Thermomechanical cyclic behavior modeling of Cu-Al-Be SMA materials and structures |
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Authors: | Luc Saint-Sulpice Shabnam Arbab-Chirani Sylvain Calloch |
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Institution: | 1. Université Européenne de Bretagne, Laboratoire Brestois de Mécanique et des Systèmes (EA 4325), France;2. École Nationale d’Ingénieurs de Brest, Technopôle Brest-Iroise, CS 73862, 29238 Brest Cedex 3, France;3. École Nationale Supérieure des Ingénieurs des Études et Techniques d’Armement, 2 rue François Verny, 29806 Brest Cedex 9, France |
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Abstract: | This paper concerns the behavior of Cu-Al-Be polycrystalline shape memory alloys under cyclic thermomechanical loadings. Sometimes, as shown by many experimental observations, a permanent inelastic strain occurs and increases with the number of cycles. A series of cyclic thermomechanical tests has been carried out and the origin of the residual strain has been identified as residual martensite. These observations have been used to develop a 3D macroscopic model for the superelasticity and stress assisted memory effect of SMAs able to describe the evolution of permanent inelastic strain during cycles. The model has been implemented in a finite elements code and used to simulate the behavior of antagonistic actuators based on SMA springs under cyclic thermomechanical loading with a residual displacement appearance. |
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