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首页> 外文期刊>Metallurgical and materials transactions. A, physical metallurgy and materials science >Subcritical Crack Growth at Bimaterial Interfaces: Part Ⅲ. Shear-Enhanced Fatigue Crack Growth Resistance at Polymer/Metal Interface
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Subcritical Crack Growth at Bimaterial Interfaces: Part Ⅲ. Shear-Enhanced Fatigue Crack Growth Resistance at Polymer/Metal Interface

机译：双材料界面的亚临界裂纹扩展：第三部分。聚合物/金属界面的抗剪切疲劳裂纹扩展性

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摘要

Fatigue crack growth along an Al/epoxy interface was examined under different combinations of mode-Ⅰ and mode-Ⅱ loadings using the flexural peel technique. Fatigue crack growth rates were obtained as a function of the total strain energy rate for G_Ⅱ/G_Ⅰ ratios of 0.3 to 1.4, achieved by varying the relative thickness of the outerlayers for the flexural peel specimen. Fatigue crack growth resistance of the interface was found to increase with increasing G_Ⅱ/G_Ⅰ ratio. Such a shear-enhanced crack growth resistance of the interface resulted in a gradual transition of crack growth mechanism from interfacial at the low G_Ⅱ/G_Ⅰ ratio to cohesive at the high G_Ⅱ/G_Ⅰ ratio. Under predominantly mode-Ⅰ loading, the damage in the polymer took the form of crazing and cavitation. In contrast, laminar shear occurred under highly shear loading, resulting in a larger amount of plastic dissipation at the crack tip and improved fatigue crack growth resistance.
机译：采用弯曲剥离技术研究了Ⅰ型和Ⅱ型载荷在不同组合下沿Al /环氧树脂界面的疲劳裂纹扩展。对于G_Ⅱ/G_Ⅰ比值为0.3至1.4的情况，疲劳裂纹扩展速率是总应变能速率的函数，这是通过改变挠性剥离试样外层的相对厚度来实现的。发现界面的抗疲劳裂纹扩展能力随G_Ⅱ/G_Ⅰ比的增加而增加。界面的这种抗剪切增强的裂纹扩展能力导致了裂纹扩展机制从低G_Ⅱ/G_Ⅰ比的界面逐渐过渡到高G_Ⅱ/G_Ⅰ比的内聚力。在Ⅰ型载荷下，聚合物中的损伤表现为开裂和空化。相反，层状剪切在高剪切载荷下发生，导致裂纹尖端处的大量塑性耗散和改善的抗疲劳裂纹扩展性。

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