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Probabilistic Simulation Approach for Holistic Life of Aluminum Alloy 2B06 Based on Material Microstructure

TAN Xiaoming,ZHANG Danfeng,CHEN Yueliang* Qingdao Branch,Naval Aeronautical Engineering Academy,Qingdao 266041,China  
A quantitative metallographic analysis and fatigue fractographic analysis using respectively KH-7700 microscope and scanning electron microscope reveals that the fatigue crack initiation mechanism depends heavily on material microstructure for aluminum alloy 2B06.The fatigue crack initiates generally from S-type(Al2CuMg) constituent particles for the smooth rolled sheet specimens.Through statistic analysis,the cumulative distribution functions of the width and length of S-type constituent particles are obtained.The constituent particles are assumed to be surface cracks,and a holistic life simulation approach is proposed using probabilistic fracture mechanics based on material microstructure for 2B06,which includes short crack growth life and long crack growth life.A considerable number of fatigue tests with different maximum stress levels and different stress ratios are carried out to validate the approach,which shows that this approach is valid and feasible.
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