The effect of plasticity on damage evolution using a relaxation-based material model

authored by: S. Schwarz, K. Hackl, Philipp Junker
Abstract: As damage occurs in the context of high stresses that are also related to the presence of plastic strains, it is natural to investigate the effect of plasticity on damage evolution and to thus achieve a more realistic model. In this work, the existing and new damage model presented in [Junker P, Schwarz S, Makowski J, Hackl K. Continuum Mech. Therm. 2017, 29 (1), 291–310] is enhanced with plasticity and isotropic hardening. The damage model is based on a relaxation-based approach and does not require additional complex regularization techniques besides considering viscous effects. The benefit of the model are mesh-independent results for the rate-dependent case, even without considering, e.g. gradient terms for mathematical regularization. The enhancement with plasticity and isotropic hardening was investigated for a representative volume element that considerd a damaging matrix material and non-damaging hard precipitates. Two different loading types, pure tension and pure shear, yielded the homogenized stress/strain response for the material at various loading rates. Hereto, several finite discretizations in terms of finite-element meshes were used. The results underline the mesh-independence for physically reasonable loading rates and viscosities.
External Organisation(s): Ruhr-Universität Bochum
Type: Article
Journal: Journal of the Mechanical Behavior of Materials
Volume: 27
ISSN: 2191-0243
Publication date: 14.12.2018
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Materials Science (miscellaneous), Mechanics of Materials
Electronic version(s): https://doi.org/10.1515/jmbm-2018-2001 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{2acaf2e6d5aa41f1a9c4b3e03ed54f01,
title = "The effect of plasticity on damage evolution using a relaxation-based material model",
abstract = "As damage occurs in the context of high stresses that are also related to the presence of plastic strains, it is natural to investigate the effect of plasticity on damage evolution and to thus achieve a more realistic model. In this work, the existing and new damage model presented in [Junker P, Schwarz S, Makowski J, Hackl K. Continuum Mech. Therm. 2017, 29 (1), 291–310] is enhanced with plasticity and isotropic hardening. The damage model is based on a relaxation-based approach and does not require additional complex regularization techniques besides considering viscous effects. The benefit of the model are mesh-independent results for the rate-dependent case, even without considering, e.g. gradient terms for mathematical regularization. The enhancement with plasticity and isotropic hardening was investigated for a representative volume element that considerd a damaging matrix material and non-damaging hard precipitates. Two different loading types, pure tension and pure shear, yielded the homogenized stress/strain response for the material at various loading rates. Hereto, several finite discretizations in terms of finite-element meshes were used. The results underline the mesh-independence for physically reasonable loading rates and viscosities.",
keywords = "damage, finite-element-method, isotropic hardening, mesh-independent, plasticity, rate-dependent, regularization, relaxation-based, viscosity",
author = "S. Schwarz and K. Hackl and Philipp Junker",
year = "2018",
month = dec,
day = "14",
doi = "10.1515/jmbm-2018-2001",
language = "English",
volume = "27",
journal = "Journal of the Mechanical Behavior of Materials",
issn = "2191-0243",
publisher = "Walter de Gruyter GmbH",
number = "5-6",
}