Advances in characterization of sheet metal forming limits
Advances in characterization of sheet metal forming limits
复制标题
金属板材成形极限表征的进展
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Jianping Lin
中科院分区：
文献类型：
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作者：
T. Stoughton;J. Carsley;J. Min;Jianping Lin
为了解释Marciniak试验和Nakajima试验测量的成形极限曲线的差异，本文考虑了非线性应变路径、板材曲率和板材与刀具的接触压力。虽然许多在板材成形行业工作的工程师使用这些测试中的一个或另一个的原始数据时，没有考虑到它们反映了材料性能与这两个测试中涉及的复杂工艺条件的卷积，但本文描述的方法的目标是在没有贯穿厚度压力的情况下，为完全线性应变路径的颈缩开始获得单一的FLC，并仅限于纯面内拉伸条件，该方法被建议用于反映真实的材料性能。使用更严格的测试来检查结果的有效性，在该测试中，非线性、曲率和压力的大小是Nakajima测试的两倍。
This paper accounts for nonlinear strain path, sheet curvature, and sheet-tool contact pressure to explain the differences in measured forming limit curves (FLCs) obtained by Marciniak and Nakajima Tests. While many engineers working in the sheet metal forming industry use the raw data from one or the other of these tests without consideration that they reflect the convolution of material properties with the complex processing conditions involved in these two tests, the method described in this paper has the objective to obtain a single FLC for onset of necking for perfectly linear strain paths in the absence of through-thickness pressure and restricted to purely in-plane stretching conditions, which is proposed to reflect a true material property. The validity of the result is checked using a more severe test in which the magnitude of the nonlinearity, curvature, and pressure are doubled those involved in the Nakajima Test.