Permeability of the 3D braided preform based onthe unidirectional flow measurement
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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。Abstract: The saturated and unsaturated permeabilities of the 3D braided preform were measured by unidirectionalflow. The capillary pressure was determined through the permeabilities experiment s. The influences of the fibervolume f raction on the saturated and unsaturated permeabilities were studied. The effect s of braiding parameter andinjection pressures on permeability were analyzed. A plot of different injection pressures against the square distanceof the flow f ront was fitted with a st raight line for a certain period of time. The capillary pressure was determined asthe horizontal axis intercept value. The experimental result s show that saturated and unsaturated permeabilitiesdecrease with increasing the fiber volume f ractions. The saturated permeability is larger than the unsaturated permeability. The braiding st ructure 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.
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