大直径SHTB实验装置数值模拟及混凝土细观骨料模型动态直拉研究

郭瑞奇; 任辉启; 龙志林; 吴祥云; 姜锡权

doi:10.11883/bzycj-2020-0015

大直径SHTB实验装置数值模拟及混凝土细观骨料模型动态直拉研究

doi: 10.11883/bzycj-2020-0015

郭瑞奇^{1, 2,},
任辉启²,
龙志林^1, ,,
吴祥云²,
姜锡权³

1.
湘潭大学土木工程与力学学院，湖南湘潭 411105
2.
军事科学院国防工程研究院，河南洛阳 471023
3.
合肥姜水动态力学实验技术有限公司，安徽合肥 230031

基金项目: 国家自然科学基金(51971188, 51071134)；湖南省科技重大专项(2019GK1012)；湖湘高层次人才聚集工程创新团队(2019RS1059)；湖南省研究生科研创新项目(CX2018B389)

详细信息

作者简介:
郭瑞奇（1993－　），男，博士研究生，grq_xtu@126.com

通讯作者:
龙志林（1965－　），男，博士，教授，博士生导师，longzl@xtu.edu.cn

中图分类号: O347.1
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- 被引次数: 0
出版历程
- 收稿日期: 2020-01-07
- 修回日期: 2020-04-01
- 网络出版日期: 2020-08-25
- 刊出日期: 2020-09-01

Numerical simulation on a large diameter SHTB apparatus and dynamic tensile responses of concrete based on mesoscopic models

GUO Ruiqi^{1, 2
,},
REN Huiqi²,
LONG Zhilin^{1
, ,},
WU Xiangyun²,
JIANG Xiquan³

1.
Civil Engineering and Mechanics College, Xiangtan University, Xiangtan 411105, Hunan, China
2.
National Defense Engineering Institute, Academy of Military Science of PLA, Luoyang 471023, Henan, China
3.
Hefei Jiangshui Dynamic Mechanical Experimental Technique Co. Ltd, Hefei 230031, Anhui, China

摘要

摘要: 对混凝土材料在高应变率下的动态拉伸实验多以劈裂和层裂的形式进行，然而它们作为间接研究混凝土动态拉伸性能的实验技术具有一定的局限性，亟需使用大直径分离式Hopkinson拉杆（split Hopkinson tensile bar，SHTB）设备对混凝土进行动态直拉实验。因此，运用数值模拟方法对一种新型的霍普金森拉杆的入射波进行了研究，并对设备的局部构件进行改进，使其不仅具有对混凝土试件的胶粘连接方式，也可通过螺纹连接配套夹具以同时兼顾挂接等其他连接方式。针对改进后的SHTB装置，建立了圆环状三维混凝土细观骨料模型。通过数值模拟与实验结果的对比，验证了采用空心圆管式SHTB装置的有效性，并为混凝土细观骨料模型的动态拉伸模拟提供了思路。
- SHTB /
- 混凝土 /
- 动态拉伸 /
- 应变率 /
- 细观建模
Abstract: Research of concrete materials subjected to tensile stress wave at high strain rates is currently based on splitting experiments and spalling experiments with a split Hopkinson pressure bar device, however, they are not appropriate to study the stress-strain relationship of concrete materials subjected to one dimensional tensile stress wave. Therefore, the large diameter split Hopkinson tensile bar (SHTB) is urgently needed to perform direct dynamic tensile study of concrete materials. Mechanical analysis of a new type of SHTB apparatus was performed in numerical simulation method, then corresponding incident tensile stress wave was studied and optimize improvement measures for partial components were also proposed. The partly improved SHTB apparatus reconciled the demands of glued connect mode, hooked connect mode and so on. At last, concrete was considered as a two-phase composite material which composed of coarse aggregates and cement matrix, the annulus three-dimensional concrete aggregate model was established and applied to SHTB simulation experiment. The comparison between numerical simulation results and experimental results verified the effectiveness of partly improved SHTB apparatus, which also provided research directions for dynamic tensile responses of mesoscopic concrete model.
- SHTB /
- concrete /
- dynamic tensile /
- strain rate /
- mesoscale modeling

HTML全文

图 1 使用Hopkinson压杆设备对混凝土材料进行动态拉伸实验^{[4, 10]}

Figure 1. Dynamic tensile experiments of concrete materials with Hopkinson pressure bar apparatus^{[4, 10]}

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图 2 使用实心子弹撞击空心入射管封头部位来产生拉伸波的大直径SHTB设备

Figure 2. Large diameter SHTB apparatus utilizing a solid bullet to strike end cap for generation of tensile stress wave

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图 3 大直径SHTB设备几个部位实物图

Figure 3. Photographs of several parts of large diameter SHTB device

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图 4 使用四面体单元划分的杆件以及使用“背景网格映射法”建立的混凝土细观骨料模型

Figure 4. Member bars meshed with tetrahedron elements and mesoscale concrete model established in background grid mapping method

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图 5 入射杆和透射杆的轴向应力云图

Figure 5. Axial stress distribution in incident and transmitted bars

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图 6 入射杆和透射杆上的应力波形

Figure 6. Stress waveforms in incident and transmitted bar

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图 7 大直径SHTB设备各部位的有限元模型

Figure 7. Finite element models for several parts of the large-diameter SHTB apparatus

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图 8 子弹撞击倒锥形封头计算结果

Figure 8. Calculation results for the bullet striking the reverse taper-shaped end cap

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图 9 销钉最大主应力云图

Figure 9. Maximum principal stress nephograms of dowels

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图 10 销钉受力情况

Figure 10. Stresses born by dowels

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图 11 大直径SHTB设备中的拉伸波形

Figure 11. Tensile stress waveforms in the large diameter SHTB apparatus

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图 12 应力波通过销钉前后的应力云图

Figure 12. Stress nephograms of the wave propagation process around the dowels part

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图 13 紫铜整形器有限元模型剖视图

Figure 13. Sectional drawing of the finite element model for the red copper pulse shaper

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图 14 整形后入射管和入射杆中的拉伸波形

Figure 14. Shaped tensile waveforms in incident tube and incident bar

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图 15 局部改进的大直径SHTB设备

Figure 15. Partly improved large diameter SHTB apparatus

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图 16 使用背景网格映射法建立的混凝土细观骨料模型

Figure 16. Mesoscale concrete models established by the background grid mapping method

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图 17 数值模拟应力波形与实验结果^[25]对比

Figure 17. Comparison between simulated and experimental^[25] waveforms

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图 18 圆环状混凝土试件数值模拟破坏结果与实验结果^[25]对比

Figure 18. Comparison between simulated and experimental^[25] phenomena

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