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Comparison of Experimental and Modeling Results for Cure Induced Curvature of a Carbon Fiber Laminate

机译:固化碳纤维层压板治疗抗曲率的实验性和建模结果的比较

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The use of carbon fiber laminated structures has steadily grown in industrial use during recent decades where the part performance is a function of both the manufacturing process and the underlying constitutive materials. This work presents an approach to predict the part geometry and internal stress state from experimentally characterized constitutive properties due to the manufacturing cure cycle. Our predicted results for the internal stress state are in agreement with that of previous published works, and the predicted part deformations agree with the experimental results for both of the fiber packing densities investigated. The uniqueness of this work is in the aspect of using basic micromechanical models to determine the dependence of the lamina behavior on the structural and thermal constitutive properties of an individual fiber and the surrounding polymer matrix. A full three-dimensional (3D) FEA model is constructed with spatially varying properties obtained from the predicted lamina properties. The study models the cooling aspect of part fabrication after cure has been completed and the furnace temperature has dropped below the polymer's glass transition temperature. A discussion is provided at the end for the limitations of the approach and also where additional work would be needed to extend this approach to a physical system that does not follow the epoxy system investigated. (C) 2015 Society of Plastics Engineers
机译:近几十年来,碳纤维层压结构在工业应用中的应用稳步增长,其中零件性能是制造工艺和基础本构材料的函数。这项工作提出了一种方法来预测零件几何形状和内应力状态,从实验表征的本构特性,由于制造固化周期。我们对内应力状态的预测结果与之前发表的工作一致,预测的零件变形与所研究的两种纤维堆积密度的实验结果一致。这项工作的独特之处在于使用基本的微观力学模型来确定薄板行为对单个纤维和周围聚合物基体的结构和热本构特性的依赖性。利用从预测的薄板特性获得的空间变化特性,构建完整的三维(3D)FEA模型。该研究对固化完成后零件制造的冷却方面进行了建模,熔炉温度降至聚合物的玻璃化转变温度以下。最后讨论了该方法的局限性,以及将该方法扩展到不遵循所研究环氧树脂系统的物理系统时需要进行的额外工作。(C) 2015年塑料工程师学会

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