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Probability characterization of tensile strength of an aluminum casting

机译：铝铸件抗拉强度的概率表征

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The paper statistically studies fracture properties of an aluminum low-pressure die casting component on basis of 32 tensile tests on round bar specimens. It reveals that the probability distribution of both ultimate tensile strength and fracture strain can be described using either the Weibull or the Gaussian function. Goodness-of-fit tests based on the Anderson-Darling statistic fail to reject either of them. However, the extrapolation of the distribution of the fracture strain to a probability level of 0.01% gives an unrealistic low or even negative lower-bound value. This suggests that a pass of the goodness-of-fit tests is not sufficient for identifying a physically reasonable probability distribution. At the same time, three different methods for determining the tensile fracture strain are compared: the area reduction of the fracture surface, the critical elongation of the gauge section, and the combined experimental-numerical analysis. The first one gives the most reasonable estimate. It is also found that the ultimate tensile strength linearly correlates with the projected area of pores.
机译：本文基于32条圆棒试样的拉伸试验，对铝低压压铸件的断裂性能进行了统计研究。结果表明，既可以使用威布尔函数也可以使用高斯函数描述极限抗拉强度和断裂应变的概率分布。基于Anderson-Darling统计量的拟合优度检验无法拒绝其中任何一个。但是，将断裂应变的分布外推至0.01％的概率水平将得出不切实际的低值甚至负下限值。这表明通过拟合优度检验不足以识别物理上合理的概率分布。同时，比较了确定拉伸断裂应变的三种不同方法：断裂表面的面积减小，应变计截面的临界伸长率以及组合的实验-数值分析。第一个给出最合理的估计。还发现极限抗拉强度与孔的投影面积线性相关。

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