Analysis of thermoplastic prepreg bending stiffness during manufacturing and of its influence on wrinkling simulations
Analysis of thermoplastic prepreg bending stiffness during manufacturing and of its influence on wrinkling simulations
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DOI：
10.1016/j.compositesa.2014.08.020
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发表时间：
2014-12-01
影响因子：
8.7
通讯作者：
Boisse, Philippe
中科院分区：
文献类型：
--
作者：
Liang, Biao;Hamila, Nahiene;Boisse, Philippe
研究了航空航天用热塑性板材在典型热成型温度下的弯曲性能。温度的影响是最重要的，因为预浸料的制造是在接近树脂熔点的温度下进行的。介绍了在环境舱中进行的悬臂梁试验。在包括制造温度在内的温度范围内测量PEEK-碳缎和PPS-碳缎布的弯曲性能。结果表明，温度对上述热塑性树脂的弯曲刚度有很大影响。测量的弯曲性能用于模拟热成型过程。这些属性对模拟结果的影响也被示出。特别地，成形期间的抗弯刚度决定了可能出现的褶皱的尺寸。分析了褶皱尺寸对弯曲刚度的敏感性。(C)2014爱思唯尔有限公司版权所有。
Bending properties of thermoplastic prepregs used in aerospace are investigated at representative thermoforming temperatures. The influence of temperature is of principal importance because prepreg manufacturing is performed close to the resin's melting point. A cantilever test performed in an environmental chamber is presented. Bending properties of PEEK-carbon satin and PPS-carbon satin prepregs are measured in a range of temperature including manufacturing temperatures. It is shown that the bending stiffness of the fore-mentioned thermoplastic prepregs are greatly influenced by temperature. The measured bending properties are used to simulate a thermoforming process. The impact of these properties on the simulation results is shown as well. Particularly, bending stiffness during forming determines the size of wrinkles that may appear. The sensitivity of wrinkle size with regards to the measured bending stiffness is analysed. (C) 2014 Elsevier Ltd. All rights reserved.