This test method will define procedures for thermomechanical cycling of shape memory alloys (SMA) material and components with circular cross-sections under constant torque. This method will measure the transformation properties such as transformation temperatures, actuation shear strain and residual shear strain, when a shape memory alloy is thermally cycled through the phase transformation under a constant applied torque. This test is done to provide data for the characterization selection of shape memory alloy materials, quality control, design allowables and actuator design.
shape memory alloy; actuator; torsion; thermomechanical cycle
While there exists a broad range of potential applications for Shape Memory Alloy (SMA)actuators, their transition to production is hindered by a lack of accepted industry and regulatory testing and certification standard. In addition to the recently published ASTM standards (E3097 andE3098) that describe test methods to evaluate actuator and shape memory effect properties under unaxial loads, test methods for torsional thermomechanical cycling are needed. End users, suppliers, and researchers need a standardized method for torsional SMA components to evaluate actuation properties of new and existing materials, quality control, and to develop design allowables.
The title and scope are in draft form and are under development within this ASTM Committee.
Developed by Subcommittee: E08.05
Staff Manager: Brian Milewski
Date Initiated: 11-06-2020
Technical Contact: Douglas Nicholson