Thermomechanical response of shape memory composites

Journal Article · Sun May 01 00:00:00 EDT 1994 · Journal of Intelligent Material Systems and Structures

DOI:https://doi.org/10.1177/1045389X9400500306· OSTI ID:53407

Boyd, J G; Lagoudas, D C ^[1]

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1. Texas A&M Univ, College Station, TX (United States)

A micromechanics method based on the Mori-Tanaka averaging scheme is used to predict the effective thermomechanical properties of composite materials reinforced by Shape Memory Alloy (SMA) fibers. Both elastic stiffness changes and transformation strains are taken into account in the constitutive modelling of the SMA fibers. Isothermal longitudinal and transverse stress input and stress-free thermal loading are imposed on the composite, and the composite transformation stress, the maximum transformation strain, and the hysteresis are computed. In contrast to a monolithic SMA, stress-free thermal loading of a shape memory composite is shown to produce transformation strains due to thermal stress induced phase transformation. Closed form solutions for the effective martensite and austenite start temperatures indicate that these temperatures are higher than those of the monolithic SMA material and they depend on the composite processing temperature.

• Sponsoring Organization: USDOE
• OSTI ID: 53407
• Journal Information: Journal of Intelligent Material Systems and Structures, Vol. 5, Issue 3; Other Information: PBD: May 1994
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
PHASE TRANSFORMATIONS
SHAPE MEMORY EFFECT
ELASTICITY
TEMPERATURE DEPENDENCE
THERMAL STRESSES