Effect of Crack Arrester on Fatigue Crack Growth in Foam Core Sandwich Panel under Mode I Type Loading
Effect of Crack Arrester on Fatigue Crack Growth in Foam Core Sandwich Panel under Mode I Type Loading
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I型加载下止裂剂对泡沫夹芯板疲劳裂纹扩展的影响
DOI：
10.1016/j.compositesa.2013.09.004
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Hojo
中科院分区：
文献类型：
--
作者：
H. Matsuda;G. Matsubara;A. Kuraishi;Y. Hirose;M. Hojo
为了抑制CFRP/泡沫夹芯板表层与芯层之间的界面裂纹扩展，安装了止裂剂。采用双悬臂梁试件，在I型加载条件下，研究了止裂剂对疲劳裂纹扩展的抑制作用。试件由碳/环氧织物预浸料和聚甲基丙烯酰亚胺泡沫芯材制成。有限元分析表明，当裂纹尖端接近止裂器时，裂纹尖端的能量释放率显著降低。用含止裂剂的夹层板试件进行了疲劳裂纹扩展试验。裂纹扩展速率da/dN随裂纹尖端到止裂器边缘距离的减小而减小。从而从实验上验证了止裂器的抑裂效果。当考虑热残余应力时，这种抑制效果与止裂器引起的能量释放率的降低密切相关。
Crack arresters were installed to suppress interfacial crack propagation between the skin and core of CFRP/foam core sandwich panels. The effect of the crack arrester on suppressing the propagation of a fatigue crack was investigated under mode I type loading using double cantilever beam specimens. Specimens were made from carbon/epoxy fabric prepreg and a polymethacrylimide foam core. The energy release rate, calculated by FE analysis, showed a considerable reduction at the crack tip as the tip approached the crack arrester. Fatigue crack propagation tests were carried out using sandwich panel specimens containing the crack arrester. The crack propagation rate, da/dN, decreased with decreasing distance from the crack tip to the arrester edge. Thus, the suppression effect of the crack arrester was demonstrated experimentally. This suppression effect correlated strongly with the decrease in the energy release rate due to the crack arrester when the thermal residual stress was taken into account.