Journal
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
Volume 192, Issue 26-27, Pages 2823-2843Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0045-7825(03)00260-3
Keywords
martensitic phase transitions; relaxation; rank-one convexity; microstructure; sequential lamination; shape-memory alloys; indentation
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We present a practical algorithm for partially relaxing multiwell energy densities such as pertain to materials undergoing martensitic phase transitions. The algorithm is based on sequential lamination, but the evolution of the microstructure during a deformation process is required to satisfy a continuity constraint, in the sense that the new microstructure should be reachable from the preceding one by a combination of branching and pruning operations. All microstructures generated by the algorithm are in static and configurational equilibrium. Owing to the continuity constraint imposed upon the microstructural evolution, the predicted material behavior may be path-dependent and exhibit hysteresis. In cases in which there is a strict separation of micro- and macrostructural lengthscales, the proposed relaxation algorithm may effectively be integrated into macroscopic finite-element calculations at the sub-grid level. We demonstrate this aspect of the algorithm by means of a numerical example concerned with the indentation of a Cu-Al-Ni shape memory alloy by a spherical indenter. (C) 2003 Elsevier B.V. All rights reserved.
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