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Self expanding fastener

A fastener and free technology, applied in the direction of fixing devices, connecting components, key connections, etc., can solve problems such as infrequent use

Active Publication Date: 2012-08-15
THE BOEING CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they are not used very often as specialized freeze inserts are usually required to fit the fastener into the hole

Method used

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Embodiment Construction

[0019] In the following description, numerous specific details are set forth to provide a thorough understanding of various embodiments. However, it will be understood by those skilled in the art that various embodiments may be practiced without these specific details. In other instances, well-known methods, procedures and components have not been shown or described in detail so as not to obscure the specific embodiments.

[0020] Described herein are self-expanding fasteners, methods of use, and structural assemblies including self-expanding fasteners. In some embodiments, the fasteners described herein can be used to hold two or more structures together, with the ability to expand upon insertion to allow the fastener to form an interference or tightness with the two structures it is fastened to ability to contact. The expansion of the fastener in the hole can plastically harden the surface of the hole in the structure and produce a compressive residual stress approximately...

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Abstract

In one embodiment a method to join a first structure (410) to a second structure (415), comprises aligning a first hole in the first structure with a second hole in the second structure and inserting a fastener (420) into the first hole and the second hole. The fastener (420) comprises a shape memory alloy which was formed into a first shape having a diameter slightly larger than a diameter of the first hole and the second hole when the shape memory alloy was in an austenite state and reduced to a second shape having a diameter less than the diameter of the first hole and the second hole when the shape memory alloy was in a martensite state. The method further comprises heating the fastener above an austenite start transition temperature, such that the fastener initiates free expansion from the second shape back to the first shape and establishes physical contact with the surface of the first hole and the second hole and continuing to heat the fastener such that first structure and the second structure proximate the holes and the fastener undergo plastic deformation.

Description

technical field [0001] The subject matter described herein relates to fasteners. More particularly, the present disclosure relates to self-expanding fasteners, methods of using self-expanding fasteners, and structural assemblies including self-expanding fasteners. Background technique [0002] Forming the structure of a vehicle such as an airplane, rocket, automobile, or ship requires joining two or more structural components. For example, aircraft wing skins need to be attached to spars or ribs, fuselage skins need to be attached to frames or stringers / stringers, or skins need to be attached to another skin segment via lap joints. Various types of fasteners can be used to join such components. [0003] Fasteners known in the aerospace industry as Class I fasteners rely on the contact of the mechanical fastener with the structural components that make up the joint to provide efficient load transfer through shear forces. Many aerospace structures employ Class I fasteners, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B1/00
CPCF16B1/00F16B13/04F16B2200/77F16B3/00Y10T29/49865Y10T29/49954
Inventor B·L·柯克伍德L·C·弗斯R·D·韦德W·B·克劳
Owner THE BOEING CO
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