Hybrid experimental–numerical analysis of basic ductile fracture experiments for sheet metals
Author(s)Dunand, Matthieu; Mohr, Dirk
MetadataShow full item record
A basic ductile fracture testing program is carried out on specimens extracted from TRIP780 steel sheets including tensile specimens with a central hole and circular notches. In addition, equi-biaxial punch tests are performed. The surface strain fields are measured using two- and three-dimensional digital image correlation. Due to the localization of plastic deformation during the testing of the tensile specimens, finite element simulations are performed of each test to obtain the stress and strain histories at the material point where fracture initiates. Error estimates are made based on the differences between the predicted and measured local strains. The results from the testing of tensile specimens with a central hole as well as from punch tests show that equivalent strains of more than 0.8 can be achieved at approximately constant stress triaxialities to fracture of about 0.3 and 0.66, respectively. The error analysis demonstrates that both the equivalent plastic strain and the stress triaxiality are very sensitive to uncertainties in the experimental measurements and the numerical model assumptions. The results from computations with very fine solid element meshes agree well with the experiments when the strain hardening is identified from experiments up to very large strains.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
International Journal of Solids and Structures
Dunand, Matthieu, and Dirk Mohr. “Hybrid Experimental–numerical Analysis of Basic Ductile Fracture Experiments for Sheet Metals.” International Journal of Solids and Structures 47, no. 9 (May 2010): 1130–1143. © 2009 Elsevier Ltd.
Final published version