“离位”增韧预成型体压缩特性  

Compaction properties of “ex-situ” toughened preforms

作　　者：刘刚[1] 李伟东[1] 李龙[2] 肇研[2] 益小苏[1] 

机构地区：[1]中航工业复合材料技术中心北京航空材料研究院先进复合材料重点实验室,北京100095 [2]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《复合材料学报》2015年第4期1194-1200,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51203144)

摘　　要：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。According to the requirments of liquid composite moulding, the compaction behaviors of two types of ＂ex-situ＂ toughened preforms were investigated. The preforms were fabricated by interleaving such ＂ex-situ＂ tough- ening layers as the porous film or the non-woven fabric between the carbon fabrics. The thickness of the preforms under different pressure was measured by the mechanical testing machine. The results show that the ＂ex-situ＂ toughening layers decreses the fiber volume fraction of the preforms under a certain pressure, and the compaction behaviors of the preforms,under different pressures, depend on the micro-structure of the toughening layers. Addi- tionally, the thickness of the preforms was predicted by adopting a compaction constitutive model for the fabric. It is shown that the calculated results are in good agreement with the experimental results when the empirical coefficient k=2.

关 键 词：“离位”增韧 预成型体 厚度压缩 本构模型 织物 

分 类 号：TB332[一般工业技术—材料科学与工程]