Influence and optimization of parameters of prepreg viscosity during placement

• Published in: Chinese journal of aeronautics Vol. 35; no. 4; pp. 438 - 449
• Main Authors: ZU, Lei, XIA, Xianzhao, ZHANG, Qian, JIA, Xiaolong, WANG, Huabi, ZHANG, Guiming, LU, Jinhu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2022; Anhui Province Key Laboratory of Aerospace Structural Parts Forming Technology and Equipment,Hefei University of Technology,Hefei 230009,China%Key Laboratory of Carbon Fiber and Functional Polymers,Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,China; State Key Laboratory of Organic-Inorganic Composites,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China
• Subjects: Automatic placement; Cohesion model; Optimization; Peel test; Probe test; Significance of influence; Viscosity; Viscosity; Automatic placement; Peel test; Probe test; Cohesion model; Significance of influence; Optimization
• ISSN: 1000-9361
• DOI: 10.1016/j.cja.2021.10.016

This paper tested the viscosity of prepreg in the automatic placement process, and conducted the probe and placement-90° peel tests through the test systems. The law of variation of prepreg viscosity during the laying process was studied through these tests under different conditions by taking the peel force to intuitively and quantitatively characterise the viscosity of the prepreg. The results show that this viscosity is inversely proportional to the laying rate, proportional to the laying pressure, and quadratic to the laying temperature. Then, peel tests were simulated to validate both the correctness of the peel test and that of the probe test data fitting the two-line cohesion model. On this basis, a response surface test for laying and peeling was designed. Taking viscous peel force as the response target, the laying process parameters were optimised and the significance of their influence was further studied. The error between the test value and the predicted value of the maximum viscous peel force is 3.03%.