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Comparative statistical analysis of fatigue crack growth data

机译：疲劳裂纹扩展数据的比较统计分析

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The differences in fatigue crack propagation behavior in 7075-T6 aluminum alloy between specimens damaged by corrosion and those in a baseline (noncorroded) condition are examined using a statistical hypothesis test. Middle tension plate specimens were corroded on one side in the laboratory and subjected to constant load amplitude (K-increasing) tests in dry and moist air environments. The results show that there is a statistically-significant increase in fatigue crack growth rates in the corroded material for stress intensity values based on nominal thickness. When the specimen thicknesses were reduced to account for corrosion material loss, the difference disappeared in most of the instances examined here. In one case, the thickness correction was found to predict fatigue crack growth rates that were slower in the corroded material. This anomalous result suggests that full tickness corrections may not be appropriate at higher stress intensity ranges.
机译：使用统计假设检验检查了7075-T6铝合金在腐蚀破坏的试样与处于基线（未腐蚀）条件下的疲劳裂纹扩展行为之间的差异。在实验室的一侧腐蚀了中拉力板样品，并在干燥和潮湿的空气环境中进行了恒定的载荷振幅（K增加）测试。结果表明，对于基于公称厚度的应力强度值，腐蚀后的材料中疲劳裂纹的增长率有统计学意义的提高。当减少试样厚度以考虑腐蚀材料的损失时，在这里检查的大多数情况下，差异消失了。在一种情况下，发现厚度校正可以预测腐蚀材料中疲劳裂纹的生长速度。此异常结果表明，在较高的应力强度范围内，完全tick痒校正可能不适合。

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