Comparison of Gigacycle Fatigue Behavior of Cast Aluminum in Tension and Torsion Loading

摘要：

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

关键词： torsion fatigue vhcf 20khz cast aluminum 2-assu3g-y3s

作者: Hongqian XUE Jieying WU C.Bathias

作者单位: School of Mechanical Electronic, Northwestern Polytechnical University, Xian 710072 China College of Energy and Power Engineering, Nanjing University of Aeronautics and astronautics, Nanjing Paris X University, 50, Rue de Sevres 92410 Ville Davray France

会议类型: 国际会议

会议名称: The 3rd International Symposium on Jet Propulsion and Power Engineering(第三届喷气推进与动力工程国际会议 ISJPPE)

会议地点: 南京

会议语种:英文

页码: 442-446

在线出版日期: 2010-09-13（万方平台首次上网日期，不代表论文的发表时间）