Fabrication, modeling, and characterization of porous shape memory alloys

Dimitris C. Lagoudas; Pavlin B. Entchev; Eric L. Vandygriff

doi:10.1117/12.432750

11 July 2001 Fabrication, modeling, and characterization of porous shape memory alloys

Dimitris C. Lagoudas, Pavlin B. Entchev, Eric L. Vandygriff

Proceedings Volume 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics; (2001) https://doi.org/10.1117/12.432750
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

Abstract

This paper will present powder metallurgical methods for producing porous NiTi from elemental powders of 50at% Ni and 50at% Ti using a sintering approach in a high pressure environment. Different pore sizes and volume fractions of NiTi SMAs are fabricated and characterized in terms of composition and phase transformation characteristics using calorimetric measurements. Quasi-static and dynamic loading experiments are conducted on samples produced with the presented methodology and their shape recovery and energy absorption characteristics are measured during the forward and reverse phase transformation and detwinning. A micromechanical averaging method for modeling the behavior of porous SMAs is presented. Correlation of experimental results with theoretical predictions of the micromechanical method for the case of quasi-static loading is discussed.

Citation Download Citation

Dimitris C. Lagoudas, Pavlin B. Entchev, and Eric L. Vandygriff "Fabrication, modeling, and characterization of porous shape memory alloys", Proc. SPIE 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics, (11 July 2001); https://doi.org/10.1117/12.432750

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