23 May 1997 Development of passive smart structural attachment fixtures
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Abstract
This paper discusses efforts related to the development and evaluation of smart bolts and fasteners. The work has been directed at meeting the high-strength application requirements for the aircraft industry and selected applications within the construction industry. The fasteners are fabricated from metastable austenitic steel materials which progressively and irreversibly transform from a non- ferromagnetic, austenitic parent phase to a thermodynamically stable, ferromagnetic martensitic phase as a function of applied strain. Thus, the ferromagnetic response of an in-place fastener can be used to indicate the degree of inelastic deformation, i.e., the peak, post-yield, strain, that it has experienced up to that time. A combination of alloy chemistry and thermomechanical treatment was utilized to produce the desired martensitic transformation vs. peak strain behavior. A discussion of the smart materials behavior of the fasteners will be followed by a presentation of recent test results which illustrate the structural bolt monitoring technique with some possible applications.
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Larry D. Thompson, Bruce D. Westermo, Will Law, Robert Trombi, and Raymond Waldbusser "Development of passive smart structural attachment fixtures", Proc. SPIE 3044, Smart Structures and Materials 1997: Industrial and Commercial Applications of Smart Structures Technologies, (23 May 1997); doi: 10.1117/12.274667; https://doi.org/10.1117/12.274667
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