基于同步辐射的3D打印CCF/PEEK复合材料失效机制及缺陷分析  

Failure mechanisms and defect analysis of 3D printed CCF/PEEK composites based on synchrotron radiation

作　　者：吴若涵 康友伟 田小永[2] 刘腾飞 刘铮铮 WU Ruohan;KANG Youwei;TIAN Xiaoyong;LIU Tengfei;LIU Zhengzheng(School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]西安交通大学机械工程学院,西安710049

出　　处：《复合材料学报》2025年第2期747-756,共10页Acta Materiae Compositae Sinica

摘　　要：针对丝材预浸渍处理的连续碳纤维增强聚醚醚酮复合材料(CCF/PEEK),采用同步辐射计算机断层扫描(μCT)表征手段,分析了拉伸/弯曲过程中碳纤维/树脂界面和层间的失效模式及机制,结合缺陷和拉伸力学性能分析,揭示了预浸渍处理对CCF/PEEK材料结构和力学性能的影响。研究结果表明:由于不良浸渍及层间温度梯度,预浸渍样品在纤维/树脂界面和层间均存在缺陷,并随拉伸/弯曲载荷作用演变为层间裂纹,原丝样品则发生纤维脱粘和拔出;预浸渍处理后试样平均拉伸强度提高17.21%,孔隙率降低56.6%,树脂充分渗入纤维丝束,明显改善了材料纤维/树脂界面结合和力学性能。In this study,continuous carbon fiber-reinforced poly-ether-ether-ketone composite(CCF/PEEK)with filament pre-impregnation(prepreg)treatment was investigated.Employing synchrotron radiation computed tomography(μCT)characterization,the failure modes and mechanisms at the fiber/resin interface and interlayers during tensile/bending processes were analyzed.Combined with defect and tensile mechanical property analyses,the impact of prepreg on the structure and mechanical properties of CCF/PEEK materials was elucidated.The results revealed that due to inadequate impregnation and interlayer temperature gradients,defects existed at both the fiber/resin interface and interlayers in the prepreg sample,evolving into interlaminar cracks under tensile/bending loads,while fiber debonding and pull-out occurred in the original sample.After prepreg treatment,the average tensile strength of the samples increased by 17.21%,and the porosity decreased by 56.6%.The resin fully infiltrated the fiber bundles,significantly enhancing the fiber/resin interface bonding and mechanical properties of the material.

关 键 词：连续碳纤维增强聚醚醚酮 同步辐射μCT 失效模式 预浸渍 拉伸强度 

分 类 号：V258.3[一般工业技术—材料科学与工程] TB332[航空宇航科学与技术—航空宇航制造工程]