A ductile fracture model based on continuum thermodynamics and damage
Journal article, 2019

The paper presents an approach to ductile failure modeling derived based on continuum thermodynamics and damage. A continuum damage enhanced formulation of the effective material is used to describe the degradation of the response. From the thermo-mechanically motivated dissipation rate, a novel damage driving energy that involves both stored energy and dissipative contributions due to inelasticity is presented. This damage driving energy is combined with a damage threshold that controls the onset of inelastic damage driving dissipation. The damage evolution law is formulated as a balance of produced dissipation and produced fracture area induced dissipation, involving damage progression velocity and length-scale parameters without any non-local gradient term. As main prototypes for the effective material and damage threshold, the Johnson–Cook continuum and failure models are exploited. From the verification examples, satisfactory convergence properties of the model are obtained. The model capabilities to represent real thermodynamic ductile failure processes are demonstrated for a specimen made of a ductile Weldox steel subjected to tensile split-Hopkinson Tension Bar tests. The model is computationally efficient and shows well controlled damage progression in the FE-application.

Johnson-Cook

Damage driving energy

Ductile fracture

Continuum damage

Author

SENAD RAZANICA

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Ragnar Larsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Lennart Josefson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Mechanics of Materials

0167-6636 (ISSN)

Vol. 139 Dec 103197

Driving Forces

Sustainable development

Subject Categories

Applied Mechanics

Areas of Advance

Production

Materials Science

Roots

Basic sciences

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

DOI

10.1016/j.mechmat.2019.103197

More information

Latest update

11/11/2019