Development of passive smart structural attachment fixtures

Larry D. Thompson; Bruce D. Westermo; Will Law; Robert Trombi; Raymond Waldbusser

doi:10.1117/12.274667

23 May 1997 Development of passive smart structural attachment fixtures

Larry D. Thompson, Bruce D. Westermo, Will Law, Robert Trombi, Raymond Waldbusser

Proceedings Volume 3044, Smart Structures and Materials 1997: Industrial and Commercial Applications of Smart Structures Technologies; (1997) https://doi.org/10.1117/12.274667
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

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.

Citation Download Citation

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); https://doi.org/10.1117/12.274667

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