Abstract Damage evolution in two types of shear-dominant quasi-statically loaded specimens, with a single spherical pore embedded at their mid-gauge section, is analyzed numerically. The evolving damage in those geometrically identical specimens is characterized using the Gurson-Tvergaard-Needleman (GTN) model accounting for nucleation and growth of porosity, and its extension for shear deformations following Nahshon and Hutchinson (GTN-NH). We show that under shear-compression (SCS), the dominant damage mechanism in the pore surroundings consists of voids nucleation, followed by high shear deformations that increase the NH damage component. On the other hand, in the case of shear-tension (STS), damage accumulation by shear deformations (i.e. NH extension) appears to be negligible compared to the mechanism of void growth. A correlation is shown between the fracture surface of a test specimen and the numerical results shown here. It is suggested that the shear-compression-specimen (SCS) might be a good candidate for the calibration of the Nahshon-Hutchinson term as it was found to dominate over the growth component.

中文翻译：

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准静态剪切主导压缩和拉伸试样中嵌入孔周围的损伤演化

摘要 数值分析了两种以剪切为主的准静态载荷试样的损伤演化，在它们的中截面处嵌入了单个球形孔。使用 Gurson-Tvergaard-Needleman (GTN) 模型表征那些几何相同的试样中不断演变的损伤，该模型考虑了孔隙度的成核和增长，以及其在 Nahshon 和 Hutchinson (GTN-NH) 之后剪切变形的扩展。我们表明，在剪切压缩 (SCS) 下，孔隙环境中的主要损伤机制包括空隙成核，然后是增加 NH 损伤分量的高剪切变形。另一方面，在剪切张力 (STS) 的情况下，与空隙增长机制相比，剪切变形（即 NH 延伸）造成的损伤累积似乎可以忽略不计。试样的断裂面与此处所示的数值结果之间显示了相关性。建议剪切压缩试样 (SCS) 可能是校准 Nahshon-Hutchinson 项的良好候选者，因为它被发现在生长分量上占主导地位。