| 断裂力学法研究多轴疲劳裂纹扩展的速度 |
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| 引用本文： | 于强.断裂力学法研究多轴疲劳裂纹扩展的速度[J].四川理工学院学报(自然科学版),2008,21(6). |
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| 作者姓名： | 于强 |
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| 作者单位： | 四川理工学院物理系,四川,自贡,643000 |
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| 摘 要： | 若对裂尖附近的单轴应力场应用叠加原理,则可合成多轴裂尖应力场分布;由裂尖处材料微元体在合应力下的破坏应当服从第四强度理论,则导出多轴作用下的等效应力强度因子;借用Paris公式的形式,则导出了一个多轴疲劳裂纹扩展速度的等效公式;这个公式应当具有工程上的意义。
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| 关 键 词： | 多轴疲劳 裂纹扩展 应力场 等效应力强度因子 Paris公式 |
Study on Multi-axial Fatigue Crack Growth Propagtion Rate in Fracture Mechanics Method |
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| YU Qiang.Study on Multi-axial Fatigue Crack Growth Propagtion Rate in Fracture Mechanics Method[J].Journal of Sichuan University of Science & Engineering:Natural Science Editton,2008,21(6). |
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| Authors: | YU Qiang |
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| Institution: | YU Qiang(Dept.of Physics,Sichuan University of Science & Engineering,Zigong 643000,China) |
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| Abstract: | Suppose the stress toward different directions due to a same fatigue crack in material,that the stress near the top of the crack obeys the vector addition theory,the effect on the stress field finally near the top of the crack.When the material is broken it obeys the forth breaking theory.So we can find out equivalent stress intensity factor.By using Paris Law,we can got the multi-axial fatigue crack growth propagtion rate rule.The rule can be put into practice in the field of engineering. |
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| Keywords: | multi-axial fatigue fatigue crack growth propagtion the stress field equivalent stress intensity factor Paris Law |
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