TY  - EJOU
AU  - Ma, N.  
AU  - Sato, K.  
AU  - Takada, K.  

TI  - Analysis of Local Fracture Strain and Damage Limit of Advanced High Strength Steels using Measured Displacement Fields and FEM
T2  - Computers, Materials \& Continua

PY  - 2015
VL  - 46
IS  - 3
SN  - 1546-2226

AB  - The local mechanical behaviors of advanced high strength steels undergoing a very large strain from uniform plastic deformation to fracture were investigated with the aid of a measured displacement field and a measurement based FEM. As a measurement method, a digital image grid method (DIGM) was developed and the three-direction transient displacement field on uniaxial tensile test pieces was measured. Combining the measured transient displacement field with the finite element method, a measurement based FEM (M-FEM) was developed for the computation of distribution of the local strains, local stresses and ductile damage accumulation in a tensile test piece. Furthermore, the local fracture strain and damage limit of several advanced high strength steel sheets (980MPa/t1.2mm, 980MPa/t1.6mm, 1180MPa/t1.6mm) were identified by uniaxial tensile tests and the measurement based FEM. The identified damage limit of materials agreed very well compared with that measured by a conventional press test, and the validity of the measuring method and measurement based FEM was verified.
KW  - Digital image grid method
KW  -  Measured displacement field
KW  -  Measurement based FEM
KW  -  Local fracture strain
KW  -  Damage limit
KW  -  Advanced high strength steels

DO  - 10.3970/cmc.2015.046.195