基于MIDAS NFX和AFGROW的既损构件疲劳寿命分析

Fatigue life analysis of damaged components based on MIDAS NFX and AFGROW

断裂力学广泛应用于航空航天、核、造船、汽车制造、结构工程等领域。本文利用MIDASNFX和AFGROW分析了有缺口的构件。在MIDAS NFX中,通过不同的疲劳荷载函数可以获得缺口构件的疲劳寿命,在组装后可以得到近似的S-N函数。本文采用了MIDAS NFX对缺口构件进行分析,然后在AFGROW中定义了相同的荷载和材料特性。将MIDAS NFX归一化应力导入AFGROW当中,从而预测裂纹扩展寿命。

Fracture mechanics is widely used in aerospace,nuclear,shipbuilding,vehicle manufacturing,structural engineering and other fields.In this paper,Midas NFX and AFGROW are used to analyze notched specimens.In Midas NFX,the fatigue life of notched specimens can be obtained by different fatigue load functions,and the approximate S-N function can be obtained after assembling.In the two software,through the analysis of Midas NFX notch samples,the same load and material characteristics are defined in AFGROW.Then the normalized stress is introduced into the stress intensity coefficient column of AFGROW to predict the crack propagation life.