| 10CrNiMo结构钢悬臂弯曲加载低周疲劳表面裂纹的扩展特性 |
| |
| 引用本文： | 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, 0(6): 9-12 |
| |
| 作者姓名： | 张亚军 高灵清 张利娟 |
| |
| 作者单位： | 洛阳船舶材料研究所 |
| |
| 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。
|
| 关 键 词： | 10CrNiMo结构钢 悬臂弯曲加载 低周疲劳 表面裂纹 扩展特性 |
Propagation Characteristics of Low Cycle Fatigue Surface Crack of 10CrNiMo Structural Steel during Cantilever Bend Loading Process |
| |
| 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 Mechanical Engineering, 2012, 0(6): 9-12 |
| |
| Authors: | ZHANG Ya-jun GAO Ling-qing ZHANG Li-juan |
| |
| Affiliation: | (Luoyang Ship Material Research Institute,Luoyang 471039,China) |
| |
| 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. |
| |
| Keywords: | 10CrNiMo structural steel cantilever bend loading low cycle fatigue surface crack propagation characteristic |
| 本文献已被 CNKI 等数据库收录！ |
|
