Journal of the Japan Society for Technology of Plasticity
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
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Combination of Displacement Field Measurement and FEM for Analysis of Local Strains, Stresses and Damage Limit of High-Strength Steel Sheets
Ninshu MAKentaro SATOKenji TAKADA
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JOURNALS OPEN ACCESS

2016 Volume 57 Issue 662 Pages 252-257

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Abstract

In the present work, we combined a measuring method, the digital image grid method (DIGM), with the finite-element method (FEM) to analyze local strains, local stresses and the damage limit. We called the method displacement-measurement-based FEM (M-FEM). Transient displacement fields during a uniaxial tensile test were directly measured by DIGM. With the aid of M-FEM, detailed distributions of local strains and local stresses in large deformation zones were investigated. Then, the change in the local anisotropic parameter of high-strength steel sheets with plastic strain from uniform deformation to fracture was evaluated. Furthermore, the local fracture strain and damage limit of several advanced high strength steel sheets (980MPa with t1.2mm, 980MPa with t1.6mm, 1180MPa with t1.6mm) were identified by uniaxial tensile tests and M-FEM. The identified damage limit of materials agreed very well with that measured by a conventional press test. This verified the validity of M-FEM.

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© 2016 The Japan Society for Technology of Plasticity
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