期刊
OPTICS AND LASERS IN ENGINEERING
卷 45, 期 1, 页码 153-159出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2006.03.002
关键词
Moire patterns; ESPI; nondestructive testing; out-of-plane displacements; strain localization
类别
We have used both electronic speckle-pattern interferometry (ESPI) and whole-field Subtractive Moire (WSM) to follow the thickness reduction of sheet metal specimens subjected to uniaxial tensile tests. By analyzing the out-of-plane displacements induced between close load stages, we evaluated nonlinear effects linked to the progression of the thickness necking or transverse reduction in area of the sample. We observed that, during the transition zone of the test, long before reaching instability, the samples were thinned mainly along a relatively broad band. Due to its remarkable degree of localization, we identified this band as the diffuse necking. This diffuse necking preceded the development of the local neck and indicated the beginning of shear band formation. (C) 2006 Elsevier Ltd. All rights reserved.
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