It is an effective and new method to evaluate the structural fatigue reliability by probabilistic fracture mechanics approach ( pfma ) 這是應(yīng)用于結(jié)構(gòu)疲勞安全性評估中的一種科學(xué)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 介紹了概率斷裂力學(xué)的理論基礎(chǔ),及疲勞破壞過程中裂紋擴展的一般規(guī)律,以及影響疲勞裂紋擴展的因素。
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,應(yīng)用概率斷裂力學(xué)方法( pfma ) ,對含初始裂紋體的直升機金屬材料(鋁合金)構(gòu)件的疲勞裂紋擴展壽命進行可靠性分析。
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 作為斷裂力學(xué)的一個新的分支,概率斷裂力學(xué)從概率和統(tǒng)計的角度對結(jié)構(gòu)進行疲勞可靠性分析,充分考慮了疲勞破壞過程中出現(xiàn)的不確定因素,將影響疲勞裂紋擴展速率的各參數(shù)看作是服從某一種概率分布的隨機變量。