Implicit–Explicit Integration of Gradient-Enhanced Damage Models
Publication: Journal of Engineering Mechanics
Volume 145, Issue 7
Abstract
Quasi-brittle materials exhibit strain softening. Their modeling requires regularized constitutive formulations to avoid instabilities on the material level. A commonly used model is the implicit gradient-enhanced damage model. For complex geometries, it still shows structural instabilities when integrated with classical backward Euler schemes. An alternative is the implicit–explicit (IMPL-EX) integration scheme. It consists of the extrapolation of internal variables followed by an implicit calculation of the solution fields. The solution procedure for the nonlinear gradient-enhanced damage model is thus transformed into a sequence of problems that are algorithmically linear in every time step. Therefore, they require one single Newton–Raphson iteration per time step to converge. This provides both additional robustness and computational acceleration. The introduced extrapolation error is controlled by adaptive time-stepping schemes. This paper introduced and assessed two novel classes of error control schemes that provide further performance improvements. In a three-dimensional compression test for a mesoscale model of concrete, the presented scheme was about 40 times faster than an adaptive backward Euler time integration.
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Acknowledgments
The research was supported by the Federal Institute for Materials Research and Testing, Berlin and by the German Research Foundation (DFG) under project Un224/7-1. Additionally, the research leading to these results received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement No. 320815 [ERC Advanced Grant Project “Advanced tools for computational design of engineering materials” (COMP-DES-MAT)].
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©2019 American Society of Civil Engineers.
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Received: May 10, 2018
Accepted: Oct 30, 2018
Published online: Apr 24, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 24, 2019
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