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针对“离位”增韧预成型体的液态成型工艺性,研究了两种不同结构形式增韧层“离位”增韧预成型体的厚度压缩特性。分别采用多孔薄膜结构增韧层、高孔隙率无纺布结构增韧层与碳纤维织物交替铺层制备“离位”增韧预成型体,采用力学试验机测试其厚度压缩特性。实验结果表明,预成型体压缩过程中,在相同压力水平下,增韧层的引入会降低预成型体的纤维体积分数;不同压力水平下,预成型体的压缩行为与增韧层结构形式有关。此外,采用织物预成型体厚度压缩本构模型,对“离位”增韧预成型体的压缩厚度进行了预测,通过模型预测值与实验值的比较,确定了模型中的经验指数k=2时,两者吻合较好。
In view of the liquid forming processability of the “out of position” toughening preform, the thickness compression characteristics of two different toughening layers of “out of position” toughening preform were studied. The porous membrane structure toughened layer, high porosity non-woven structure toughened layer and carbon fiber fabric were alternately laminated to prepare the “out of position” toughening preform, and the thickness compression characteristics were tested by a mechanical testing machine. The experimental results show that the introduction of toughening layer reduces the fiber volume fraction of the preform under the same pressure level during the compression of the preform. The compression behavior of the preform is related to the structure of the toughened layer at different pressure levels . In addition, the compressive thickness of the pre-molded body is predicted by the thickness-compression constitutive model of the fabric preform. Comparing the predicted value with the experimental value, the empirical index k = 2, the two agree well.