单轴拉伸颈缩过程中变形和应力的演变

IF 3.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
C. Liu
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引用次数: 0

摘要

在本研究中,我们通过实验研究了单轴拉伸下金属薄板颈缩过程中变形和应力的演变。使用数字图像相关(DIC)的光学技术获得样品表面上的变形,该技术绘制出二维(2D)域上的全场位移。与测量变形相关的应力场是使用刘[18]开发的技术确定的,其中,如果变形材料保持各向同性,则可以通过求解平衡方程和适当的牵引边界条件,基于测量变形来计算应力。变形测量表明,在颈部开始后,颈部外部区域的变形被冻结,证实了Bridgman[2]的推测,并且颈部区域内的变形继续增加,直到最终失效。变形永远不会逆转,因此,颈缩区中的所有材料颗粒都只经历软化,而不会卸载。结果还揭示了颈缩区应力场的一些独特而有趣的模式。讨论了它们对颈缩过程分析和建模的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolution of deformation and stress during necking in uniaxial tension

In this investigation, we study experimentally the evolution of both the deformation and the stress during the necking process of a thin metal sheet subject to uniaxial tension. The deformation over the sample surface is obtained using the optical technique of Digital Image Correlation (DIC), which maps out full-field displacement over a two-dimensional (2D) domain. The stress field associated with the measured deformation is determined using the technique developed by Liu [18], where if the deforming material remains isotropic, the stresses can be computed based on the measured deformation by solving the equation of equilibrium together with appropriate traction boundary conditions. The deformation measurement indicates that after the initiation of the neck the deformation in areas outside the neck is frozen, confirming what Bridgman [2] has speculated, and the deformation within the neck area continues to increase till final failure. There is never a reversal in deformation and, as a result, all material particles in the necking zone only experience softening but not unloading. The results also reveal some unique and interesting patterns of the stress field over the necking zone. Their implications on the analysis and modeling of the necking process are discussed.

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来源期刊
Forces in mechanics
Forces in mechanics Mechanics of Materials
CiteScore
3.50
自引率
0.00%
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审稿时长
52 days
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