2026-04-17T00:43:40Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1857522026-02-01T02:04:45Zcom_2072_1033col_2072_452950

urn:hdl:2117/185752 Implicit–explicit integration of gradient-enhanced damage models Titscher, Thomas Oliver Olivella, Xavier Unger, Jörg F. Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures Àrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits Àrees temàtiques de la UPC::Enginyeria dels materials Fracture mechanics--Mathematical models Implicit explicit schemes Gradient-enhanced damage model Adaptive time stepping Continuum damage Robustness COMP-DES-MAT Project COMPDESMAT Project Mecànica de fractura -- Models matemàtics This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://ascelibrary.org/doi/10.1061/%28ASCE%29EM.1943-7889.0001608. 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. The research was supported by the Federal Institute for Materials Research and Testing, Berlin, Germany and by the German Research Foundation (DFG) under project Un224/7-1. Additionally, the research leading to these results has received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013) / ERC Grant Agreement n. 320815 (ERC Advanced Grant Project "Advanced tools for computational design of engineering materials" COMP-DES-MAT). Peer Reviewed Postprint (author's final draft) 2019-07 Article https://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0001608 info:eu-repo/grantAgreement/EC/FP7/320815/EU/Advanced tools for computational design of engineering materials/COMP-DES-MAT Open Access American Society of Civil Engineers