| ANISOTROPY EFFECT ON THE FRACTURE MODEL OF DP980 SHEETS CONSIDERING THE LOADING PATH |
| N. PARK1, H. HUH2, J. B. NAM3, C. G. JUNG3 |
1KAIST
2Korea Advanced Institute of Science & Technology
3POSCO |
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| ABSTRACT |
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This paper is concerned with the anisotropy effect of DP980 sheets on the fracture model considering the variation of the loading path. For better application of a material, it is essential to understand its plastic behavior to predict the onset of the fracture in metals accurately. Especially in sheet metal forming, the anisotropy effect on the fracture strain should be taken into account to consider the fracture behavior more properly. In order to construct the fracture model, three different types of tests were carried out to obtain the facture strain from uniaxial tensile tests with classic dog-bone specimens, pure shear specimens and plane strain grooved specimens using Instron 5583. Each specimen was made along three different orientations: the angle of 0o(RD); 45o(DD); 90o(TD) with respect to the rolling direction of sheet metals to evaluate the anisotropy effect on the fracture strain. Strains were measured using the two-dimensional digital image correlation (2D-DIC) method. In order to consider the influence of anisotropy on the fracture strain accurately, the Hill |
| Key Words:
Anisotropy, A modified Lou–Huh ductile fracture model, Fracture locus, Damage accumulation, Fracture forming limit diagram (FFLD) |
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