文献类型：期刊文章

作　　者：薛红前[1] 吴铁鹰[2] Bathias C[3]

机构地区：[1]西北工业大学机电学院 [2]南京航空航天大学能源与动力学院 [3]法国巴黎第十大学能源与动力实验室

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》

基　　金：Supported by the National Natural Science Foundation of China(50775182);the Scientific Research Foundation for the Returned Scholars of the Ministry of Education of China~~

年　　份：2011

卷　　号：28

期　　号：1

起止页码：32-37

语　　种：中文

收录情况：AJ、CSA、CSA-PROQEUST、EI、IC、INSPEC、JST、SCOPUS、ZGKJHX、ZMATH、普通刊

摘　　要：An improved understanding of fatigue behavior of a cast aluminum alloy（2-AS5U3G-Y35）in very high cycle regime is developed through the ultrasonic fatigue test in axial and torsion loading.The new developed torsion fatigue system is presented.The effects of loading condition and frequency on the very high cycle fatigue（VHCF）are investigated.The cyclic loading in axial and torsion at 35 Hz and 20 kHz with stress ratio R=-1 is used respectively to demonstrate the effect of loading condition.S-N curves show that the fatigue failure occurs in the range of 105—1010 cycles in axial or torsion loading and the asymptote of S-N curve is inclined,but no fatigue limit exists under the torsion and axial loading condition.The fatigue fracture surface shows that the fatigue crack initiates from the specimen surface subjected to the cyclic torsion loading.It is different from the fatigue fracture characteristic in axial loading in which fatigue crack initiates from subsurface defect in very high cycle regime.The fatigue initiation is on the maximum shear plane,the overall crack orientation is on a typical spiral 45° to the fracture plane and it is the maximum principle stress plane.The clear shear strip in the torsion fatigue fracture surface shows that the torsion fracture is the shear fracture.

关 键 词：fatigue testing  torsion fatigue  very high cycle fatigue（VHCF）  torsion loading  cast aluminum  

分 类 号：TG146.21[材料类] O346.2]