期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 184, 期 1-3, 页码 272-287出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2006.11.031
关键词
fracture; true stress-strain curve; true stress triaxiality; Bridgeman correction
Material ductility, or the failure strain, is generally characterized by simple tensile tests. However, tensile tests on sheet samples lead to higher strain gradients than those observed in axisymmetric samples, so the classical Bridgeman correction is invalid. This paper first describes how to correctly calculate local values of stress the triaxiality in tensile deformed sheet samples. Secondly, the ductility of sheet samples was also simulated numerically by a damage mechanics cell model based on the finite element method. Finally, an experimental study on two Al 6xxx sheet alloys shows that the classical, average ductility (ln(A(r)/A(0)) congruent to 0.67 here) strongly underestimates the true maximum material ductility, i.e. the local maximum strain to failure epsilon(f) congruent to 0.91. The values of the average ductility predicted by the present work are also shown to agree well with the experimental values. (c) 2006 Elsevier B.V. All rights reserved.
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