Processing and characterization of the thermoplastic composites manufactured by ultrasonic vibration-assisted automated fiber placement
Processing and characterization of the thermoplastic composites manufactured by ultrasonic vibration-assisted automated fiber placement
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DOI：
10.1177/0892705717697781
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发表时间：
2018-03-01
影响因子：
3.3
通讯作者：
Chen, Xiaodong
中科院分区：
文献类型：
--
作者：
Chu, Qiyi;Li, Yong;Chen, Xiaodong
利用自动铺放技术实现热塑性复合材料的原位固化，获得热压罐级的力学性能是近年来的研究热点。利用不同的热源来追求改善的机械性能和沉积速率，但还不是很令人满意。本文通过力学性能和结晶性能的测试，比较了超声振动辅助法（UAFP）和高压釜法制备的无碱玻璃纤维/聚丙烯层合板的性能。基于超声加热和自粘接原理，对界面粘接机理进行了理论分析。通过正交试验研究了超声振幅、铺层速度、铺层压力等工艺参数对层间剪切强度的影响，优化了试件的制备工艺。利用力学性能测试和差示扫描量热法（DSC）对热压和UAFP层合板的层间剪切强度、I型层间断裂韧性G（IC）、冲击韧性和结晶度进行了评价。实验结果表明，UAFP试样的层间剪切强度可以与热压试样相匹配。UAFP试样的G（IC）和冲击韧性分别比热压试样低59.9%和20.1%，这是由于UAFP过程中较高的冷却速率导致结晶度较低。差示扫描量热法（DSC）的结果表明，用UAFP制备的样品的结晶度仅为38.5%，而用热压法制备的样品的结晶度为49.2%。
To obtain the autoclave-level mechanical properties using in situ consolidation of thermoplastic composites by automated fiber placement (AFP) with high efficiency is the focus of recent research. Different heat resources were utilized to pursue improved mechanical properties and deposition rates but yet not very satisfactory. In this article, E-glass fiber/polypropylene laminates, manufactured by ultrasonic vibration-assisted AFP (UAFP) and autoclave, were compared by means of mechanical properties and crystallization. The interfacial bonding mechanism was analyzed theoretically based on the principle of ultrasonic heating and the autohesion. The orthogonal tests were designed to study the effect of the process parameters on the interlaminar shear strength (ILSS), including the ultrasonic amplitude, layup speed, and pressure, to optimize the manufacturing process of specimens. The mechanical tests and differential scanning calorimetry (DSC) were utilized to evaluate the ILSS, mode I interlaminar fracture toughness G(IC), impact toughness, and degree of crystalline of laminates from hot-press and UAFP. The experimental results indicate that the ILSS of the specimens from UAFP can match with the hot-press specimens. The G(IC) and the impact toughness of the UAFP specimens are 59.9% and 20.1% lower than the hot-press ones, respectively, which are due to the lower degree of crystalline caused by the higher cooling rate during the UAFP process. The results of DSC show that the crystallinity of specimens made from UAFP is only 38.5%, whereas the 49.2% crystallinity is tested for the hot-press.