Numerical assessment of the dynamic behavior of hybrid shape memory alloy composite

摘要

The phase transformation behavior in hybrid shape memory alloy (SMA) composites under moderate compressive dynamic loads is being investigated. A hybrid SMA composite is described as a morphological or compositional arrangement of an SMA, and one or more passive or active materials. In this study, the hybrid SMA composite under consideration is assumed to be obtained by filling the pores of a porous SMA matrix with a polymeric material. Finite element simulations of a split Hopkinson bar test are performed to assess the effective hybrid SMA composite behavior under compressive strain rates of similar to 10(3) s(-1). The actual mesostructure of the material is incorporated in the analyses by synthesizing statistical information from x-ray computed micro-tomography (XCMT) images and utilizing it in probabilistic algorithms to insert representative pores in finite element meshes. A parametric study based on the volume fraction of pores and epoxy material is carried out for hybrid epoxy-SMA composite and plain porous SMA, respectively, and a comparison is performed.