Experimental Study and Numerical Simulation on Fatigue Crack Growth Behavior of GH4133B Superalloy

摘要：

　　The fatigue crack growth tests for GH4133B superalloy are carried out at room temperature.The stress intensity factor ranges and the fatigue crack growth rates at various stress ratios are tested,and the corresponding threshold stress intensity factor ranges are measured.Using the Paris formula,the experiment data of fatigue crack growth are analyzed.It is shown that the fatigue crack growth rate increasing with increasing stress intensity factor range and stress ratio,and a modified Paris formula considering threshold stress intensity factor range can well describe the fatigue crack growth behavior.The fracture surface morphologies are investigated using a scanning electron microscope.It is shown that in the crack initiation region,steady growth region and rapid growth region,the fracture surface exhibits a cleavage fracture mode,fatigue striations and an intergranular fracture mode,respectively.Finally,the von Mises stresses and stress intensity factors at the crack tip of specimen of GH4133B superalloy at various external loads and crack lengths are simulated using the finite element method,and the threshold stress intensity factors under different maximal external loads at a certain crack length are calculated.The comparison between test and simulation indicates that the stress intensity factors at the crack tip calculated by the finite element method agree well with experimental data.

关键词： fatigue crack growth stress intensity factor stress ratio GH4133B superalloy

作者: Zhao Rongguo Li Xiujuan Jiang Yongzhou Luo Xiyan Li Junfei Li Hongchao Tan Dunhou

作者单位: College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China Department of Aviation Theory,Air Force Aviation University,Changchun 130022,China College of Resources & Environmental Science,Chongqing University,Chongqing 401331,China

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 980-988

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）