INTERACTION OF TWIN NON-ALIGNED THROUGH-WALL FLAWS UNDER ELASTIC-PLASTIC CONDITIONS

机译：弹性塑料条件下双逆向通孔缺陷的相互作用

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Elastic-plastic calculations have been performed for the geometry containing twin non-aligned through-wall flaws in tension. Such geometries develop localised shear flow fields in which neighbouring flaws interact over much larger separations than currently allowed for in the codes [1-3] under elastic-plastic conditions. J values have been obtained in the annular zone spanning directions directly ahead of the crack, to the geometric angle which connects the two crack tips. It was found that elastic-plastic conditions give rise to a local mixed mode problem, where maximum J values rotate off the plane of the flaw, towards the neighbouring flaws. Interaction factors have been defined by comparing elastic-plastic stress intensity factors for twin flaw configuration with the values for the single flaw. A significant interaction has been observed for geometries with vertical separation less than the length of the flaw (H ＜ L). Interaction based on the ratio of the local to global limit loads has also been examined and shows interaction up to the vertical separations of H=1.5L, largely independent of the horizontal separation.

机译：已经对含有Twin非对齐通壁缺陷的几何形状进行弹性塑料计算。这种几何形状开发局部剪切流场，其中相邻缺陷在弹性塑料条件下的代码[1-3]中的当前允许的分离比当前相互作用。 j在环形区域跨越方向上直接在裂缝前面获得，到连接两个裂纹尖端的几何角度。发现弹性塑料条件导致局部混合模式问题，其中最大J值朝向邻近缺陷旋转缺陷的平面。通过比较双缺陷配置的弹性塑性应力强度因子与单一缺陷的值进行比较来定义相互作用因子。对于垂直分离的几何形状，已经观察到显着的相互作用小于缺陷的长度（H

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《ASME Pressure Vessels and Piping Conference》|2007年||共8页
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B. Bezensek; E. McCulloch; American Society of Mechanical Engineers;
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INTERACTION OF TWIN NON-ALIGNED THROUGH-WALL FLAWS UNDER ELASTIC-PLASTIC CONDITIONS

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