On the transformation behavior of functionally graded SMA composites subjected to thermal loading

Shape Memory Alloy (SMA) composites are being used in an ever-expanding set of applications. For new applications, Functionally Graded (FG) SMA composites are being developed incorporating a wide variety of matrices. An analytical methodology combining averaging technique of composites and an SMA constitutive model is developed to determine the transformation properties of the FG–SMA composite. The results obtained from the analyses of such a composite show that after transformation the stress in the SMA composite is lower than in the case of pure elastic composite under the same thermal loading. This decrease in stress can result in an increase in temperature resistance and improved mechanical properties of SMA composites. This work will be explored through a parametric study to understand their influence on SMA composites design.

► The transformation properties of the FG–SMA composite are determined. ► The constitutive model of the FG–SMA composite is developed. ► The averaging technique of composites and an SMA constitutive model are combined. ► Results show that stress in the FG–SMA composite is lower than the pure elastic case.