基于探针试验的预浸料黏性内聚力模型

doi:10.7527/S1000-6893.2017.421416

Abstract

Abstract: The tack behavior between prepreg and the mould during the laying process and its variation with process parameters are studied by the probe test. It is found that the laying rate, pressure and temperature have a significant effect on the tack behavior of the prepreg in the experiment, and there exist two failure modes:the interfacial failure mode (low temperature) and cohesive failure mode (high temperature). The tack behavior of prepreg is then characterized by the exponential Cohesive Zone Model (CZM), which is used to describe the debonding process of prepreg including rapid increase of stress, damage propagation and ultimate failure of bond layer at different temperatures. The quantitative relationship between the CZM parameters of prepreg tack and the laying process parameters. The results show that the bond strength and the characteristic displacement of prepreg decline nearly linearly with the growth of the laying rate, and go up nearly linearly with the rise of the laying pressure. With the growth of the laying temperature, the CZM parameters of prepreg tack increase at first and then decrease, showing approximately quadratic relationship. The result can provide some reference for laying process planning under specific laying conditions.

Key words: automated placement, prepreg, tack behavior, probe test, Cohesive Zone Model (CZM)

CLC Number:

V258
TB332

SHU Zhan, PENG Xiao, LI Fafei, XU Qiang. Cohesive zone model for prepreg tack based on probe test[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(2): 421416-421416.

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Cohesive zone model for prepreg tack based on probe test

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