同种材质焊接接头弯曲试验特性分析

弯曲试验是评定焊接接头焊接质量的常用手段，但对于如何选择恰当的弯曲直径，不同标准存在较大差异. 文中首先推导了焊接接头弯曲伸长率计算理论公式，并对焊接接头进行了有限元分析，验证了理论公式的正确性；进一步根据分析结果对理论公式进行了修正，分别得出了两种弯曲方法下最小弯曲直径的计算公式；然后对不同规格焊接接头进行了实际的弯曲试验，验证了计算公式的正确性；最后将公式计算结果与中国船级社标准进行了对比，结果表明，船级社推荐的弯曲直径更接近三点弯曲时的计算结果，但当弯曲直径较小时，建议采用辊筒弯曲方法.

Analysis of bending test characteristics of welded joints with same material

Bending test can be used to assess the quality of welded joints, however, there are great differences in the different standards about how to select the proper bending diameter for the bending test. In this paper, firstly, the theoretical formula for bending elongation of the welded joint under ideal conditions is deduced, and the finite element method is used to analyze mechanical properties of the welded joint, and the correctness of the theoretical formula is verified. Further, the theoretical formula is modified according to the analysis results, and the formula for minimum bending diameter under the two bending methods is established respectively. Then the new formula is verified by carrying real bending test on welded joints of different specifications. Finally, calculation result of the formula for minimum bending diameter are compared with the standard of Chinese Classification Society. The results showed that the bending diameter recommended by the Chinese Classification Society is closer to the calculation result of three point bending, but when the bending diameter is small, it is more recommended to use the roller bending method.