The effect of friction compensation on the slope of flow curves obtained by stack compression tests

Martin L. Kölüs
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Abstract

Abstract. Knowing the large strain flow curve is essential for many simulation processes in the sheet metal forming technology. A prominent example is the clinching, when the strains are one magnitude higher than in tension, but a simple deep-drawing process could also lead to appropriately large strains. To obtain the flow stress - plastic strain curves beyond the range of tension, several processes are known. In the most multi-axial cases, a conversion factor based on the work equivalence is usually applied on the measurement results to obtain the equivalent quantities. However, at compressive experiments, the friction and the geometrical issues may distort the curve shape even further, hiding the real material behavior. In this study we investigate the effect of the friction determination method and the value of the friction coefficient on the curve shape. Pressure dependent and constant friction coefficients were inversely specified by disk compression tests and related finite element modeling. In possession of the friction values, the conversions of the physically measured compressive stress to equivalent flow stress during disk and stack compression tests with different height-diameter ratios are discussed here.
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摩擦补偿对堆叠压缩试验获得的流动曲线斜率的影响
摘要了解大应变流动曲线对于金属板材成形技术中的许多模拟过程至关重要。一个突出的例子是夹紧,此时的应变比拉伸时高一个量级,但简单的深拉工艺也可能导致适当的大应变。要获得超出拉伸范围的流动应力-塑性应变曲线,有几种已知的工艺。在大多数多轴情况下,通常在测量结果上应用基于功当量的转换系数,以获得等效量。然而,在压缩实验中,摩擦和几何问题可能会进一步扭曲曲线形状,从而掩盖真实的材料行为。在本研究中,我们研究了摩擦力测定方法和摩擦系数值对曲线形状的影响。通过圆盘压缩试验和相关的有限元建模,反向确定了与压力相关的摩擦系数和恒定摩擦系数。在拥有摩擦值的情况下,本文讨论了在不同高度-直径比的圆盘和堆叠压缩试验中,将物理测量的压缩应力转换为等效流动应力的问题。
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