Abstract A novel modified ligament yield criterion to calculate the residual strength for aluminum alloy panels with Multiple Site Damage (MSD) is proposed. Different from the conventional ligament yield criterion the novel method is based on modifying the plastic zone of the crack tip. The microdefects can be represented by the coefficient of plastic zone determined after the material processing. Then modified plastic zone size is much closer to that of the fracture. The residual strength tests are performed on plate specimens in 7075-T651 aluminum alloy sheet with MSD. Furthermore, we also verify the availability and capability of the modified method with public literature. The predicted residual strengths are within 3% averagely of the corresponding test results, much more accurate in comparison with other methods.

中文翻译：

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一种改进的基于 MSD 的铝合金板残余强度预测方法

摘要 提出了一种新的修正韧带屈服准则，用于计算多点损伤（MSD）铝合金板的残余强度。不同于传统的韧带屈服准则，新方法基于修改裂纹尖端的塑性区。微缺陷可以用材料加工后确定的塑性区系数来表示。然后修改后的塑性区尺寸更接近断裂的尺寸。残余强度测试是在 7075-T651 铝合金板材上用 MSD 进行的。此外，我们还通过公开文献验证了修改后方法的可用性和能力。预测的残余强度与相应的测试结果平均在 3% 以内，与其他方法相比更加准确。