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11 July 2002 Image-based dynamic modeling of phase transformation in hybrid SMA
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The main interest of this study is to investigate phase transformation behavior in hybrid SMA under moderate dynamic loads. A hybrid SMA is described as a two-component composite made of dense SMA matrix with pores, and a passive or active material that fills the pores. The dynamic behavior of hybrid SMA under strain rates of 1000 /s is investigated by incorporating the porous mesostructure in the finite element analysis. X-ray computed micro tomography (XCMT) images are employed to synthesize statistical information and probabilistic algorithms are utilized in obtaining suitable representative finite element meshes. The effective constitutive response of hybrid SMA is obtained by simulating the split Hopkinson bar test of the finite element specimen. A parametric study based on volume fraction of the filler material is carried out. A comparison of hybrid SMA and porous SMA is also performed.
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Muhammad A. Qidwai and Virginia G. DeGiorgi "Image-based dynamic modeling of phase transformation in hybrid SMA", Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002);

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