预成型体渗透率预测及其受压缩变形的影响  

Permeability prediction of preform and influence of compression deformation

作　　者：金天国[1] 魏雅君[1] 杨波[1] 毕凤阳[1,2] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨150001 [2]黑龙江工程学院机电工程学院,哈尔滨150001

出　　处：《复合材料学报》2015年第3期840-847,共8页Acta Materiae Compositae Sinica

基　　金：国家"863"项目(2012AA03A202);哈尔滨青年科技创新人才研究项目(2013RFQYJ161)

摘　　要：建立了织物预成型体单胞内纱线间细观流动和纱线内部微观流动的统一的数学模型。基于最小势能原理建立了织物松弛状态下的单胞几何模型,同时对在模具压缩下的单胞变形进行了分析,并建立了不同压缩状态下的单胞几何模型。通过对单胞内树脂流动数学模型的数值求解,获得了流动速度场及压力场,进而预测了预成型体的渗透率。预测1组不同压缩状态下的单胞渗透率,研究了预成型体压缩变形对渗透率的影响。结果显示:随着压缩量的增加,其渗透率逐渐降低。通过实验测量及数据分析,验证了建模和预测方法的正确性。Mathematical models that objectify both resin meso flow between adjacent yarns themselves and micro flow in yarns were established for textile preform unit cell.Based on the principle of minimum potential energy,geometric model of unit cell in slack state was built.Meanwhile,the deformation of unit cells influenced by mold compression was analyzed,and the geometric models of different compressed states were established.According to the mathematical model solution of resin flowing in unit cell,fields of flow velocity and pressure were obtained.Forecasts of the preform permeability were then conducted.Permeability of a group of unit cell was predicted.The effects of compression deformation of preform on permeability were studied.Results show that with the increase of deformation amount,the permeability gradually decreases.Through the experimental results and data analysis,the correctness of models and the forecast method were verified.

关 键 词：渗透率 预成型体 压缩变形 几何建模 流动仿真 

分 类 号：TB332[一般工业技术—材料科学与工程]