Scanning electron microscopy observations of fatigue crack growth retardation due to block overloads

机译：扫描电子显微镜观察块超载引起的疲劳裂纹扩展延迟

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Fatigue crack propagation behaviour of 2024-T3 aluminium (Al) alloy under periodic overloads superimposed on constant amplitude loadings with R=0.5 and f=10 Hz was investigated by scanning electron microscopy (SEM). During the variable amplitude loading tests for every 1200, 2500 and 5000 cycles, a block of 100 cycles overload was applied. For variable amplitude loading tests, crack propagation rates were lower than in constant amplitude loading tests. Applied periodic overloads have a retardation effect on crack propagation and this effect was greater for 2500 cycles than 1200 and 5000 cycles. In the SEM, the retardation effect of block overloading was clearly observed.

机译：通过扫描电子显微镜（SEM）研究了2024-T3铝（Al）合金在周期性超载下（R = 0.5和f = 10 Hz的恒定振幅载荷下）的疲劳裂纹扩展行为。在每1200、2500和5000个周期的可变振幅负载测试期间，施加了100个周期的过载块。对于可变振幅载荷测试，裂纹扩展率低于恒定振幅载荷测试。施加的周期性过载对裂纹扩展具有延迟作用，并且这种影响在2500个循环中大于1200和5000个循环。在SEM中，清楚地观察到了嵌段过载的延迟作用。

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《Institute of Physics Electron Microscopy and Analysis Group Conference, Sep 5-7, 2001, Dundee》|2001年|p.223-226|共4页
会议地点 Dundee(GB);Dundee(GB)
作者
D Turan; S Turan; N Ay;
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作者单位

Anadolu University, Civil Aviation School, Iki Eylul Campus, Eskisehir, Turkey;

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原文格式 PDF
正文语种 eng
中图分类无线电电子学、电信技术;
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Scanning electron microscopy observations of fatigue crack growth retardation due to block overloads

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