (240). The cylindrical body (120) is fabricated from a smart material that is configured to selectively expand when at least a portion of the body is positioned within the washer opening (130).

Nut, washer and fastener head for electromagnetic effect protection

A fastener system for composite structure providing electromagnetic energy (EME) protection incorporates a fastener having a head with an engagement surface and a shank having a threaded end. A nut is received on the threaded end of the fastener, with the nut also having an engagement surface. At least one of the head engagement surface and the nut engagement surface incorporates a reduced area portion for engagement of a first mating surface or second mating surface, respectively.