混凝土三维细观模型的建模方法与力学特性分析

张煜航; 陈青青; 张杰; 王志勇; 李志强; 王志华

doi:10.11883/bzycj-2018-0408

混凝土三维细观模型的建模方法与力学特性分析

doi: 10.11883/bzycj-2018-0408

张煜航^{1, 2,},
陈青青^{1, 2},
张杰^{1, 2},
王志勇^{1, 2},
李志强^{1, 2},
王志华^{1, 2, ,}

1.
太原理工大学机械与运载工程学院应用力学研究所，山西太原 030024
2.
太原理工大学材料强度与结构冲击山西省重点实验室，山西太原 030024

基金项目: 国家自然科学基金（11390361，11390362，11702186）

详细信息

作者简介:
张煜航(1993－　)，男，博士研究生，zhangyh951000@163.com

通讯作者:
王志华(1977－　)，男，博士，教授，wangzh077@163.com

中图分类号: O383
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- 被引次数: 0
出版历程
- 收稿日期: 2018-10-26
- 修回日期: 2018-12-10
- 网络出版日期: 2019-04-25
- 刊出日期: 2019-05-01

3D mesoscale modeling method and dynamic mechanical properties investigation of concrete

ZHANG Yuhang^{1, 2
,},
CHEN Qingqing^{1, 2},
ZHANG Jie^{1, 2},
WANG Zhiyong^{1, 2},
LI Zhiqiang^{1, 2},
WANG Zhihua^{1, 2
, ,}

1.
Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
Shanxi Key Laboratory of Material Strength and Structural Impact, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

摘要

摘要: 根据混凝土材料的细观组成和结构特点，基于三维Voronoi图形提出了一种简单高效的混凝土细观模型生成方法，利用塑性损伤模型对该细观模型进行了单、多轴应力状态下的准静态分析以及SHPB动态有限元分析。结果表明，数值模拟得到的应力应变曲线和破坏模式与实验结果基本吻合，本文中提出的混凝土三维细观模型可较好地模拟混凝土的静、动态力学特性，为进一步从细观力学角度研究混凝土损伤演化规律和破坏机理提供了模型基础。
- 混凝土 /
- 三维细观模型 /
- Voronoi图形 /
- 黏接界面层 /
- 静力特性
Abstract: According to the mechanical properties and components of concrete from the mesoscale viewpoint, a simple and high-efficiency method based on 3D-Voronoi is proposed to construct realistic meso-structure model of concrete. In this paper, 3D mesoscale numerical simulation is conducted using damaged plasticity modeling under quasi-static and dynamic load. The simulation results resemble the corresponding experimental results both in strain-stress curves and failure modes. The current method can simulate static and dynamic mechanical properties well. In addition, the proved 3D model can provide an effective approach in elucidating fundamental mechanical behavior of concrete-like materials.
- concrete /
- 3D mesoscale model /
- Voronoi tessellation /
- interfacial transitional zone /
- static mechanical property

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图 1 K=0.2时三维Voronoi多面体

Figure 1. 3D Voronoi polyhedron when K=0.2

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图 2 骨料缩放示意图

Figure 2. Schematic diagram for single aggregate

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图 3 不同大小骨料模型

Figure 3. Aggregate cells with grading sizes

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图 4 ITZ产生示意图

Figure 4. Schematic diagram of generating ITZ

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图 5 具有不同ITZ厚度的骨料外轮廓图

Figure 5. Geometry outlines of different ITZ layer thicknesses

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图 6 含有不同骨料体积分数的立方体试样

Figure 6. Cubic specimens with different volume fractions of aggregate

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图 7 三维混凝土细观模型有限元模型

Figure 7. Meshing results for concrete specimen

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图 8 砂浆单轴准静态压缩应力应变曲线

Figure 8. Strain-stress curves of mortar phase under uniaxial load

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图 9 三维模型单轴加载示意图

Figure 9. 3D model for uniaxial quasi-static simulation

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图 10 单轴压缩与拉伸应力应变曲线

Figure 10. Comparison of strain-stress curves between experiment and simulation

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图 11 不同摩擦条件下试样破坏模式

Figure 11. Failure patterns of different frictional conditions

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图 12 单轴拉伸试样破坏模式

Figure 12. Failure patterns under uniaxial tension

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图 13 定测压加载示意图

Figure 13. 3D model under biaxial simulation

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图 14 双轴压缩应力应变曲线

Figure 14. Comparison of strain-stress curves between experiment and simulation

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图 15 不同侧向压应力下试样破坏模式

Figure 15. Failure patterns of different frictional conditions

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图 16 三轴压应力作用下应力应变曲线

Figure 16. Comparison of stress-strain curves between experiment and simulation

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图 17 不同应变率下的动态增强因子

Figure 17. Dynamic increasing factor for concrete at different strain rates

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图 18 不同应变率下混凝土试样破坏模式

Figure 18. Failure patternsat differentstrain rates

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表 1 细观组分材料参数

Table 1. Material parameters of three-phase materials

材料弹性模量/
GPa 泊松比抗压强度/
MPa 抗拉强度/
MPa

砂浆 25 0.20 35 3.5
ITZ 18 0.20 20 3.0
粗骨料 43 0.23 − −

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