基于降阶均匀化理论的混凝土双尺度力学性能分析

发布时间：2018-05-19 07:17

本文选题：混凝土 + 降阶均匀化理论　；参考：《计算力学学报》2016年06期

【摘要】：混凝土材料细观特性对宏观力学性能有着重要影响。为进一步分析混凝土细观特性对宏观力学行为的影响规律,将混凝土材料简化为由骨料、砂浆和界面三相组成,编制了随机凸多面体骨料生成、投放和网格剖分算法,建立可用于有限元计算的满足级配要求的随机细观模型。针对直接使用细观力学模型计算量较大的问题,采用降阶均匀化理论,对混凝土细观胞元模型进行预处理并编制了相应的双尺度计算程序。对不同强度混凝土进行了单轴静态压缩双尺度计算,与实验数据和细观力学模拟结果符合较好。研究表明,降阶均匀化理论在加快求解速度的同时具有较高的精度,可以用于混凝土的多尺度力学性能分析。
[Abstract]:The meso-properties of concrete have an important effect on the macro-mechanical properties. In order to further analyze the influence of concrete meso characteristics on macroscopic mechanical behavior, the concrete material is simplified into three phases composed of aggregate, mortar and interface, and an algorithm for generating, dropping and mesh generation of random convex polyhedron aggregate is developed. A stochastic mesoscopic model, which can be used for finite element calculation, is established to meet the requirements of gradation. In order to solve the problem of large amount of calculation by using the meso-mechanical model directly, the reduced order homogenization theory is used to preprocess the meso-cellular model of concrete and the corresponding two-scale calculation program is compiled. The uniaxial static compression biaxial calculation of concrete with different strength is carried out, which is in good agreement with the experimental data and the results of meso-mechanical simulation. The results show that the reduced order homogenization theory has high accuracy and can be used to analyze the multi-scale mechanical properties of concrete.
【作者单位】：南京理工大学智能弹药技术国防重点学科实验室;解放军理工大学爆炸冲击防灾减灾国家重点实验室;
【基金】：爆炸冲击防灾减灾国家重点实验室(解放军理工大学)开放基金(DPMEIKF201405)资助项目
【分类号】：TU528

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