Influence of ratio of hole area for mesh plate layer on through-thickness permeability based on a new designed test bench
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摘要: 纤维预成型体厚度方向渗透率的准确表征是液体模塑成型工艺制备大厚度复合材料计算机优化的关键。网孔板层是布置在试样上下表面、用于控制纤维厚度并防止纤维变形的刚性构件,其开孔率是纤维厚度方向渗透率Kz测量中的重要表征参数。本文首先通过实验对用于控制纤维预成型体厚度的垫圈进行校正;然后在排除纤维体积分数误差的前提下,通过金属网增大网孔板层的开孔率,测量缎纹织物SW220C-100b在不同压力和纤维体积分数下的Kz,提出有效计算面积的概念并得到其变化规律;最后,基于测试结果,研究注射压力和纤维体积分数对Kz的影响。结果表明:有效计算面积随着注射压力和纤维体积分数的增加而减小;纤维体积分数的增大会减小织物的Kz值,网孔板层开孔率的增大会减小注射压力对Kz的影响。Abstract: The accurate characterization of the through-thickness permeability of fiber preforms is the key to the computer optimization of the preparation of composites with large thickness by liquid composite molding. Mesh plate layer is an rigid component for the control of fiber thickness and the prevention of fiber’s deformation, which is placed on the upper and lower surface of the sample. The ratio of hole area for mesh plate layer is an important characteristic parameter in the measurement of through-thickness permeability Kz of fiber. Firstly, the shims used to control the thickness of fiber preforms were calibrated through experiments. On the premise of eliminating the error of fiber volume fraction, the ratio of hole area for mesh plate layer is increased through the metal mesh, the Kz of satin fabric SW220C-100b under different pressures and fiber volume fractions were measured, the concept of effective calculated area was proposed and the change rule of effective calculated area was obtained. Finally, based on the test results, the effects of injection pressure and fiber volume fraction on Kz were studied. The results show that the effective calculated area decreases with the increase of injection pressure and fiber volume fraction. The increase of fiber volume fraction will lead to the decrease of the Kz for fabric. The effect of injection pressure on Kz will be reduced by increasing the ratio of hole area for the mesh plate.
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表 1 增强材料和流体相关参数
Table 1. Relevent parameters of reinforcements and liquid
Type Name Areal density/
(g·m−2)Volume density/
(kg·m−3)SF SW220C-100b 220 2 550 Silicone oil PMX-200 − 960 表 2 17层缎纹织物厚度方向渗透率Kz测试实验分组
Table 2. Experimental groups of through-thickness permeability Kz testing for SF with 17 layers
Fiber volume
fraction/vol%Pressure/MPa With metal mesh 46 0.05 0.1 0.15 0.2 0.25 0.3 48 − 0.1 − − − − 50 0.05 0.1 0.15 0.2 0.25 0.3 52 − 0.1 − − − − 54 0.05 0.1 0.15 0.2 0.25 0.3 Without metal mesh 46 0.05 0.1 0.15 0.2 0.25 0.3 48 − 0.1 − − − − 50 0.05 0.1 0.15 0.2 0.25 0.3 52 − 0.1 − − − − 54 0.05 0.1 0.15 0.2 0.25 0.3 表 3 试验机测试垫圈厚度
Table 3. Thickness values of shims tested in testing machine
Sequence numbers A B C D E F G Thickness/mm 2.944 4.933 1.865 0.181 0.183 0.181 0.187 Sequence numbers H I J K L M N Thickness/mm 0.231 0.181 0.186 4.918 0.233 27.944 9.986 表 4 垫圈组名义厚度和实验机所测厚度
Table 4. Nominal thickness and thickness measured by experimental machine of shims group
Nominal thickness/mm Selected shims Actual thickness/mm Error value/mm Percentage error/% 21.7008 BCKN 21.803 0.1022 0.47 14.3570 ABDEFGHIJKL 14.559 0.2020 1.40 10.7750 EGJLN 10.793 0.0180 0.17 8.2971 ABGL 8.283 −0.0141 −0.17 6.7821 CK 6.710 −0.0721 −1.06 5.8739 DEFHIK 5.955 0.0811 1.38 4.5070 ADEFGHIJL 4.634 0.1720 3.82 3.6698 ADEFI 3.624 −0.0458 1.25 2.8759 CDFHJL 2.877 0.0011 0.04 1.0988 DEFGIJ 1.132 0.0332 3.02 -
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