Material Characterization of SMA Actuators Under Nonproportional Thermomechanical Loading

Journal of Engineering Materials and Technology - Tập 121 Số 1 - Trang 75-85 - 1999
Zhonghe Bo1, Dimitris C. Lagoudas1, David A. Miller1
1Center for Mechanics of Composites, Aerospace Engineering Department, Texas A&M University, College Station, TX 77843

Tóm tắt

The application of SMA actuators in smart structures usually involves thermally induced phase transformation with a variable applied stress in SMA actuators, resulting in thermomechanical nonproportional loading of SMAs in stress-temperature space. To investigate the constitutive response of SMAs under thermomechanical nonproportional loading, experiments for thermally induced phase transformation of binary NiTi SMA wires loaded by an elastic linear spring are performed in the Active Materials Laboratory at Texas A&M University. A constitutive model developed by Bo and Lagoudas (1998a, b, c) and Lagoudas and Bo (1998) is used as the basis for the theoretical prediction of the response of SMA line actuators loaded by springs with different elastic constants. Model predictions are compared with experimental results.

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