Damage behaviors in cross-ply cloth CFRP laminates cured at different temperatures
Damage behaviors in cross-ply cloth CFRP laminates cured at different temperatures
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DOI：
10.1299/mej.20-00383
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发表时间：
2020
影响因子：
4.4
通讯作者：
M. Fikry;S. Ogihara
中科院分区：
文献类型：
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作者：
M. Fikry;S. Ogihara
研究了不同固化温度下正交铺层[0/904]布碳纤维增强塑料（CFRP）层合板的损伤行为。对通过真空辅助树脂传递模塑（VaRTM）方法制造的试样进行单调和循环加载，其中树脂在室温和80摄氏度（后固化温度）下固化。残余性能，杨氏模量等，连同损伤积累，已被记录为施加应力的函数。在本研究中，已进行DCB试验用于基体断口分析。当实施后固化程序时，可以观察到层压板的机械性能、损伤引发和进展的显著差异。对于室温固化的层合板，基体裂纹在试样的边缘任意地起始，并受到织物层合板中的空隙和其它内部结构如纬纱等的影响，而不完全沿层合板的厚度方向或宽度方向扩展。然而，对于后固化层压板，裂纹开始在边缘处，并通过层压板的厚度和宽度方向传播。基体断口分析结果表明，在室温下固化的层合板表现出更多的塑性变形，表现出较少的脆性相比，在较高的温度下固化的层合板作为基体表现在一个更脆的方式，这增强了拉伸微裂纹。
Damage behaviors in cross-ply, [0/904]s cloth Carbon Fiber Reinforced Plastic (CFRP) laminates with different curing temperatures have been observed as a function of applied stress. Coupons manufactured by Vacuumassisted Resin Transfer Molding (VaRTM) method with resin cured at room temperature and at 80-degree Celsius (post-curing temperature) were monotonically and cyclically loaded. Residual properties which are Young’s modulus etc. together with damage accumulation, have been recorded as a function of applied stress. DCB tests have been performed for matrix fractography purpose in this study. Significant differences can be observed in the mechanical properties, damage initiation, and progression in the laminates when the post-curing procedure is implemented. For room temperature cured laminates, matrix cracks initiated arbitrarily on the edge of the coupon with the influence of voids and other internal structures in the cloth laminates such as wefts, etc. without completely propagating in the thickness nor the width direction of the laminates. However, for post-cured laminates, cracks started at the edges and propagated through the thickness and width direction of the laminates. Matrix fractography results show that laminates cured at room temperature exhibit more plastic deformation which showed fewer brittle properties compared to laminates cured at higher temperatures as the matrix behaved in a more brittle fashion, which enhanced the tensile microcracking.