高级检索
    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): 37-40.
    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): 37-40.
    shu
    LI Wei, LI Qiang, LU Lian-tao, WANG Ping. Fracture Mechanism of GCr15 Steel in Very High Cycle Fatigue[J]. Materials and Mechanical Engineering, 2009, 33(5): 37-40.
    Citation: LI Wei, LI Qiang, LU Lian-tao, WANG Ping. Fracture Mechanism of GCr15 Steel in Very High Cycle Fatigue[J]. Materials and Mechanical Engineering, 2009, 33(5): 37-40.
    shu

    GCr15钢超长寿命疲劳破坏的机理

    Fracture Mechanism of GCr15 Steel in Very High Cycle Fatigue

      摘要
    • 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ΔKGBF(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.

       

      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 formed in the vicinity around the inclusion,and the entire interior crack exhibited typical appearance characteristic of “fish-eye”.The interior crack was the typical characteristic of very high cycle fatigue failure.The stress intensity factor range ΔKGBF about 4-6 MPa·m1/2 was the critical parameter of controlling interior crack propagation.The majority of the very high fatigue life was possessed by the formation progress of GBF.

       

      • HTML全文
      • 参考文献(11)
      • 相关文章
      • 施引文献
    • 资源附件(0)

    /

    返回文章
    返回