2024-T42铝合金疲劳裂纹扩展曲线的拟合方法研究

Curve Fitting Study on 2024-T42 Aluminium-Alloy Fatigue Crack G rowth

提出了一种疲劳裂纹扩展曲线 (a N曲线 )的新拟合方法 ,并采用这种新的拟合方法对 2 0 2 4 T4 2铝合金CCT试样的疲劳裂纹扩展数据进行了拟合分析。通过疲劳裂纹扩展寿命计算结果和试验结果的对比分析 ,证明这种新的裂纹扩展曲线拟合方法具有较高拟合精度。经过实验和计算分析 ,还给出了 2 0 2 4 T4 2铝合金的疲劳裂纹扩展速率材料常数c和n值。

A curve fitting method on the fatigue crack growth is developed. Adopting this m ethod,this paper provides the fatigue crack growth data curve fitting analysis of 2024 T42 aluminum alloy CCT specimens.By comparing the experimental result w ith calculated results on fatigue crack growth life,it is proved that this new curve fitting has higher precision. Analyzing experimental and calculated result s,this paper provides the fatigue crack growth rate constants c,n .