Focus: To characterize the thermomechanical response of shape memory alloys (SMAs) and to develop and implement
three-dimensional, phenomenological constitutive models to predict the response of engineering applications that incorporate SMAs.
Thermomechanical experiments are performed on dogbone specimens (e.g., NiTi) to obtain the material properties of the shape memory
alloys. The material properties are used as input to the constitutive models that have been developed.
The models are implemented in a user material subroutine (UMAT) in ABAQUS and used to analyze engineering
applications which incorporate SMAs.
One such application is that of the Boeing Variable Geometry Chevron (VGC), which features SMAs mounted on a composite substrate
to reduce noise during takeoff and landing as well as drag during cruise.