Characteristics of crack interior initiation and early growth originated from inclusion for very-high-cycle fatigue of high strength steels | |
Hong YS(洪友士); Lei ZQ(雷铮强); Sun CQ(孙成奇); Zhao AG(赵爱国) | |
会议录名称 | Proceedings of the 4th International Conference on CRACK PATHS (CP 2012) Gaeta (Italy), 9 – 21 September, 2012 |
2012-09 | |
会议名称 | The 4th International Conference on “Crack Paths” (CP 2012) |
会议日期 | 2012-09-09~09-21 |
会议地点 | Gaeta, Italy |
摘要 |
Fatigue tests on a high carbon chromium steel were performed with rotating bending and ultrasonic fatigue tests. The fractography was examined to reveal that fatigue cracks initiated at specimen interior for very-high-cycle fatigue (VHCF) with fish-eye pattern embracing fine-granular-area (FGA) morphology originated from inclusions. The measurements show the dimensions of FGA and fish-eye as a function of the applied stress and fatigue failure cycles. The results also show the values of stress intensity factor range at FGA (ΔKFGA) and fish-eye (ΔKfisheye) almost keep constant with failure cycles, and the values of ΔKFGA are close to the relevant fatigue threshold (ΔKth).
The fatigue life from FGA to fish-eye and from fish-eye to the critical crack size is respectively calculated, thus to estimate the fatigue life contributed by FGA. Moreover, the crack growth rate within FGA was estimated. The present result is combined with our previous ones and with those available in literature to discuss the process of crack initiation and early growth for VHCF, which is responsible for a majority part of total fatigue life. In addition, the large scattering of fatigue life was investigated, which was ascribed to the distribution of inclusion size. ; |
课题组名称 | LNM金属材料微结构与力学性能 |
语种 | 英语 |
文献类型 | 会议论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/52731 |
专题 | 非线性力学国家重点实验室 |
推荐引用方式 GB/T 7714 | Hong YS,Lei ZQ,Sun CQ,et al. Characteristics of crack interior initiation and early growth originated from inclusion for very-high-cycle fatigue of high strength steels[C]Proceedings of the 4th International Conference on CRACK PATHS (CP 2012) Gaeta (Italy), 9 – 21 September, 2012,2012. |
条目包含的文件 | 下载所有文件 | |||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
CP931.pdf(405KB) | 会议论文 | 开放获取 | CC BY-ND | 浏览 下载 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论