【作者】 张旭东；

【导师】 李旭东；

【作者基本信息】 兰州理工大学 ， 材料物理与化学， 2012， 硕士

【摘要】 复合材料技术是一项具有战略意义的国防关键技术，在一定程度上，先进复合材料的研究水平和应用程度是一个国家科技发展水平的代表，特别是在飞机制造业，各种先进的飞机无不与先进的材料技术紧密。随着复合材料在飞机上应用比例的加大，在复合材料制造领域，先进的数字化设计制造技术和计算机辅助工程(CAE)技术等得到了广泛应用。本研究利用本课题组特色技术，以国家/行业标准为基准，以大型商用有限元软件ABAQUS软件作为建模计算平台，采用Python语言脚本参数化设计语言，对某飞机蒙皮CKFR-PMCs编织型层合结构复合材料的性能进行了研究。完成了铺层结构代表性体积单元(RVE)和相关力学性能试验的试样数值模型的建立，模拟了包括拉伸/压缩试验、剪切试验、弯曲性能试验、层间剪切强度试验、纵横剪切试验在内的复合材料基本力学试验。应用Python语言编写脚本程序，实现了编织型层合结构复合材料有限元模型中纤维体积分数含量的控制以及各向异性材料局部坐标与整体坐标下输出变量的转换。对层合结构复合材料各结构层的碳纤维/芳纶纤维材料、基体材料的性能进行了反推预测，对40%纤维含量复合材料性能的进行了验证性计算。本文对编织型层合结构复合材料的力学性能预测给出了较为完整的思路与方法。对于不同性能的纤维、基体材料，不同纤维体积分数含量，不同纤维铺设铺层角度，不同加载方向的纤维增强复合材料和编织复合材料的力学性能预测具有一定的通用性。对后面开展编织型层合结构复合材料的分层多尺度研究和跨尺度研究提供了数值上的准备与方法上的参考。更多还原

【Abstract】 Composite technology is a strategic key technology for national defense. To someextent, the research and application of the advanced composite represent thedevelopment level of a nation’s science and technology. Especially in aircraft industry,various kinds of advanced aircraft are closely related to advanced materials technology.As the application of composite increases in aircraft industry, advanced digital designmanufacturing technology and computer aided engineering (CAE) technology havebeen widely applied in composite manufacturing field.This research use our special skill to study the efficiency of the braided laminatedcomposite of a CKFR-PMCs, with the national/industry standard as a benchmark, thelarge commercial finite element software ABAQUS as modeling computing platforms,the Python language script parameter to design language. The study has established thelayer structure representative volume unit (RVE) and related sample numerical modelsof mechanical properties test, including the basic mechanical tests of composite such asextrusion/compression test, shear test, flexural performance test, interplay shearstrength test,and longitudinal transverse shear test.The study applies Python languageto program and achieves to control the portion of the fiber volume fraction in braidedlaminated composite finite element models and the conversion of the output variablesof the anisotropic material from the local coordinate system to global coordinatesystem. What’s more, the study also makes an inverse prediction of the performance ofthe carbon/Kevlar fiber and matrix materials in the layers of braided laminatedcomposite and calculates the performance of the composite containing40%fiber.This paper gives a more complete idea and method to predict the mechanicalproperty of the braided laminated composite. The results also can be applied into theprediction of different properties of the fiber, matrix materials, different fiber volumefraction content, and different fiber laying layer angles, different loading directions offiber reinforced materials and the mechanical performance of the braided laminatedcomposite. It will also offer some numerical preparation and method to carry outfurther multi-scale and cross-scale research on the braided laminated composite.更多还原