作　　者： ; ; ; ; ;

机构地区： 北京航空航天大学航空科学与工程学院

出　　处： 《复合材料学报》 2014年第4期1053-1062,共10页

摘　　要： 为研究单丝复合体系在单向加载过程中的应力传递及损伤演化规律,基于剪滞模型建立了渐进损伤过程的三维数值分析模型。单丝复合体系的渐进损伤过程曲线和临界状态下的纤维段数、应变载荷及纤维轴向应力分布均与文献试验结果非常吻合,表明本文所提出的单丝复合体系渐进损伤模型能够有效模拟单丝断裂过程中的损伤起始、损伤演化和断裂临界状态。研究了模型中组分材料的模量和强度对损伤过程的影响。结果表明:保持组分材料强度不变,增加纤维的模量能够加快损伤过程,基体模量和界面模量的增加对单丝复合体系渐进损伤过程影响不大;在组分材料模量及界面强度不变的情况下,随着纤维强度的增加,单丝复合体系渐进损伤过程的起始应变载荷和临界应变载荷均增加,临界状态下的纤维断点数减少。 In order to study stress transfer and damage evolution of single fiber composite in the process of unidirectional loading,a three-dimensional numerical analysis model of progressive damage process based on shear-lag model was established.The curves of single fiber composite progressive damage process,fiber segment,strain load and fiber axial stress distribution at the critical state are in good agreement with the test results in reference,which show that the model established in this paper could effectively simulate damage initiation,damage evolution and critical fracture state.The influences of constituent modulus and strength on damage process were also researched.The results show that increasing fiber modulus can speed up the damage process while maintaining constituent strength unchanged,and the increasing matrix and interfacial modulus have little effect on progressive damage process.Maintaining modulus of constituent materials and interfacial strength unchanged,with the increase of fiber strength,both the initial and critical strain load of single fiber composite progressive damage process increase,and the fiber breaking point at the critical state reduces.

关 键 词： 单丝复合体系 渐进损伤 剪滞模型 界面强度 损伤过程

领　　域： [一般工业技术]