A pragmatic orthotropic elasticity-based damage model with spatially distributed properties applied to short glass-fibre reinforced polymers

[摘要] This article presents a simple progressive damage model for quasi-brittle materials, combining orthotropic elasticity with a scalar damage model including spatial variation of the damage initiation strain and the crack band method for softening regularization. The model's performance is first analyzed from a numerical point of view and then demonstrated for tensile tests (0 degrees, 45 degrees and 90 degrees), open-hole tensile tests (0 degrees) and three-point bending (0 degrees and 90 degrees) tests of short fibre-reinforced polypropylene with 15 wt.% and 30 wt.% glass fibres. Despite its simplicity, the model captures the anisotropic elastic and inelastic behaviour observed in experiments. The model is applicable for orthotropic brittle or quasi-brittle materials, where the variability in elastic properties is negligible and the orientation dependency of the fracture strain is small or not relevant for the application. (C) 2021 The Author(s). Published by Elsevier Ltd.

[发布日期] 2021-11-01

[关键词] Anisotropic elasticity;Damage mechanics;Heterogeneous material properties;Finite element analysis;Strength