作　　者： ; ;

机构地区： 中国工程物理研究院结构力学研究所

出　　处： 《压力容器》 2003年第12期8-11,共4页

摘　　要： 压力容器的焊缝金属和热影响区存在的各种缺陷将导致结构疲劳强度下降 ,采用无损检测技术定量获得焊接缺陷的参量具有随机性和模糊性的特征。因此 ,以模糊集理论为基础 ,考虑焊接缺陷的类型、大小、位置、相互间影响、缺陷数量、焊接条件对焊缝疲劳强度的综合影响 ,建立焊缝缺陷疲劳强度二级模糊综合评估模型。根据不同缺陷对疲劳强度损伤的贡献关系合理确定权数和隶属度 ,利用实例分析了焊缝存在缺陷情况下疲劳强度的定量值的计算方法。 Fatigue strength of structure will descend because there are many weld defect of WM and HAZ in pressure vessels. Weld defect parameters acquired with NDT has stoachastic and fuzzy.Therefore,based on the theory of fuzzy set ,and thinking of the type,size,postion,interaction, quantity of weld defect and weld term that effect fatigue strength, the model of the two—step fuzzy comprehensive evaluation for fatigue strength of WM and HAZ was presented . According to relation between weld defect and fatigue strength damage,Weight and membership function were obtained. One example for computing fatigue strength of defect in WM and HAZ was introduced.

关 键 词： 焊缝金属 压力容器 模糊分析 疲劳强度 热影响区

领　　域： [机械工程] [金属学及工艺]