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Predicting the process-dependent material properties to evaluate the warpage of a co-cured epoxy-based composite on metal structures
Composites Part A: Applied Science and Manufacturing ( IF 8.7 ) Pub Date : 2020-02-27 , DOI: 10.1016/j.compositesa.2020.105857
Robert Thomas , Simon Wehler , Fabian Fischer

By directly curing continuous fiber reinforced thermosets locally onto metal parts, the mechanical performance of these components can be increased significantly by just adding a minimum of weight. Due to the thermal and chemical behavior of the composite material, residual stresses occur and lead to warpage of the structure or failure of the part. This paper deals with a hot-melt, snap-cure matrix material which is characterized as a function of temperature and degree of cure, also the cure kinetics are described based on an Arrhenius-equation. This information is used to simulate the curing of a composite for a press-molding manufacturing process in order to calculate the temperature profile of the material, taking the exothermal reaction of the epoxy into account. Also a metal-composite-hybrid specimen is simulated to evaluate the influence of the manufacturing process on the warpage of the component. Manufacturing trials evaluate the simulation and allow an estimation regarding the forecast quality. Finally, a parametric study illustrated the influence of selected temperature- and degree of cure dependent characteristic values on the prediction accuracy of the simulation to outline the significant influencing factors.



中文翻译:

预测与工艺有关的材料特性,以评估共固化的环氧基复合材料在金属结构上的翘曲

通过将连续的纤维增强热固性塑料直接局部固化到金属零件上,只需增加最小的重量即可显着提高这些零件的机械性能。由于复合材料的热和化学行为,会产生残余应力,并导致结构翘曲或零件损坏。本文介绍了一种热熔的快速固化基体材料,其特征是温度和固化程度的函数,还基于Arrhenius方程描述了固化动力学。该信息用于模拟压模制造过程中复合材料的固化,以便在考虑环氧树脂的放热反应的情况下计算材料的温度曲线。还模拟了一种金属复合材料混合试样,以评估制造工艺对部件翘曲的影响。制造试用会评估模拟并允许对预测质量进行估算。最后,参数研究说明了所选温度和取决于固化程度的特征值对模拟预测精度的影响,以概述重要的影响因素。

更新日期:2020-02-27
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