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- 2016
基于热固性树脂基复合材料帽型加筋结构制造的硅橡胶芯模预制调型孔理论建模与实验验证
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Abstract:
硅橡胶芯模是实现热固性树脂基复合材料帽型加筋结构共固化成型的关键工装之一,而在预浸料固化加热过程中硅橡胶芯模的热膨胀需要通过预制适当的调型孔来消除,以保证帽型加筋结构的成型质量。首先,通过建立硅橡胶芯模预制调型孔热力耦合有限元分析模型对不同结构的硅橡胶芯模进行了计算机仿真,从而得出了实现复合材料帽型加筋结构形性协同制造的硅橡胶芯模预制调型孔最佳尺寸范围。然后,综合分析了硅橡胶芯模受热膨胀的可能影响因素,进而建立了考虑体积修正系数的预制调型孔计算模型。接着,利用有限元方法回归了芯模预制调型孔体积修正系数,并利用回归出的修正系数对不同截面尺寸的帽型结构进行了仿真验证,从而确定了较为准确的预制调型孔理论计算模型。最后,通过实验验证了该数学模型及有限元分析方法的正确性,为制造复合材料帽型加筋结构提供了理论与实验依据。 Silicone rubber core mold is one of the key tooling to realize the co-curing molding process of resin matrix thermosetting composite hat-stiffened structures, while in the curing and heating process of prepreg, the heat inflation of silicone rubber core mold needs to be eliminated by prefabricating appropriate adjusting hole, so as to ensure the forming quality of hat-stiffened structure. The silicone rubber core molds with different structures were simulated using computer by establishing the thermo-mechanical coupled finite element analysis model for the prefabricated adjusting hole of silicone rubber core mold, thus the optimal size range of the prefabricated adjusting hole of silicone rubber mold which can realize the collaborative manufacture of shape and properties of composite hat-stiffened structures' was obtained firstly. Then, the possible impact factors of heating expansion of silicone rubber core mold were analyzed comprehensively, so that the calculation model of prefabricated adjusting hole considering the volume correction coefficient was found. After that, the volume correction coefficient for the prefabricated adjusting hole of core mold was regressed by finite element method, and the regressed correction coefficient was employed to conduct the simulation verification of the hat-stiffened structures with different sizes of cross-sections. Thus, the relative accurate theoretical calculating model for prefabricated adjusting hole was determined. Finally, the correctness of the mathematical model and the finite element analysis was verified by experiments, which would provide theory and experimental basis for the fabrication of composite hat-stiffened structures. "973"计划(2014CB046502);中国博士后基金(2014M562127);湖南省博士后专项基金(2014RS4031);国家重点实验室开放基金(Kfkt2013-04)
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