剪应力加载金属薄板的皱纹测定

J.P.G. Magrinho, J.A.O. Santos, M.B. Silva
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引用次数: 0

摘要

钣金成形中的轻量化理念要求降低厚度和几何形状的复杂性。这种组合极大地促进了起皱的发生,而起皱是工具制造商必须考虑的主要失效模式之一。金属板材起皱测定研究通常考虑的是圆柱杯凸缘和圆锥区域的起皱。与涉及剪应力状态的圆柱形杯深冲相比,复杂几何形状的载荷更为多样。在这种情况下,本研究提出了在铝合金剪切加载的实验金属板试样中应用两种不同的皱纹测定方法。其中一种方法涉及引发起皱的几何参数,另一种方法以物理为基础,考虑平面内小应变及其应变率的演变。可成形性实验测试需要专用夹具,使其运动学与拉伸测试类似。实验结果可以确定引发起皱的应力状态,并确定临界应变,从而绘制出板材的起皱极限曲线。
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Wrinkling Determination in Sheet Metal Loaded by Shear Stresses
Lightweight concept approach in sheet metal forming requires, among others, thickness reduction and geometry complexity. This combination dramatically promotes the wrinkling occurrence, which can be considered as one of main failure mode that toolmakers must consider. The sheet metal wrinkling determination research usually considers the wrinkling in flange and conical area of a cylindrical cup. For complex geometries the loadings are more diverse than in the deep drawing of a cylindrical cup involving shear stress states. In this context, the present work proposes the application of two different wrinkling determination methodologies in an experimental sheet metal specimen loaded by shear in an aluminum alloy. One of the methodologies involves geometrical parameters to trigger the onset of wrinkling and the other methodology is physically based and considers the evolutions of the in-plane minor strain and its strain rate. The experimental formability test requires a dedicated clamping apparatus to allow its kinematics to be similar to a tensile test. Results allowed the identification of the stress state that triggered the wrinkling occurrence, and the determination of the critical strains that allow plotting the wrinkling limit curve of the sheet material.
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