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首页> 外文期刊>Journal of Applied Polymer Science >Fracture toughness of carbon fiber/polyether ether ketone composites manufactured by autoclave and laser-assisted automated tape placement
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Fracture toughness of carbon fiber/polyether ether ketone composites manufactured by autoclave and laser-assisted automated tape placement

机译：高压釜和激光辅助自动胶布放置制造的碳纤维/聚醚醚酮复合材料的断裂韧性

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摘要

A comparative study is presented on the fracture toughness of carbon fiber/PEEK composites manufactured by autoclave and laser-assisted automated tape placement (LATP). Formation of a good inter-laminar bond is always a concern in ATP due to the short time available for intimate contact development and polymer healing, yet our double cantilever beam (DCB) tests reveal 60-80% higher Mode I fracture toughness for the LATP processed specimens than for the autoclave processed specimens. This magnitude of difference was unexpected, so specimens were further examined via differential scanning calorimetry, dynamic mechanical analysis, nano-indentation, and scanning electron microscopy. The results indicate that the LATP process has been very effective in heating and consolidating the surface of plies, creating an excellent bond. However, it has been less effective in processing the interior of plies, where a low crystallinity and poor fiber-matrix bonding are evident. The higher fracture toughness of the LATP processed specimens is also not solely due to a better bond, but is partially due to significant plastic deformation in the interior of plies during the DCB test. The findings indicate there is still considerable scope for optimizing the laser-assisted ATP process, before the optimum balance between strength and toughness is achieved at favorable lay-down speeds. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41643.
机译：对通过高压釜和激光辅助自动胶带放置（LATP）生产的碳纤维/ PEEK复合材料的断裂韧性进行了比较研究。由于可用于紧密接触发展和聚合物修复的时间短，因此良好的层间键的形成始终是ATP中需要考虑的问题，但是我们的双悬臂梁（DCB）测试显示LATP的I型断裂韧性提高了60-80％处理过的标本比高压灭菌器处理过的标本好。这种差异的大小是出乎意料的，因此通过差示扫描量热法，动态力学分析，纳米压痕和扫描电子显微镜进一步检查了样品。结果表明，LATP工艺在加热和固结板层表面方面非常有效，形成了极好的粘结。但是，在处理低结晶度和不良的纤维-基体粘结性的层内部时，其效果较差。经LATP处理的试样具有较高的断裂韧性，这不仅是由于具有更好的粘结性，而且还部分归因于DCB测试期间板层内部的明显塑性变形。研究结果表明，在以理想的铺展速度实现强度与韧性之间的最佳平衡之前，优化激光辅助ATP工艺的空间仍然很大。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41643。

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