On the Layered Medium with Elastic and Shape Memory Alloy Plies under Various Loading Rates

Abstract

The behavior of a layered structure composed of shape memory alloy (SMA) and elastic plies is investigated in the present paper. We study two modes of deformation: simple compression and simple contraction. We obtain distribution fields of state parameters (temperature, martensitic phase fraction) in the layered structure for several rates of stress controlled loading. The study is motivated by possible practical application of SMA alloys in isolation mounts. The effectiveness of the SMA material operation in these applications essentially depends on internal dissipation in the material itself. It appears that the mode of material operation in the structure is important. First we recall constitutive equations of so called RL model of SMA materials, stipulated to be valid in the pseudoelastic range of their behavior. We formulate the relevant coupled thermo-mechanical problems for the studied modes of deformation. We solved the problems by using elaborated by the author computer code procedures being an implementation of constitutive relations into finite element code. The analysis delivers insight into SMA alloy operation in different strain states. The study of SMA alloy ply behavior may be helpful when analyzing the behavior of damping elements like washers, active control elements or cladding made of NiTi in a flow machinery.KeywordsShape Memory AlloyFinite Element CodeNiTi AlloyCavitation ErosionSimple CompressionThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.