| GCr15钢超长寿命疲劳破坏的机理 |
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| 引用本文： | 李伟,李强,鲁连涛,王平.GCr15钢超长寿命疲劳破坏的机理[J].机械工程材料,2009,33(5). |
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| 作者姓名： | 李伟 李强 鲁连涛 王平 |
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| 作者单位： | 李伟,李强,LI Wei,LI Qiang(北京交通大学机械与电子控制工程学院,北京,100044);鲁连涛,LU Lian-tao(西南交通大学牵引动力国家重点实验室,四川成都,610031);王平,WANG Ping(山东省科学院海洋仪器仪表研究所,山东青岛,266001)
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| 基金项目： | 国家重点基础研究发展规划(973计划) |
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| 摘 要： | 通过对试样断口的观察、断裂力学分析以及FRASTA仿真的方法,研究了GCr15钢在旋转弯曲加载下超长寿命疲劳破坏的机理,阐述了其内部裂纹萌生和扩展的力学条件,建立了颗粒状白色区域(GBF)的形成机理模型.结果表明:GCr15钢的内部破坏是由材料内部的非金属夹杂物引起的,并且在夹杂物的周围伴有GBF的形成,整个内部裂纹具有典型的"鱼眼"形貌特征;内部起裂是超长寿命疲劳破坏的典型特征.GBF的应力强度因子幅值△KG瓯(4～6 MPa·m1/2)是控制内部裂纹扩展的临界参数,并且其形成过程占据了超长寿命疲劳过程的绝大部分.
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| 关 键 词： | GCr15钢超长寿命疲劳 裂纹 应力强度因子幅值 |
Fracture Mechanism of GCr15 Steel in Very High Cycle Fatigue |
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| LI Wei,LI Qiang,LU Lian-tao,WANG Ping.Fracture Mechanism of GCr15 Steel in Very High Cycle Fatigue[J].Materials For Mechanical Engineering,2009,33(5). |
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| Authors: | LI Wei LI Qiang LU Lian-tao WANG Ping |
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| Affiliation: | LI Wei1,LI Qiang1,LU Lian-tao2,WANG Ping3(1.Beijing Jiaotong University,Beijing 100044,China,2.State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,3.Shandong Academy of Sciences,Qingdao 266001,China) |
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| Abstract: | Fracture mechanism of GCr15 steel in very high cycle fatigue was studied in rotating bending.Based on the observation of fracture surface,the analysis of fracture mechanics and the simulation with FRASTA method,the initiation and propagation mechanisms of interior cracks were explained and the model of granular bright facet(GBF) formation mechanism was proposed.The test results show that the interior fracture of GCr15 steel was induced by the nonmetallic inclusion in the subsurface of material,the GBF was f... |
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| Keywords: | GCr15 steel very high cycle fatigue crack stress intensity factor range |
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