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《应用数学和力学(英文版)》 2015-09
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Revised damage evolution equation for high cycle fatigue life prediction of aluminum alloy LC4 under uniaxial loading

Zhixin ZHAN;Weiping HU;Miao ZHANG;Qingchun MENG;Institute of Solid Mechanics, School of Aeronautics Science and Engineering,BeiHang University;China Academy of Space Technology;  
The fatigue life prediction for components is a difficult task since many factors can affect the final fatigue life. Based on the damage evolution equation of Lemaitre and Desmorat, a revised two-scale damage evolution equation for high cycle fatigue is presented according to the experimental data, in which factors such as the stress amplitude and mean stress are taken into account. Then, a method is proposed to obtain the material parameters of the revised equation from the present fatigue experimental data.Finally, with the utilization of the ANSYS parametric design language(APDL) on the ANSYS platform, the coupling effect between the fatigue damage of materials and the stress distribution in structures is taken into account, and the fatigue life of specimens is predicted. The outcome shows that the numerical prediction is in accord with the experimental results, indicating that the revised two-scale damage evolution model can be well applied for the high cycle fatigue life prediction under uniaxial loading.
【CateGory Index】: TG146.21
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