Abstract

The novel idea of embedding multiple memory by locally augmentation of transformation properties have enhanced the functionality of shape memory alloys with respect to traditional SMAs posing only a single set of transformation properties. However, it is necessary to model the behavior of such kind of multiple-memory SMAs in order to study their response, when used in smart structures. A computational method based on finite element analysis is presented in this paper to simulate the multiple-memory behavior. This method can be applied in investigation of various designed 1D multiple-memory structures under general thermomechanical loadings and boundary conditions. To evaluate the model, a series of case studies under constant temperature, constant stress, and constant strain are carried out using the numerical approach. To verify the model, first, 3 multiple stress plateau wires are modeled using the numerical technique, and the FE results are compared with existing experimental data, showing an acceptable agreement. Then, the model is applied in simulating a functionally graded SMA, and the results are closely validated with the experimental ones. At last, a proposed multiple-memory actuator is studied and its actuation response is explained in detail under thermomechanical loadings.

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