含焊接缺陷构件的疲劳可靠性评定

Fatigue reliability evaluation for welding construction containing welding defects

在试验的基础上,应用模糊集理论,综合评定了焊接缺陷对于构件疲劳强度的影响,综合考虑了缺陷种类、大小、位置、缺陷间的相互干涉四个因素,得出了一个评定焊接缺陷对构件疲劳强度危害程度的特征参量μ(X)。将特征参量μ(X)与质量带理论结合,做出了含缺陷构件的μ-S-N-P图。运用μ-S-N-P图,初步解决了构件中已知缺陷形态如何进行构件的可靠性评定等工程上关心的问题。特征参量μ(X)与作者提出的主疲劳源模型相符合。

On the basis of the experiment,a synthesized evaluation of welding defects to fatigue strength of welding construction is made by fuzzy sets theory.The evaluation takes into account the interrelations among the category,dimension,location and the interaction of defects.Accordingly,a characteristic parameter μ(X) is proposed to evaluate the fatigue strength of welding construction containing defects.Combining this characteristic parameter μ(X) with the quality zone theory,a μ-S-N-P pattern is developed.The problems concerned by engineers such as how to calculate the reliability of welding construction containing defects can be solved when the status of defects is known.The characteristic parameter μ(X)coincides with the proposed primary fatigue source model.