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- 2019
复合材料带筋壁板预成型体压缩性与渗透性对树脂流动的影响
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Abstract:
以航空碳纤维增强树脂基复合材料典型结构件带筋壁板为研究对象，通过对U3160单向织物的组织结构进行分析，根据纤维束的受压变形状态对其压缩响应进行理论建模，然后以纤维束压缩模型为基础，预测了U3160单向织物按0°/45°/90°/-45°铺层时预成型体在压缩应力作用下厚度变化的响应行为。建立了压缩应力作用下纤维预成型体的渗透率解析模型：在织物压缩模型的基础上，建立了纤维束等效渗透率模型；根据张量理论，分别建立了0°、±45°和90°铺层织物等效渗透率模型；运用渗透介质串并联关系，建立了带筋壁板各特征区域渗透率综合表征模型。基于PAM-RTM流动模拟软件，进行分区渗透率定义，在充模过程中对树脂在带筋壁板预成型体中的流动行为进行模拟，优化工艺参数，确定出最终充模方案，并制作带筋壁板实验缩比件进行成型实验，验证了充模方案的合理性。研究结果为制件的成功制作提供理论依据，从而指导生产实践。 The stiffened panel of the typical aerospace carbon fiber reinforced polymer composite structure was studied by analyzing the characteristics of the U3160 unidirectional fabric organization structure. The compression response of the fiber bundle was theoretically modeled according to the compression deformation state of the fiber bundle. Based on the fiber bundle compression model, the thickness change responses of the U3160 unidirectional fabric preform with the 0°/45°/90°/-45°stacking sequence under the influence of compressive stress were forecasted. The permeability model of the fabric preform under the effect of compression stress was formed. Based on the fabric compression model, the equivalent permeability model of fiber bundle was established. According to the tensor theory, the equivalent permeability model of the 0°, ±45° and 90° ply fabric was established respectively. By using the series-parallel relationship of permeable media, the comprehensive characterization model of permeability in each characteristic zone of stiffened panel was established. Based on the PAM-RTM flow simulation software, the permeability of the partition zone was defined, the flowing behavior of resin in the stiffened-panel fabric preforms was simulated during the filling process, the technological parameters was optimized to determine the final filling program, and the models of stiffened panel were made to carry out the molding experiment to verify the rationality of filling program. The work provides the theoretical basis for the successful production, which can be used to finally guide the practice. 中央高校基本科研业务费专项资金（3102017jg02012）；中国博士后科学基金（2017M613209
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