A modified residual strength prediction method for aluminum alloy plates with MSD

A modified residual strength prediction method for aluminum alloy plates with MSD
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改进的MSD铝合金板残余强度预测方法

DOI:
10.1016/j.mechrescom.2020.103584
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发表时间:
2020-10
影响因子:
2.4
通讯作者:
Xie Wei
Xie Wei
中科院分区:
工程技术4区
文献类型:
--
作者:
Xu Zhimin;Xie Wei

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提出了一种计算多部位损伤铝合金板残余强度的修正韧带屈服准则。与传统的韧带屈服判据不同,该方法基于对裂纹尖端塑性区的修正。微缺陷可以用材料加工后确定的塑性区系数来表示。修正塑性区尺寸更接近断口的塑性区尺寸。对加MSD的7075-T651铝合金薄板试样进行了残余强度试验。此外,我们还用公开文献验证了改进方法的有效性和能力。预测的残余强度与相应试验结果的平均误差在3%以内,比其他方法准确得多。
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.
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