Gradient-enhanced damage growth modelling of ductile fracture
Journal article, 2021

We present a gradient enhanced damage model for ductile fracture modeling, describing the degraded material response coupled to temperature. Continuum thermodynamics is used to represent components of the energy dissipation as induced by the effective material response, thermal effects and damage evolution. As prototype for the effective material serves the viscoplastic Johnson-Cook constitutive model. The continuum damage evolution of Lemaitre type is focusing the degradation of the shear response eventually leading to ductile shear failure. A novel feature of the paper is the damage driving dissipation rate, allowing for elastic and plastic components separated by a global damage threshold for accumulation of inelastic damage driving energy. In the application to a dynamic split-Hopkinson test and two quasi-static tensile tests, the gradient damage model is compared to the corresponding local model. For isothermal conditions, the examples show that both damage models exhibit mesh convergent behavior when using the global damage threshold.

Author

Ragnar Larsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Ahmet Semih Ertürk

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

International Journal for Numerical Methods in Engineering

0029-5981 (ISSN) 1097-0207 (eISSN)

Vol. in Press

En simuleringsbasead guide för prediktion av skärbarhet

VINNOVA (2016-05397), 2017-09-01 -- 2020-10-30.

Driving Forces

Sustainable development

Subject Categories

Applied Mechanics

Computational Mathematics

Geometry

Areas of Advance

Production

Materials Science

Roots

Basic sciences

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1002/nme.6768

More information

Latest update

7/14/2021