Structural Numerical Simulations on Shape Memory Alloys Based Actuators

This research represents a significant advance in the application of shape memory alloy (SMA) materials in engineering applications, mainly in the field of actuators. The study proposes a comprehensive study of the thermomechanical behavior of SMA materials and implements their peculiar properties by implementing a user material subroutine (UMAT). The UMAT demonstrates high predictive accuracy and has been validated in simulating the behavior of SMA spring within the complex system of an actuator. This verification provides the framework for the design of customized components, as demonstrated by the bistable actuator, proposing alternative solutions for improving the efficiency of this type of actuator compared to its traditional counterparts. Furthermore, the paper includes numerical analyses of a patented bistable actuator, providing justifications for its geometric characteristics. The integration of additive technology and advanced materials addresses the challenges of temperature considerations, leading to innovative solutions. The actuator's stability, responsiveness to various electrical loads, and practical applicability underline the success of combining these cutting-edge technologies.