三维斜交机织复合材料细观结构与力学性能研究

发布时间：2018-06-27 03:54

本文选题：三维机织 + 细观模型　；参考：《南京航空航天大学》2017年硕士论文

【摘要】：本文所研究的三维斜交机织复合材料是一种新型的三维机织复合材料,它不但具有传统三维机织复合材料所共有的优点,还具有传统三维机织复合材料所没有的独特优势,值得深入研究。本文主要对以下几个方面进行了研究。首先,研究三维斜交机织预制件的机织工艺和纱线的空间走向,获得了其纱线在空间的分布情况,直观地展现了三维斜交机织复合材料的细观结构。根据三维斜交机织复合材料的细观结构和机织参数,建立了三维斜交机织复合材料的单胞模型。其次,采用成熟的树脂传递模塑工艺对三维斜交机织复合材料进行复合成型,获得了符合实验要求试验件;在MTS疲劳试验机上完成三维斜交机织复合材料的拉伸性能测试,得到三维斜交机织复合材料的杨氏模量和泊松比。接着,采用刚度平均法证明三维斜交机织复合材料是一种正交各向异性材料,并用该方法以及Kregers加权平均模型分别求解其刚度性能,得到了独立的9个工程弹性常数,并将理论预测的结果与实验结果对比。最后,基于前述的单胞模型,用有限元分析计算得到了三维斜交机织复合材料的弹性常数并与实验值对比;利用Abaqus/Explicit进行显式动态分析,通过用户自定义材料VUMAT子程序,对损伤单元进行刚度折减。分别采用Mises准则和Puck准则判断基体和纤维材料的失效状态,模拟拉伸作用下的损伤过程,最终得到了三维斜交机织复合材料的强度性能。
[Abstract]:The three-dimensional skew woven composite material studied in this paper is a new type of three-dimensional woven composite. It not only has the common advantages of the traditional 3D woven composite material, but also has the unique advantages of the traditional 3D woven composite material, which is worthy of further study. The main purpose of this paper is to study the following aspects. The weaving process of three-dimensional skew woven preform and the spatial direction of yarn are investigated. The distribution of yarn in space is obtained, and the microstructure of the three-dimensional skew woven composite material is displayed intuitively. A single cell model of 3D skew woven composites is built on the basis of the microstructure and weaving parameters of the 3D skew woven composite fabric. Secondly, the mature resin transfer molding process was used to compounded the three-dimensional skew woven composites, and the test parts were obtained. The tensile properties of the 3D skew woven composites were tested on the MTS fatigue test machine, and the young's modulus and Poisson's ratio of the 3D skew woven composites were obtained. The degree averaging method proves that the three-dimensional skew woven composite material is a kind of orthotropic material, and uses this method and the Kregers weighted average model to solve its stiffness performance respectively. The independent 9 engineering elastic constants are obtained, and the results from the theoretical prediction are compared with the experimental results. The elastic constants of the three-dimensional skew woven composites were calculated and compared with the experimental values. The explicit dynamic analysis was carried out by Abaqus/Explicit. The stiffness reduction of the damage unit was reduced by the user custom material VUMAT subroutine. The failure state of the base body and fiber material was judged by the Mises criterion and the Puck criterion respectively. Finally, the strength properties of 3D skew woven composites were obtained by using the damage process.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB33

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