On the cracks normal to shape memory alloy/elastic material interfaces
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© 2019 Elsevier Ltd Theoretical and numerical analyses are performed to investigate the behavior of a crack propagating perpendicularly to a perfectly bonded bi-material interface. The bi-material system is composed of a linear elastic material in which the interface crack is initially located bonded to a shape memory alloy. Utilizing a continuum thermodynamics-based constitutive model for the shape memory alloys, the effects of different material and operational parameters, such as maximum transformation strain, relative martensitic Young's modulus, and temperature, on the crack propagation behavior and the crack tip transformation zone are explored. Novel closed-form solutions are presented to obtain both the shape of the martensitic transformation zone and the strain energy density around the crack tip. The validity of the theoretical solutions is examined and discussed by comparing to comparable finite element results. The crack propagation behavior is analyzed based on both the critical stress intensity factor and the critical strain energy density criteria. The presented results provide a primary understanding of how the failure mechanism can be controlled in smart composites including SMA components by tuning of the material and operational parameters.
author list (cited authors)
Mirsayar, M. M., & Hartl, D. J.