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Analysis of cure induced deformation of CFRP U-shaped laminates

机译：CFRP U形层板的固化引起的变形分析

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The thermochemical and the thermomechanical phenomena that happen during the cure process of a composite material laminate are responsible for the rise of residual stresses and, consequently, for the deformation at the end of the manufacturing process. In this work, the influence of some parameters, such as the laminate thickness, the stacking sequence and the mold radius, on the spring-in angle of a U-shaped laminate was studied exploring a full factorial plan through numerical simulations. Moreover, the influence of the laminate shape on the deformation was investigated. First of all, a numerical model appropriate for cure simulation was introduced and its suitability to simulate the deformation behavior was demonstrated. Using a simulation model instead of running experimental test was important for analyzing the parameters influence without reduce the full factorial plan to a fractional one and without wasting a lot of time and material. As a result, only the stacking sequence influenced the spring-in value, while the effect of the tool radius and laminate thickness was minimal. Finally, a comparison between U-shaped and L-shaped laminates evidenced that the spring-in value was independent of part shape, while this parameter affected the flange warpage.
机译：在复合材料层压板的固化过程中发生的热化学现象和热机械现象导致残余应力的上升，并因此导致制造过程结束时的变形。在这项工作中，研究了一些参数，例如层压板的厚度，堆叠顺序和模具半径，对U型层压板的弹入角的影响，并通过数值模拟探索了完整的因子分解方案。此外，研究了层压体形状对变形的影响。首先，介绍了适用于固化模拟的数值模型，并证明了其适用于模拟变形行为。使用仿真模型代替运行实验测试对于分析参数影响非常重要，而不会将完整的因子分解计划缩减为一部分分解方案，并且不会浪费大量时间和材料。结果，只有堆叠顺序会影响弹入值，而刀具半径和层压板厚度的影响却很小。最后，在U形和L形层压板之间进行比较，结果表明，弹入值与零件形状无关，而该参数会影响凸缘的翘曲。

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