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业己指出,热应变脆化(HSE)使得焊接接头的安全性降低。因为,当某一缺陷用无损探伤方法探测出来并经过重新焊补时,则一个漏检而又靠近该焊补部位的缺陷的断裂韧性将会由于热应变脆化而降低。为估算与安全性降低相关的某些确定的和慨率的因素,进行可靠性分析是有益的。从这种观点出发,第一篇报告已叙述过所考虑的各种因素、可靠性分析的模型和公式,以及用数字表示的失效事例的慨率。在可靠性分析中,需要研究一些参量对破坏概率的敏感性。该敏感性研究是根据篠塜提出的一次近似二次矩法进行的。这种敏感性的研究是非常有效的。通过敏感性指标的比较可鉴别出哪些参量更重要。本篇报告提供了关于未焊补以及带有或不带有热应变脆化的焊补处破坏概率敏感性研究的各种结果。
It has been pointed out that thermal strain embrittlement (HSE) reduces the safety of welded joints. Because when a flaw is detected by non-destructive flaw detection and after re-welding, then a missing and near the weld repair defects of the fracture toughness will be due to thermal strain embrittlement and decreased. To estimate some of the deterministic and probable factors associated with reduced safety, it is beneficial to conduct a reliability analysis. From this point of view, the first report describes the various factors considered, the models and formulas for reliability analysis, and the rates of failure of numerical examples. In reliability analysis, we need to study the sensitivity of some parameters to the failure probability. This sensitivity study is based on an approximate second moment method proposed by Sho-Hsiao. This sensitivity study is very effective. Through the comparison of sensitivity index can identify which parameters are more important. This report provides various results on the study of the probabilistic sensitivity to failure of welds with and without weld reflow with or without thermal strain embrittlement.