Plastic anisotropy is a common property of many metallic materials. This property affects many aspects of structural analysis and design. In contrast to the isotropic case, there is a great variety of yield criteria proposed for anisotropic materials. Moreover, even if one specific yield criterion is selected, several constitutive parameters are involved in it. Therefore, parametric analysis of structures made of anisotropic materials is quite cumbersome. The present paper demonstrates the effect of the constitutive parameters involved in Hill’s quadratic yield criterion on the upper bound limit load for weld stretched overmatched tension specimens containing a crack of arbitrary shape, assuming that the crack is located inside the weld. Different sets of the constitutive parameters are involved in the yield criteria for weld and base materials. Since the limit load is an input parameter of many flaw assessment procedures, the final result of the present paper shows that it is necessary to take into account plastic anisotropy in these procedures. It is worthy of note that the limit load is involved in the flaw assessment procedures in combination with the stress and strain fields near the tip of a crack. In anisotropic materials, these fields may become non-symmetric even under symmetric loading. This behavior affects the propagation of cracks.

中文翻译：

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塑性各向异性对超匹配裂纹拉伸试样极限载荷的影响

塑性各向异性是许多金属材料的共同特性。此属性影响结构分析和设计的许多方面。与各向同性情况相反，针对各向异性材料提出了多种屈服标准。此外，即使选择了一个特定的屈服准则，其中也涉及几个本构参数。因此，对由各向异性材料制成的结构进行参数分析非常繁琐。假设裂纹位于焊缝内部，本文演示了 Hill 二次屈服准则中涉及的本构参数对包含任意形状裂纹的焊缝拉伸过匹配拉伸试样的上限载荷的影响。焊缝和母材的屈服标准涉及不同的本构参数集。由于极限载荷是许多缺陷评估程序的输入参数，本文的最终结果表明在这些程序中考虑塑性各向异性是必要的。值得注意的是，极限载荷与裂纹尖端附近的应力和应变场结合用于缺陷评估程序。在各向异性材料中，即使在对称载荷下，这些场也可能变得不对称。这种行为会影响裂纹的扩展。值得注意的是，极限载荷与裂纹尖端附近的应力和应变场结合用于缺陷评估程序。在各向异性材料中，即使在对称载荷下，这些场也可能变得不对称。这种行为会影响裂纹的扩展。值得注意的是，极限载荷与裂纹尖端附近的应力和应变场结合用于缺陷评估程序。在各向异性材料中，即使在对称载荷下，这些场也可能变得不对称。这种行为会影响裂纹的扩展。