基于DIGIMAT的碳纤维增强环氧树脂编织复合材料的力学性能  

Mechanical properties of carbon fiber reinforced epoxy resin woven composites based on DIGIMAT

作　　者：段成红[1] 吴港本 罗翔鹏[1] DUAN Chenghong;WU Gangben;LUO Xiangpeng(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《纺织学报》2023年第7期126-131,共6页Journal of Textile Research

摘　　要：为准确预测不同编织工艺参数下编织复合材料的等效弹性性能,拓宽碳纤维增强环氧树脂编织复合材料的应用领域。建立了考虑随纤维路经产生扭结缺陷的二维三轴编织复合材料的代表性体积单元(RVE),并基于平均场均匀化方法,利用DIGIMAT预测复合材料的等效弹性模量,分析不同编织角对编织复合材料等效工程常数的影响规律;其次基于强度失效准则,预测编织复合材料在单轴拉伸加载情况下的力学性能;最后通过数值模拟获得编织复合材料RVE的应力与应变。结果表明:预测的编织参数对等效工程常数的影响规律与试验测量一致,获得的应力、应变可为进一步研究其损伤破坏行为提供参考。Objective Braided composites have many advantages such as high specific strength,high specific stiffness,high impact damage tolerance and designable mechanical properties,and have been widely used in aerospace,machinery and other fields,and it is particularly important to optimize or design their mechanical properties.In this paper,based on a new composite simulation software DIGIMAT,a representative volume element(RVE)considering the kink defects of fiber bundles with fiber path is established to accurately and quickly predict the equivalent elastic properties of the material at different braiding angles and to explore the influence of the weaving angle on them;and then the stress distribution of two-dimensional triaxially braided composite RVE is obtained to provide a basis for further study of its damage and failure.Method Although the internal structure of two-dimensional triaxially braided composites is relatively complex,it has a certain periodic distribution on the mesoscale.Therefore,an RVE considering the kink defects caused by fiber bundles along the fiber path was established by using the nonlinear composite modeling platform DIGIMAT,and the equivalent elastic properties of materials were predicted based on the DIGIMAT-MF module mean field homogenization method.Based on the strength failure criterion,the DIGIMAT-FE module was adopted to predict the mechanical properties of braided composites with different braiding angles under uniaxial tensile loading(peak strain of 0.5%).Results The equivalent engineering constants of two-dimensional triaxial braided composite RVE were predicted with the longitudinal tensile modulus E1 of 48.33 GPa,the transverse tensile modulus E_(2) of 6.70 GPa,and the longitudinal Poisson′s ratioμ_(12) of 0.71,the transverse Poisson′s ratioμ23 of 0.45,and the shear modulus G_(12) of 6.77 GPa.In addition,nine braiding angles of 15°,19°,23°,27°,30°,35°,37°,41°and 45°were selected to analyze their influence on the equivalent engineering constant.The longitudinal tensil

关 键 词：编织复合材料 力学性能 代表性体积单元 DIGIMAT 编织角 

分 类 号：TB332[一般工业技术—材料科学与工程]