It is an effective and new method to evaluate the structural fatigue reliability by probabilistic fracture mechanics approach ( pfma ) 这是应用于结构疲劳安全性评估中的一种科学合理的新方法。
The theory of probabilistic fracture mechanics is presented . then the general rule and influential factors of cracks propagation occurred in fatigue failure are discussed 介绍了概率断裂力学的理论基础,及疲劳破坏过程中裂纹扩展的一般规律,以及影响疲劳裂纹扩展的因素。
Finally , applying probabilistic fracture mechanics approach ( pfma ) , the reliability analysis is carried out for helicopter metal material ( aluminum alloy ) structure having initial cracks 最后,应用概率断裂力学方法( pfma ) ,对含初始裂纹体的直升机金属材料(铝合金)构件的疲劳裂纹扩展寿命进行可靠性分析。
However , the fatigue of structure is such a complicated phenomenon affected by many uncertainties that it is necessary to analyze the structural fatigue from the point of probability and statistics . probabilistic fracture mechanics is a branch of fracture mechanics , so the various parameters affecting the fatigue propagationg a re considered as randomized 作为断裂力学的一个新的分支,概率断裂力学从概率和统计的角度对结构进行疲劳可靠性分析,充分考虑了疲劳破坏过程中出现的不确定因素,将影响疲劳裂纹扩展速率的各参数看作是服从某一种概率分布的随机变量。