摘要
基于有限元计算细观力学方法(finite element computational micromechanics,FECM),通过对C/Si C复合材料的C纤维束截面的实测,建立了六边形排列的代表特征体元(representative volume element,RVE)三维有限元模型。通过采用具有环向裂纹以及平行裂纹的两种C纤维束RVE有限元模型进行计算和分析,得出C纤维束的就位模量的决定因素包括初始的基体裂纹以及C纤维的就位性能。通过引入裂纹影响的折减系数,以及C纤维就位性能的折减系数,得到了C纤维束的5个就位模量,其中轴向就位模量与试验值十分接近,而其余4个就位模量还有待试验值的检验。
Based on the methods of finite element computational micromechanics(FECM),a three-dimensional finite element model of hexagonal arrangement is established by measuring the cross-section of carbon fiber bundle of C/SiC composite.The representative volume element(RVE)finite element model of two kinds of carbon fiber bundles with circular cracks and parallel cracks are calculated and analyzed,and the determining factors of in-situ modulus which including the initial matrix crack and the carbon fiber in-situ performance are gotten.By introducing the crack reduction coefficient ofλcrack and carbon fiber reduction coefficient ofλin,the five in-situ modulus of carbon fiber bundle are obtained.The calculated values of axial in-situ modulus of carbon fiber bundle are close to the test values,and the other four in-situ modulus are still to be tested.
作者
郝红武
张伟
吕毅
赵慧
HAO Hong-wu;ZHANG Wei;Lü Yi;ZHAO Hui(School of Aerocraft Engineering,Xi'an Aeronautical University,Xi'an 710077,China;Laboratory of Science and Technology on UAV,Northwestern Polytechnical University,Xi'an 710072,China)
出处
《科学技术与工程》
北大核心
2018年第11期209-214,共6页
Science Technology and Engineering
基金
陕西省自然科学基金(2016JQ1043)
西安航空学院校级科研基金(2016KY1101)资助
作者简介
第一作者:郝红武(1964—),男,副教授。研究方向:飞机结构强度和复合材料力学行为的表征。E-mail:haohongwu@aliyun.com。
