Interfacial fatigue crack propagation in microscopic model composite using bifiber shear specimens
Interfacial fatigue crack propagation in microscopic model composite using bifiber shear specimens
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DOI：
10.1016/j.compositesa.2011.09.004
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发表时间：
2012-02-01
影响因子：
8.7
通讯作者：
Adachi, Taiji
中科院分区：
文献类型：
--
作者：
Hojo, Masaki;Matsushita, Yukinobu;Adachi, Taiji
采用双纤维剪切（BFS）试样，在扫描电镜下研究了玻璃纤维（GF）/环氧树脂复合材料界面疲劳裂纹扩展行为。试样由直径为23 μ m和40 μ m的两根E-玻璃长丝组成，在长丝之间浸渍双酚A型环氧树脂。研究了不同应力比下的疲劳裂纹扩展行为，阐明了疲劳裂纹扩展机理。裂纹扩展速率da/dN的变化并不随裂纹长度单调变化，表明抗疲劳裂纹扩展能力沿着单根细丝变化。界面的疲劳裂纹扩展阻力远小于复合材料层合板。不同应力比下玻璃纤维/环氧树脂界面的疲劳裂纹扩展机制受最大能量释放率G（max）控制，这与复合材料层合板的疲劳裂纹扩展机制完全不同。(C)2011爱思唯尔有限公司版权所有。
Interfacial fatigue crack growth behavior in GF/epoxy model composites was investigated using bifiber shear (BFS) specimens in a scanning electron microscope. The specimen is composed of two E-glass filaments with diameters of 23 and 40 mu m, and bisphenol A type epoxy is impregnated between the filaments. The crack growth behavior under different stress ratios was investigated to clarify the fatigue crack growth mechanism. The change in the crack growth rate, da/dN, was not monotonic with crack length, suggesting a variation in the resistance to fatigue crack growth along a single filament. The resistance to fatigue crack growth of the interface is much smaller than that of composite laminates. The fatigue crack growth mechanism of the glass fiber/epoxy interface under different stress ratios is controlled by the maximum energy release rate, G(max), which is completely different from that of composite laminates. (C) 2011 Elsevier Ltd. All rights reserved.