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未焊透是工程实际焊接结构中最为常见的一种焊接不连续 ,如何更科学合理地简化未焊透工程 ,以便于对其进行的断裂分析是工程界和学术界所一直关心的问题。文中从未焊透根部形貌照片中选择了几种常见的根部形貌 ,并通过一定程度的形状简化后 ,得到五种典型的规则根部形状的缺口。在此基础上文中采用弹塑性有限元方法 ,以缺口根部几何形状尺寸作为参数进行有限元计算 ,得到一系列J -Lr 曲线。通过分析这些曲线 ,发现在缺口长度或深度相同条件下 ,影响J积分值大小的主要因素是缺口宽度或缺口根部曲率半径及根部的形状 ,并最终得到具有最大J积分值的缺口根部形貌系平端形状。从而可以采用这种根部形貌来保守地计算未焊透的J积分值 ,实现未焊透J积分值工程计算的简化。
Impermeability is the most common kind of welding discontinuity in the actual welding structure. How to simplify the non-penetration engineering more scientifically and reasonably so that the fracture analysis can be carried out is always a concern of engineering and academia. In this article, several common root topographs have been selected from the root-free pictures of the solderable root, and five typical root notch shapes have been obtained after a certain degree of shape simplification. Based on this, the finite element method is used in this paper to calculate the geometry of the notched root as a parameter, and a series of JLr curves are obtained. By analyzing these curves, it is found that the main factors affecting the J integral value under the same notch length or depth are the notch width or notch root radius of curvature and root shape, and finally the notch root topography with the largest J integral value Flat end shape. Therefore, this root topography can be used to conservatively calculate the J-integral without penetration and simplify the engineering calculation of J-integral without penetration.