A novel damage model based on micromechanics for hybrid fiber reinforced cementitious composites under uniaxial compression
A novel damage model based on micromechanics for hybrid fiber reinforced cementitious composites under uniaxial compression
复制标题
基于微观力学的混合纤维增强水泥基复合材料单轴压缩损伤模型
DOI：
10.1177/1056789518813270
复制
发表时间：
2018-11
影响因子：
4.2
通讯作者：
Zhiguo Yan
中科院分区：
文献类型：
--
作者：
Yao Zhang;J Woody Ju;Hehua Zhu;Qing Chen;Qinghua Guo;Zhiguo Yan
提出了一种基于细观力学的混杂纤维增强水泥基复合材料单轴压缩损伤模型。在该模型中，提出了一种用于预测混杂纤维增强水泥基复合材料整体弹性性能的多层均匀化方法。为了考虑微裂纹对其宏观柔度的贡献，将混杂纤维增强水泥基复合材料等效为微裂纹弱化的固体，其总体柔度由基质的柔度和由滑动、扩展和扭结裂纹引起的附加柔度组成。基于微裂纹的平均滑动位移远小于增强纤维长度的实际情况，简化了混杂纤维对裂纹扩展的桥联作用。文中详细讨论了载荷作用下微裂纹滑动、扩展和扭结的演化区域。此外，通过引入两个函数，考虑了纤维几何参数、微裂纹密度和最近的具有相同取向角度的微裂纹之间的距离对压缩行为的影响，揭示了纤维对压缩行为的弱化效应。演化损伤模型的模拟结果与纤维增强水泥基复合材料和混杂纤维增强不同纤维含量水泥基复合材料的实验数据吻合较好。新的细观损伤模型有助于阐明混杂纤维增强和弱化的机理。
A novel damage model based on micromechanics is proposed for hybrid fiber reinforced cementitious composites under uniaxial compression. In this model, a multilevel homogenization method is presented to predict the overall elastic properties of hybrid fiber reinforced cementitious composites. To account for the contribution of microcracks on its macrocompliance under compression, hybrid fiber reinforced cementitious composite is considered equivalent to the microcrack-weakened solid, whose overall compliance consists of the compliance of the matrix and the additional compliance by sliding, propagating and kinking cracks. The bridging effects of hybrid fibers on restraining crack growth are simplified based on the reality that the average sliding displacement of microcracks is much less than the length of reinforcing fibers. The evolutional domains of microcrack growth under loads where the microcracks are sliding, propagating and kinking are discussed in detail. In addition, the weakening effects of fibers upon compressive behavior are captured by introducing two functions, which consider the influences of fiber geometrical parameters, the microcrack density and the distance between two nearest microcracks with the same oriented angle. Simulation results by our evolutionary damage model render reasonable agreements with available experimental data of fiber reinforced cementitious composites and hybrid fiber reinforced cementitious composites with various fiber contents. The new micromechanical damage model would be beneficial to elucidating the strengthening and weakening mechanisms of hybrid fiber reinforcement.
登录
查看更多内容
影响因子：
3.2
作者：
Olivér Czoboly;G. Balázs
通讯作者：
Olivér Czoboly;G. Balázs
DOI：
10.1590/s1516-14392013005000181
发表时间：
2013-11
影响因子：
1.7
作者：
P. L. Lima;R. D. T. Filho;J. M. Filho
通讯作者：
P. L. Lima;R. D. T. Filho;J. M. Filho
DOI：
10.1201/9781482296549
发表时间：
2009-03
期刊：
--
影响因子：
--
作者：
R. Swamy;B. Barr
通讯作者：
R. Swamy;B. Barr
影响因子：
10.5
作者：
Sivakumar, A.;Santhanam, Manu
通讯作者：
Santhanam, Manu
基于微观力学的混合纤维增强复合材料单轴拉伸等效弹塑性损伤模型
影响因子：
4.2
作者：
Zhiguo Yan;Yao Zhang;J Woody Ju;Qing Chen;Hehua Zhu
通讯作者：
Hehua Zhu