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Fatigue crack growth and delamination behaviours of advanced Al-Li alloy laminate under single tensile overload

机译:先进Al-Li合金层合板在单拉伸载荷下的疲劳裂纹扩展和分层行为

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摘要

In this paper, fatigue crack growth and delamination behaviours of a new fibre metal laminate (FML) named as Al-Li alloy laminate were tested under different single tensile overloads and compared with those of glass laminate aluminium reinforced epoxy. The results indicate that the crack growth rate of Al-Li alloy laminate after overload applied can quickly get back to its original level when the crack grows outside of the overload plastic zone. The overload has no influence on the delamination shape and size of Al-Li alloy laminate. These results are obviously different from those found in the present study for GLARE, in which the crack growth rate cannot recover after overload, even though the crack is far beyond the overload plastic zone. A kink nearby the location of overload applied was found in the obtained delamination shape. This study provides some new results for better understanding the damage tolerance mechanism of FMLs.
机译:本文研究了一种新的名为Al-Li合金纤维金属层压板(FML)在不同的单次拉伸过载下的疲劳裂纹扩展和分层行为,并将其与玻璃层压铝增强环氧树脂进行了比较。结果表明,当裂纹在过载塑料区外生长时,施加过载后的Al-Li合金层合板的裂纹扩展速率可以很快恢复到其原始水平。过载对Al-Li合金层压板的分层形状和尺寸没有影响。这些结果明显不同于目前对GLARE的研究结果,在GLARE中,即使裂纹远远超出了过载塑料区,裂纹的增长率也无法恢复。在获得的分层形状中发现了在过载位置附近的扭结。这项研究提供了一些新的结果,以更好地理解FML的损伤耐受机制。

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