Validation of the ductile fracture modeling of CGI at quasi-static loading conditions
Journal article, 2021

Fracture modeling and experimental validation of Compacted Graphite Iron (CGI) specimens loaded under quasi-static conditions at room temperature are considered. Continuum damage mechanics coupled to plasticity is adopted to describe the evolution of damage. The damage production is based on a recently developed rate dependent damage evolution law, where the damage–plasticity coupling is modeled based on a damage driving energy that involves both stored energy and plasticity contributions. To describe ductile fracture accounting for stress triaxiality on the damage initiation, the inelastic contribution to the damage driving energy is controlled by the Johnson-Cook failure criterion. Three different damage models are defined based on elastic/inelastic damage driving energies. The damage models are validated against experiments on a set of notched specimens made of CGI with different notch geometries, where the global forcedisplacement curves and corresponding strain fields are obtained using digital image correlation technology. It is shown from the testing and the simulations that plastic strains generally need to be accounted for in order to properly describe the different failure processes of the CGI specimens. In addition, the ductile damage model is shown to more accurately predict the experimental force-displacement response as compared to the more simplistic stress drop, element deletion technique.

Author

SENAD RAZANICA

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Lennart Josefson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Ragnar Larsson

Chalmers, Industrial and Materials Science, Material and Computational Mechanics

Torsten Sjögren

RISE Research Institutes of Sweden

International Journal of Damage Mechanics

1056-7895 (ISSN) 1530-7921 (eISSN)

Vol. In Press

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

10.1177/1056789521997545

More information

Latest update

5/20/2021