The weld metal compared to the base metal, is known to be more vulnerable to cracking. Thus, the strength mismatch limit load analysis is necessary for defect assessment. In our previous paper, closed-form solutions of mis-match limit loads were proposed for idealized butt weld configuration as a function of the strength mis-match ratio with geometry-related slenderness parameter. The actual weld geometry is not idealized band configuration but shape of V-grooved welds. The surface crack is more common and significant than through wall crack. The present work provides mis-match limit loads for circumferential surface cracked pipes in the centre of V-groove welds using finite element (FE) analysis. Various crack depth (a/t=0.35～0.8) and groove angles (20°～90°) are considered for systematic investigation. With regards to loading conditions, axial tension is applied for all cases.
展开▼
机译：已知与母材相比，焊接金属更容易开裂。因此，强度失配极限载荷分析对于缺陷评估是必要的。在我们以前的论文中，提出了理想配合焊缝配置的不匹配极限载荷的闭式解决方案，该解决方案是强度不匹配率与几何相关的细长参数的函数。实际的焊缝几何形状不是理想的带状配置，而是V型槽焊缝的形状。表面裂缝比壁裂缝更普遍和显着。本工作使用有限元（FE）分析为V型槽焊缝中心的圆周表面裂纹管提供了不匹配的极限载荷。考虑各种裂纹深度（a / t = 0.35〜0.8）和槽角（20°〜90°）进行系统研究。关于负载条件，在所有情况下均施加轴向张力。
展开▼
