LENGTHSCALE, ORIENTATION AND MORPHOLOGY EFFECTS IN FATIGUE CRACK NUCLEATION IN POLYCRYSTALS

摘要：

A crystal plasticity model for near-alpha hcp titanium alloys embodying a quasi-cleavage failure mechanism is presented and employed to investigate the conditions necessary in order for facet nucleation to occur in cold-dwell fatigue.A model polycrystal is used to investigate the effects of combinations of crystallographic orientations,lengthscale effects,and the essential role of (cold) creep during hold periods in the loading cycle.Direct comparisons of model predictions are made with dwell fatigue test results.The crystal model for faceting is found to be consistent with a range of experimental observations.

作者: F.P.E.Dunne D.Rugg

作者单位: Department of Engineering Science,Oxford University,Parks Road,Oxford OX1 3P J,England Rolls-Royce plc,Derby

会议类型: 国际会议

会议名称: 第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)

会议地点: 安徽黄山

会议语种:英文

页码: 145-152

在线出版日期: 2008-06-03（万方平台首次上网日期，不代表论文的发表时间）