| 疲劳裂纹起始扩展门槛值的研究 |
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| 引用本文： | 刘文珽.疲劳裂纹起始扩展门槛值的研究[J].航空学报,1989,10(12):659-661. |
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| 作者姓名： | 刘文珽 |
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| 作者单位： | 北京航空航天大学 |
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| 摘 要： | 1.疲劳裂纹起始扩展门槛值(△K_(th))的概念 人们通常提到的疲劳裂纹扩展门槛值△K_(th)是在裂纹扩展过程中不断下降△K,使裂纹扩展不断减慢,直至停止扩展时所对应的△K值。它由降K程序测定,试验方法见文献。达到△K_(th)时裂纹前缘塑性区很小,在厚度和应力比一定的条件下,△K_(th)是材料常数。然而,在构件承受变幅交变载荷作用时,某级载荷使裂纹尖端产生应力强度因子K_(fmax),对应
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| 收稿时间： | 1989-04-14; |
RESEARCH OF FATIGUE CRACK INITIATION GROWTH THRESHOLD |
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| Beijing University of Aeronautics and Astronautics Liu Wenting.RESEARCH OF FATIGUE CRACK INITIATION GROWTH THRESHOLD[J].Acta Aeronautica et Astronautica Sinica,1989,10(12):659-661. |
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| Authors: | Beijing University of Aeronautics and Astronautics Liu Wenting |
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| Institution: | Beijing University of Aeronautics and Astronautics Liu Wenting |
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| Abstract: | A new threshold,the fatigue crack initiation growth threshold（ΔKth）i,is proposed in this paper. It is showed by test research that the（ΔKth）i values corresponding to given Kfmax under the same material and stress ratio don't change with crack length, and the functional relationship between （ΔKth）i and Kfmax is nearly linear. |
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| Keywords: | fatigue crack initiation growth threshold fatigue crack growth threshold |
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