14 June 2000 Characterization of structure/property relationships for smart ferromagnetic sensor materials
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TRIP steels have been used as sensors for smart solid-state damage assessment systems. TRIP steels are materials which change state from austenitic, nonmagnetic to a martensitic, ferromagnetic phase as the material undergoes straining. There is a direct correspondence of the peak strain level experienced in the material with the percentage of ferromagnetism, hence monitoring the relative among of the ferromagnetic content will indicate the level of strain. The phase transition that accompanies the straining is irreversible so the monitor material indicates the peak strain until that value is subsequently exceeded. Materials research discussed will cover the selection of compositions with a suitable ferromagnetic response and the development of thermomechanical treatments to achieve high tensile strength required for this application. Tensile properties and related phase changes are described.
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John S. Dunning, John S. Dunning, } "Characterization of structure/property relationships for smart ferromagnetic sensor materials", Proc. SPIE 3992, Smart Structures and Materials 2000: Active Materials: Behavior and Mechanics, (14 June 2000); doi: 10.1117/12.388242; https://doi.org/10.1117/12.388242

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