纤维增强热塑性复合材料复合过程中纤维断裂研究

发布时间：2018-06-03 22:52

本文选题：连续玻璃纤维 + 断裂模型　；参考：《北京化工大学》2015年硕士论文

【摘要】：高性能树脂基复合材料大部分是先通过拉挤熔融工艺成型方法制成连续纤维增强复合材料预浸料或预浸带,而后通过后续成型工艺,诸如注塑、模压、RTM等成型工艺制成目标产品。现如今,预浸料的制备过程已有很多科研成果,包括浸渍理论、界面结合等等,但是鲜有对复合过程中连续纤维断裂的研究,纤维在复合过程中的断裂仅仅停留在经验层面,无法准确描述实验工艺参数及原料性能对复合过程中纤维断裂的影响。通过拉挤熔融成型的工艺方法,成型了连续玻璃纤维增强聚丙烯复合材料预浸料,研究了连续纤维丝束在复合过程中运动历程,分析了其在运动过程中的受力情况,结合纤维丝束本身的强度概率分布函数(二参数的Weibull分布),建立了基于物料参数(树脂的黏度),纤维物性参数(Weibull参数),工艺参数(停留时间、浸渍辊数、模具温度),模具结构尺寸参数的纤维断裂理论模型。利用实验室自主设计加工的连续纤维增强热塑性复合材料(Continuous Fiber Reinforced Thermoplastic Composites)预浸料的制备平台进行实验,对所建立的纤维断裂的理论模型中部分的参数影响规律进行了验证,分别考察了停留时间、模具温度以及浸渍辊数对纤维断裂率和预浸料浸渍效果的影响。最后利用正交实验分析软件,得到在实验室条件下的最优工艺参数,最终得到拉挤熔融成型工艺下制备复合材料预浸料的加工区间,为工业化生产提供一定的参考规范和理论依据。讨论了片状和条状粒料以及粒料纤维含量与注塑制品的残余纤维长度以及力学性能之间的关系,并利用Moldflow模流分析软件分析熔体温度以及纤维含量对制品中纤维状态(纤维取向和残余长度)的影响,并与实验结果进行对比分析。
[Abstract]:High performance resin matrix composites are made into continuous fiber reinforced composite prepreg or prepreg tape by pullout and melting process, and then through subsequent molding processes, such as injection molding, Molding process, such as RTM, to make the target product. Nowadays, many scientific achievements have been made in the preparation of prepreg materials, including impregnation theory, interface bonding and so on. However, there are few studies on continuous fiber fracture in the process of composite, and the fracture of fiber in the process of composite only stays at the empirical level. The effects of experimental process parameters and raw material properties on fiber fracture in the process of composite can not be accurately described. The prepreg of continuous glass fiber reinforced polypropylene (PP) composites was formed by the pullout melt molding process. The motion process of the continuous fiber bundle in the process of composite was studied, and the force acting on the continuous fiber bundle during the process was analyzed. Based on the strength probability distribution function of fiber bundle (Weibull distribution of two parameters), the material parameters (viscosity of resin, fiber physical properties), process parameters (residence time, number of impregnating rolls) were established. The theoretical model of fiber fracture for mould temperature and die structure dimension parameter. The experiment was carried out on the platform of continuous Fiber Reinforced Thermoplastic Composites) prepreg for continuous fiber reinforced thermoplastic composites, which was designed and processed independently in laboratory. The influence of some parameters in the theoretical model of fiber fracture was verified. The effects of residence time, die temperature and number of impregnating rolls on the fiber fracture rate and the impregnation effect of prepreg were investigated. Finally, the optimal process parameters under laboratory conditions are obtained by using orthogonal experimental analysis software. Finally, the processing interval for preparing composite prepreg under pullout and melt forming process is obtained. To provide certain reference norms and theoretical basis for industrial production. The relationship between the fiber content and the length of residual fibers and the mechanical properties of injection molded products are discussed. The effects of melt temperature and fiber content on the fiber state (fiber orientation and residual length) in the products were analyzed by Moldflow software, and the results were compared with the experimental results.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB332

【参考文献】