Finite-element-simulations of polycrystalline shape memory alloys

Shape memory alloys (SMA) are widely employed as sensors and actuators. The need for precise control requires reliable modeling techniques involving, e.g., prescribed stresses and temperatures. These parameters are always inherently coupled in SMA. Various models are in use to characterize the non-linear hysteretic behavior of SMA; among them some that do not provide a means to incorporate true thermomechanical coupling. This aspect is, however, featured by the MAS-model developed by Mueller, Achenbach and Seelecke which is strictly based on thermodynamics. It captures all the salient characteristics of SMA and has already proven its suitability for simulating SMA behavior. The present report portrays preliminary results on the verification of the current implementation of said model in a finiteelement-program and its applicability, gives a brief account of the numerical approach and provides an outlook on upcoming work.