A Multiscale Analysis on the Superelasticity Behavior of Architected Shape Memory Alloy Materials

Area of Science:

• Materials Science
• Mechanical Engineering
• Computational Mechanics

Background:

• Shape memory alloys (SMAs) exhibit unique superelasticity and hysteresis effects.
• Architected materials offer tailored properties through controlled microstructures.
• Understanding the multiscale behavior of architected SMAs is crucial for advanced applications.

Purpose of the Study:

• To investigate the superelasticity effects in architected shape memory alloys (SMAs) using a multiscale approach.
• To establish relationships between void fraction, stiffness, hysteresis, and mass at the cellular level.
• To analyze the structural responses of architected SMAs at the macroscopic level.

Main Methods:

• Parametric analysis of representative volume elements (RVEs) at the cellular level.
• Modeling superelasticity using a thermomechanical constitutive model (Chemisky et al., 2011).
• Multilevel finite element method (FE²) to couple RVE and structural level responses.

Main Results:

• Architected SMA structures inherit cellular-level superelasticity and hysteresis.
• Void fraction significantly influences the stiffness and hysteresis of SMA structures.
• The multiscale approach effectively links microscopic material behavior to macroscopic structural response.

Conclusions:

• The multiscale approach provides a direct method to assess the impact of microstructural design (void fraction) on SMA structural performance.
• This research offers a framework for optimizing stiffness, hysteresis, and mass in architected SMA structures.
• The findings support the development of advanced SMA components for various engineering applications.