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缺口小裂紋的疲勞擴展速率

On the Short Fatigue Crack Propagation Rate at Notch

  • 摘要: 將復型技術應用于疲勞小裂紋擴展試驗中的裂紋長度測量。在等載荷比R=0.1、不同平均載荷水平影響的疲勞條件下,板試樣V型缺口小裂紋疲勞擴展速率做了試驗測試;通過結果分析,提出了缺口小裂紋疲勞擴展速率表達式,并以εP為控制參數,求出45*鋼的計算式。

     

    Abstract: Reconstructed model technique is successfully applied to measure short fatigue crack length in the testing work. According to elastic-plastic fracture mechanics method, it is put forward an estimated formula for short fatigue crack propagation rate at notch. Using △εp (effective plastic strain range of crack tip) as a controlling parameter, the solution to the normalizing problem of propagation rate of short fatigue crack as well as long fatigue crack at notch for 45# steel are given.

     

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