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Analysis of Local Fracture Strain and Damage Limit of Advanced High Strength Steels using Measured Displacement Fields and FEM

N. Ma1,2, K. Sato3, K. Takada4

Osaka University, Osaka, Japan.
JSOL Corporation, Osaka, Japan.
JFE Steel Corporation, Hiroshima, Japan.
Honda R&D Co. Ltd, Tochigi, Japan.

Computers, Materials & Continua 2015, 46(3), 195-219. https://doi.org/10.3970/cmc.2015.046.195

Abstract

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.

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Cite This Article

N. . Ma, K. . Sato and K. . Takada, "Analysis of local fracture strain and damage limit of advanced high strength steels using measured displacement fields and fem," Computers, Materials & Continua, vol. 46, no.3, pp. 195–219, 2015.



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