Origins of asymmetric stress-strain response in phase transformations
It has been determined that the transformation stress-strain behavior of CuZnAl and NiTi shape memory alloys is dependent on the applied stress state. The uniaxial compressive stress necessary to macroscopically trigger the transformation is approximately 34% (CuZnAl) and 26% (NiTi) larger than the required uniaxial tensile stress. For three dimensional stress states, the response of either alloy system is dependent on the directions of the dominant principal stresses along with the hydrostatic stress component of the stress state. The stress state effects are dominated by the favored growth and nucleation of more martensite plates in tension versus compression. The effect of different hydrostatic pressure levels between stress states on martensite plates volume change is considered small.
- Publication Date:
- OSTI Identifier:
- Report Number(s):
ON: DE98000902; TRN: 98:000865-0025
- DOE Contract Number:
- Resource Type:
- Resource Relation:
- Conference: 15. symposium on energy engineering sciences, Argonne, IL (United States), 14-16 May 1997; Other Information: PBD: 1997; Related Information: Is Part Of Proceedings of the fifteenth symposium on energy engineering sciences; PB: 285 p.
- Research Org:
- Argonne National Lab., IL (United States)
- Country of Publication:
- United States
- 36 MATERIALS SCIENCE; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; PHASE TRANSFORMATIONS; STRESS ANALYSIS; STRAINS; COPPER BASE ALLOYS; ZINC ALLOYS; ALUMINIUM ALLOYS; NICKEL BASE ALLOYS; TITANIUM ALLOYS; SHAPE MEMORY EFFECT
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