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Fatigue crack growth in heat-treated aluminium alloys

机译：热处理铝合金的疲劳裂纹扩展

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摘要

Fatigue crack propagation tests have been performed in several heat-treated aluminium alloys under constant amplitude loading. All experiments were performed, in load control, in a servo-hydraulic closed-loop mechanical test machine. The tests were carried out using middle tension, M(T), specimens. The influence of stress ratio and thickness were analysed. Crack closure was monitored in all tests by the compliance technique using a pin microga-uge. A strong stress ratio and material dependence effects on the fatigue crack growth were observed. These effects are discussed in terms of the different dominant closure mechanism. The crack growth behaviour of heat-treated aluminium alloys depends mainly on whether the dominant closure mechanism is plasticity-induced or roughness-induced. The enhancement of roughness-induced closure promotes higher crack growth resistance in these alloys. Roughness-induced closure dominates crack closure in aluminium alloys age hardened by naturally ageing and also artificially aged alloys with higher contents of Mn and Cr elements. In alloys aged hardened by artificially ageing and simultaneously with a lower content of these alloying elements plasticity-induced closure is dominant.
机译：在恒定振幅载荷下，对几种热处理铝合金进行了疲劳裂纹扩展测试。在负载控制下，所有实验均在伺服液压闭环机械试验机中进行。使用中间张力M（T）样本进行测试。分析了应力比和厚度的影响。在所有测试中，使用销钉微型规通过顺应技术监控裂纹闭合。观察到强应力比和材料依赖性对疲劳裂纹扩展的影响。将根据不同的显性关闭机制来讨论这些效果。热处理铝合金的裂纹扩展行为主要取决于主要的闭合机制是塑性诱导还是粗糙度诱导。粗糙度引起的闭合的增强促进了这些合金中更高的抗裂纹扩展性。粗糙度引起的闭合在经自然时效硬化的铝合金以及具有较高Mn和Cr元素含量的人工时效合金中，裂纹闭合占主导。在通过人工时效硬化的合金中，同时这些合金元素的含量较低，可塑性闭合性占主导地位。

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