复合材料构件预制体压实致密工艺研究
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摘要
为实现柔性导向三维织造复合材料构件预制体织造过程中结构的致密化,采用数字化压实致密系统对三维织造复合材料构件进行压实特性研究,测量并记录压实过程中压实位移、压实载荷及构件回弹量与成形工艺参数之间的作用规律,揭示了纤维体积分数与压缩应力的关系。研究表明数字化柔性导向三维织造复合材料构件致密化压实过程可分为低应力线性预压实、非线性过渡压实和高应力紧密压实三个阶段,并建立复合材料构件预制体结构致密化特性的理论公式。在压实致密过程中对构件进行保压处理,分析压实载荷与保压时间的关系,表明柔性导向三维织造构件的可压缩性随着织造层数的增多而逐渐降低,回弹量与织造层数正相关,平均每层纤维回弹量逐渐降低并趋于稳定。
In order to achieve the densification of the structure of the flexible guided three-dimensional weaving composite prefabricated component during the weaving process, a digital compaction system is used to study the compaction characteristics of the three-dimensional woven composite component, and the compaction displacement and compaction during the compaction process are measured and recorded. The relationship between the load and the spring-back of the component and the forming process parameters reveals the relationship between fiber volume fraction and compressive stress. It shows that the densification and compaction process of digital flexible oriented three-dimensional weaving composites can be divided into three stages: low-stress linear pre-compaction, non-linear transitional compaction and high-stress compaction, and the densification of the composite preform structure are established. The theoretical formula of the characteristic, in the process of compaction and densification, the components are subjected to pressure maintaining treatment, and the relationship between compaction load and holding time is analyzed. It shows that the compressibility of the flexible guided three-dimensional weaving components gradually decreases with the increase of the number of layers, the rebound amount and weaving. The number of layers is positively correlated, and the average fiber rebound per layer gradually decreases and tends to be stable.
In order to achieve the densification of the structure of the flexible guided three-dimensional weaving composite prefabricated component during the weaving process, a digital compaction system is used to study the compaction characteristics of the three-dimensional woven composite component, and the compaction displacement and compaction during the compaction process are measured and recorded. The relationship between the load and the spring-back of the component and the forming process parameters reveals the relationship between fiber volume fraction and compressive stress. It shows that the densification and compaction process of digital flexible oriented three-dimensional weaving composites can be divided into three stages: low-stress linear pre-compaction, non-linear transitional compaction and high-stress compaction, and the densification of the composite preform structure are established. The theoretical formula of the characteristic, in the process of compaction and densification, the components are subjected to pressure maintaining treatment, and the relationship between compaction load and holding time is analyzed. It shows that the compressibility of the flexible guided three-dimensional weaving components gradually decreases with the increase of the number of layers, the rebound amount and weaving. The number of layers is positively correlated, and the average fiber rebound per layer gradually decreases and tends to be stable.
引文
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[2]庞生洋,胡成龙,杨鸷,等.预制体结构对C/C复合材料力学性能_断裂行为以及热物性能的影响[J].机械工程学报,2018,54(9):97-107.PANG Shengyang,HU Chenglong,YANG Zhi,et al.Effects of preform structure on mechanical properties,fracture behavior and thermal properties of C/Ccomposites[J].Journal of Mechanical Engineering,2018,54(9):97-107.
[3]王奔,高航,郭东明.树脂固化温度与纤维铺设方式对C/E复合材料制孔质量的影响[J].机械工程学报,2011,47(12):19-25.WANG Ben,GAO Hang,GUO Dongming.Effect of resin curing temperature and fiber laying method on hole quality of C/E composites[J].Journal of Mechanical Engineering,2011,47(12):19-25.
[4]GREEN S D,LONG A C,SAID B S F E,et al.Numerical modelling of 3D woven preform deformations[J].Composite Structures,2014,108:747-756.
[5]ISART N,SAID B E,IVANOV D S.Internal geometric modelling of 3D woven composites acomparison[J].Composite Structures,2015,232:1219-1230.
[6]RAHALI Y,GODA I,GANGHOFFER J F.Numerical identification of classical and nonclassical moduli of 3Dwoven textiles and analysis of scale effects[J].Composite Structures,2016,135:122-139.
[7]CHEN B,CHENG A,CHOU T.A nonlinear compaction model for fbrous preforms[J].Composites:Part A,2001(32):701-707.
[8]CHEN B,CHOU T.Compaction of woven fabric preforms nesting and multi-layer deformation[J].Composites Science and Technology,2000,60:2223-2231.
[9]CHEN B,LANG E J,CHOU T.Experimental and theoretical studies of fabric compaction behavior in resin transfer molding[J].Materials Science and Engineering,2001,317:188-196.
[10]CHEN Z,YE L,KRUCKENBERG T.Amicromechanical compaction model for woven fabric preforms Part I:Single layer[J].Composites Science and Technology,2006,66:3254-3262.
[11]CHEN Z,YE L.A micromechanical compaction model for woven fabric preforms.PartII multilayer[J].Composites Science and Technology,2006,66:3263-3272.
[12]POTLURI P,SAGAR T V.Compaction modelling of textile preforms for composite structures[J].Composite Structures,2008,86:177-185.
[13]蒋建军,陈星,邓国力,等.嵌套效应对单向织物压缩行为的影响[J].复合材料学报,2017,34(11):2463-2472.JIANG Jianjun,CHEN Xing,DENG Guoli,et al.Effect of nesting effect on the compression behavior of unidirectional fabrics[J].Journal of Composites,2017,34(11):2463-2472.
[14]单忠德,康怀镕,臧勇,等.三维织造层间增强的纤维棒复合材料细观结构模型及力学性能有限元模拟[J].复合材料学报,2015,32(1):138-149.SHAN Zhongde,KANG Huaiyu,ZANG Yong,et al.Microstructure model and mechanical properties finite element simulation of reinforced fiber rod composites reinforced by three-dimensional weave layers[J].Journal of Composites,2015,32(1):138-149.
[15]刘云志,单忠德,战丽,等.柔性导向三维正交结构复合材料预制体建模研究[J].工程塑料应用,2016,44(6):63-66.LIU Yunzhi,SHAN Zhongde,ZHAN Li,et al.Modeling of flexible guided three-dimensional orthogonal composite preforms[J].Engineering Plastics Application,2016,44(6):63-66.