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| Research on stress intensity factors of surface crack of hollow axles at different depth |
| Received:August 06, 2008 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20104023 |
| KeyWord:hollow axle surface crack stress intensity factor finite element |
| Author | Institution |
| 周素霞 |
北京建筑工程学院机电与汽车工程学院,北京 |
| 张俊清 |
北京交通大学 轨道车辆结构可靠性与运用检测技术教育部工程研究中心,北京 |
| 谢基龙 |
北京交通大学 轨道车辆结构可靠性与运用检测技术教育部工程研究中心,北京 |
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| Abstract: |
| Stress intensity factors(SIFs) of circumferential semi-ellipse crack at the external surface of hollow axles subjected to rotary bending loading are researched using a 3D finite element model. The 3D finite element analysis is carried out by employing quarter-point 20-node isoparametric degenerate singular elements to obtain the stress intensity factors along the crack front. The semi-ellipse crack configuration are defined with two parameters: the aspect ratio a／b (a, b=ellipse semi-axes), the relative depth a／t(t, the thickness of the hollow axle’s wall). An analysis about the influence of the rotary angles and crack depth on SIFs is presented at the surface and the center points of the crack front. It is shown that the stress intensity factors at the same relative position along the crack front change significantly under a loading cycle for a given crack. Moreover, the maximum values of the stress intensity factors at different locations appear at different rotary angles. So the crack propagation at the surface points are asymmetry. The results will help to research propagation path and life of the surface crack of hollow axles. |
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