10CrNiMo结构钢悬臂弯曲加载低周疲劳表面裂纹的扩展特性
Propagation Characteristics of Low Cycle Fatigue Surface Crack of 10CrNiMo Structural Steel during Cantilever Bend Loading Process
摘 要
通过COD位移规控制悬臂弯曲加载试样表面裂纹前缘的应变, 采用逐级递增应变的试验方法, 研究了10CrNiMo结构钢的低周疲劳表面裂纹的扩展特性, 并用扫描电镜对断口形貌进行了观察。结果表明: 表面裂纹扩展速率与裂纹前缘总应变范围之间满足良好的幂律关系; 裂纹源附近出现轮胎花样, 裂纹扩展初期挤压严重, 扩展中期发现较多的二次裂纹, 扩展后期疲劳辉纹清晰可见, 最后断裂区具有典型的韧窝; 裂纹按照锐化-钝化机制扩展, 最后断裂模式为韧性断裂。
悬臂弯曲加载
低周疲劳
表面裂纹
扩展特性
10CrNiMo structural steel
cantilever bend loading
low cycle fatigue
surface crack
propagation characteristic
Abstract
The strain of surface crack front of cantilever bend loaded sample was controlled by COD displacement gage, the propagation characteristics of low cycle fatigue surface crack of 10CrNiMo structural steel were studied by increasing the strain gradually, and the fracture morphology was observed by scanning electron microscopy. The results show that the surface crack propagation rate had good power ruler relation with the total strain range for crack front. Some tyre-figure appeared near the crack source, serious squeezing happened at the beginning stage of crack propagation, major secondary cracks were found at the middle stage of crack propagation, the fatigue striation was obvious at the late stage of crack propagation, and typical dimples were found on the last fracture area.The crack propagated in sharpening-blunting mechanism and fractured in toughness mode finally.
中图分类号 TG115.5
所属栏目 试验研究
基金项目
收稿日期 2011/5/18
修改稿日期 2011/12/24
网络出版日期
作者单位点击查看
备注张亚军(1972-), 男, 河南新乡人, 高级工程师, 硕士。
引用该论文: ZHANG Ya-jun,GAO Ling-qing,ZHANG Li-juan. Propagation Characteristics of Low Cycle Fatigue Surface Crack of 10CrNiMo Structural Steel during Cantilever Bend Loading Process[J]. Materials for mechancial engineering, 2012, 36(6): 9～12
张亚军,高灵清,张利娟. 10CrNiMo结构钢悬臂弯曲加载低周疲劳表面裂纹的扩展特性[J]. 机械工程材料, 2012, 36(6): 9～12
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】段权, 程光旭, 姜培正. 16MnR低周疲劳裂纹萌生寿命的统计分布研究[J].材料工程, 2000, 17(1): 42-46.
【2】陈泳, 张京海, 李晓泉.800 MPa级别钢熔敷金属热处理脆化机理研究[J].材料开发与应用, 2008, 23(6): 33-37.
【3】陈传尧.疲劳与断裂[M].武汉: 华中科技大学出版社, 2002.
【4】NEWMAN J C, RAJU I S. An empirical stress-intensity factor equation for the surface crack[J].Engineering Fracture Mechanics, 1981, 15(1/2): 185-192.
【5】舰船材料编辑室.大型焊接结构用材料的低周疲劳裂纹扩展抗力[C]//断裂力学在造船工程上的应用.[S.l.]: [s.n], 1975: 100-121.
【6】张亚军, 梁健, 张欣耀, 等.一种悬臂弯曲加载表面裂纹扩展试样及其应用[J].中国测试, 2009, 35(1): 94-96.
【7】石德珂, 金志浩.材料力学性能[M].西安: 西安交通大学出版社, 2008.
【8】张栋, 钟培道, 陶春虎.机械失效的实用分析[M].北京: 国防工业出版社, 1997.
【2】陈泳, 张京海, 李晓泉.800 MPa级别钢熔敷金属热处理脆化机理研究[J].材料开发与应用, 2008, 23(6): 33-37.
【3】陈传尧.疲劳与断裂[M].武汉: 华中科技大学出版社, 2002.
【4】NEWMAN J C, RAJU I S. An empirical stress-intensity factor equation for the surface crack[J].Engineering Fracture Mechanics, 1981, 15(1/2): 185-192.
【5】舰船材料编辑室.大型焊接结构用材料的低周疲劳裂纹扩展抗力[C]//断裂力学在造船工程上的应用.[S.l.]: [s.n], 1975: 100-121.
【6】张亚军, 梁健, 张欣耀, 等.一种悬臂弯曲加载表面裂纹扩展试样及其应用[J].中国测试, 2009, 35(1): 94-96.
【7】石德珂, 金志浩.材料力学性能[M].西安: 西安交通大学出版社, 2008.
【8】张栋, 钟培道, 陶春虎.机械失效的实用分析[M].北京: 国防工业出版社, 1997.
相关信息
