基于单向流动研究三维编织预制件的渗透性  

Permeability of the 3D braided preform based on the unidirectional flow measurement

作　　者：吴晓青[1] 李嘉禄[1] 

机构地区：[1]天津工业大学先进纺织复合材料教育部重点实验室,天津300160

出　　处：《复合材料学报》2007年第3期116-120,共5页Acta Materiae Compositae Sinica

基　　金：天津市自然科学基金资助项目(06YFJMJC03100;013604311);天津市教委发展基金资助项目(20020414)

摘　　要：采用单向法测量了三维编织预制件的饱和与不饱和渗透率,从渗透率实验确定了毛细压力,研究了纤维体积分数对饱和、不饱和渗透率的影响。分析了编织参数、注入压力对渗透率测量的作用,以注入压力Pm为x轴,以相同的某一段时间所到达的流动前沿的平方(x2)为y轴作图,并拟合成直线,该直线与x轴的水平截距即为毛细压力。实验结果表明:随着纤维体积分数的增加,饱和渗透率与不饱和渗透率均降低,且饱和渗透率大于不饱和渗透率;编织结构影响渗透率,不饱和渗透率随着编织角的增加而减小;准确的渗透率的测试结果不依赖注入压力,开始阶段渗透率值较大,随着充模距离的增加,渗透率逐渐降低,并趋于稳定值。The saturated and unsaturated permeabilities of the 3D braided preform were measured by unidirectional flow. The capillary pressure was determined through the permeabilities experiments. The influences of the fiber volume fraction on the saturated and unsaturated permeabilities were studied. The effects of braiding parameter and injection pressures on permeability were analyzed. A plot of different injection pressures against the square distance of the flow front was fitted with a straight line for a certain period of time. The capillary pressure was determined as the horizontal axis intercept value. The experimental results show that saturated and unsaturated permeabilities decrease with increasing the fiber volume fractions. The saturated permeability is larger than the unsaturated permeability. The braiding structure influences the permeability. The unsaturated permeability decreases with increasing the braiding angle. The accurate permeability does not depend on the injection pressure and it denotes a decreasing behavior until it reaches a stabilized value.

关 键 词：三维编织预制件 饱和渗透率 不饱和渗透率 单向流动 RTM 

分 类 号：TB332[一般工业技术—材料科学与工程]