Cooling rate influences in carbon fibre/PEEK composites. Part 1. Crystallinity and interface adhesion
Cooling rate influences in carbon fibre/PEEK composites. Part 1. Crystallinity and interface adhesion
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DOI：
10.1016/s1359-835x(00)00009-9
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发表时间：
2000-01-01
影响因子：
8.7
通讯作者：
Kim, JK
中科院分区：
文献类型：
--
作者：
Gao, SL;Kim, JK
基于纤维断裂、纤维拉拔和短梁剪切测试，表征了冷却速率对碳纤维/半晶聚醚醚酮（PEEK）复合材料纤维-基体界面粘合力的影响。界面粘附力与纯 PEEK 树脂的结晶度和晶体形态以及整体机械性能相关，所有这些都由冷却速率控制。结果表明，随着冷却速率的增加，界面结合强度降低；随着冷却速率的增加，PEEK树脂的拉伸强度和弹性模量下降，而延展性通过其对结晶度和球晶尺寸的主导影响而增加。结晶完善度的提高和相间区域高结晶度的扁平片链是低冷却速率下复合材料中强界面结合的主要原因。相间失效的特征是缓慢冷却的复合材料中的脆性脱粘，而快速冷却的样品中引入的富含非晶态 PEEK 的界面相则以延展性方式失效，并产生大量塑性屈服。 (C) 2000 Elsevier Science Ltd. 保留所有权利。
The effect of cooling rate on the fibre-matrix interface adhesion for a carbon fibre/semicrystalline polyetheretherketone (PEEK) composite was characterised based on the fibre fragmentation, fibre pullout and short beam shear tests. The interface adhesion was correlated to the degree of crystallinity and the crystalline morphology, as well as the bulk mechanical properties of neat PEEK resin, all of which were in rum controlled by cooling rate. It was shown that the interface bond strength decreased with increasing cooling rate; the tensile strength and elastic modulus of PEEK resin decreased, while the ductility increased with increasing cooling rate through its dominant effect on crystallinity and spherullite size. The improvement of crystalline perfection and flattened lamella chains with high crystallinity at the interphase region were mainly responsible for the strong interface bond in composites processed at a low cooling rate. The interphase failure was characterised by brittle debonding in slow-cooled composites, whereas the amorphous PEEK-rich interphase introduced in fast cooled specimens failed in a ductile manner with extensive plastic yielding. (C) 2000 Elsevier Science Ltd. All rights reserved.