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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.1: Codes and Standards >INTERACTION OF TWIN NON-ALIGNED THROUGH-WALL FLAWS UNDER ELASTIC-PLASTIC CONDITIONS
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INTERACTION OF TWIN NON-ALIGNED THROUGH-WALL FLAWS UNDER ELASTIC-PLASTIC CONDITIONS

机译：弹塑性条件下双非对准穿墙缺陷的相互作用

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摘要

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：已经对包含两个张力未对准的贯穿壁缺陷的几何形状进行了弹塑性计算。这样的几何形状形成了局部剪切流场，在该剪切流场中，相邻的缺陷在弹塑性条件下以比规范[1-3]当前允许的更大的间距相互作用。在沿裂纹正前方的环形区域中，获得了将两个裂纹尖端连接起来的几何角度的J值。已发现，弹塑性条件会引起局部混合模式问题，其中最大J值会从缺陷平面朝着相邻的缺陷旋转。通过将双缺陷构造的弹塑性应力强度因子与单缺陷的值进行比较，可以定义相互作用因子。对于垂直间距小于缺陷长度（H ＜L）的几何形状，观察到了显着的相互作用。还已经研究了基于局部极限载荷与全局极限载荷之比的相互作用，并且显示了直到H = 1.5L的垂直间距为止的相互作用，而在很大程度上与水平间距无关。

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