钢纤维混凝土冲击破坏特性GDEM软件模拟

张金; 戚志刚; 张磊

doi:10.21656/1000-0887.450311

钢纤维混凝土冲击破坏特性GDEM软件模拟

doi: 10.21656/1000-0887.450311

张金^{1, 2,},
戚志刚^{1, 2, 3},
张磊^{1, 2, ,}

1.
目标易损性评估全国重点实验室, 河南洛阳 471023
2.
军事科学院国防工程研究院, 河南洛阳 471000
3.
哈尔滨工程大学航天与建筑工程学院, 哈尔滨 150001

基金项目:

国家自然科学基金 12172381

中原领军人才项目 234200510016

详细信息

作者简介:
张金(1996—)，男，博士生(E-mail: 2743008270@qq.com)

通讯作者:
张磊(1974—)，男，研究员，博士(通讯作者. E-mail: ustczhanglei@163.com)

中图分类号: O331
计量
- 文章访问数: 46
- HTML全文浏览量: 14
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2024-11-18
- 修回日期: 2025-01-31
- 刊出日期: 2025-05-01

Impact Damage Characteristics Simulation of Steel Fiber Reinforced Concrete With the GDEM Software

ZHANG Jin^{1, 2
,},
QI Zhigang^{1, 2, 3},
ZHANG Lei^{1, 2
, ,}

1.
State Key Laboratory of Target Vulnerability Assessment, Luoyang, Henan 471023, P.R.China
2.
Institute of Defense Engineering, AMS, Luoyang, Henan 471000, P.R.China
3.
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, P.R.China

摘要

摘要: 钢纤维混凝土(steel fiber reinforced concrete，SFRC)是防护工程中最常用的结构材料，在爆炸、侵彻等强动载作用下，其往往处于高应变率的复杂应力状态. 目前，关于SFRC的动态力学性能的研究大多局限于一维应力和一维应变加载条件下，而关于三向应力状态下的冲击压缩特性研究较少. 该文采用基于连续-非连续介质力学的数值仿真软件GDEM-BlockDyna，模拟了围压对SFRC动态力学性能和破坏模式的影响. 结果表明：围压下SFRC的峰值应力和峰值应变均随着应变率的提高有不同程度的增大，但围压会抑制SFRC冲击压缩强度的率效应. GDEM能较逼真地模拟应变率和围压对材料动态力学的影响，与有限元方法相比，GDEM能够更好地模拟SFRC从完整到破坏的过程及特征，且对SFRC峰值应力后的破坏阶段的描述模拟更加准确.
- 钢纤维混凝土 /
- 主动围压 /
- GDEM /
- 有限元方法 /
- HJC模型
Abstract: Steel fiber-reinforced concrete (SFRC) is the most utilized structural material for protective engineering. It is frequently subjected to complex stress states with high strain rates under strong dynamic loads, such as explosions and penetrations. Most current studies on the dynamic mechanical properties of SFRC are limited to 1D stress and 1D strain loading conditions. However, the impact-compression characteristics under 3D stress states are still scarce. Herein the GDEM-BlockDyna numerical simulation software was employed to simulate the damage modes of SFRC under confining pressures and investigate the concrete dynamic mechanical properties. The results indicate that, the peak stress and peak strain of SFRC both increase to different extents with the strain rates. The confining pressure reduces the rate effect on the impact compression strength of SFRC. The GDEM can realistically simulate the effects of strain rate and confining pressure on the dynamic mechanics of materials. In comparison to the finite element method, the GDEM is more effective in simulating the behaviors of steel fiber reinforced concrete, from its intact state to destruction. Furthermore, the GDEM can accurately describe the destruction stage characteristics of SFRC after the peak stress.
- steel fiber reinforced concrete /
- active confining pressure /
- GDEM /
- finite-element method /
- HJC model

HTML全文

图 1 CDEM中数值模型的构成^[22]

Figure 1. Composition of numerical models in the CDEM^[22]

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图 2 模拟计算两阶段

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 2. Two phases of simulation

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图 3 SFRC动态单轴压缩损伤云图

Figure 3. Dynamic uniaxial compression damage contours for SFRC

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图 4 C60-SFRC单轴冲击破坏模拟损伤结果云图与文献结果^[24]

Figure 4. SFRC uniaxial impact damage simulation damage result contours and experimental results^[24]

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图 5 围压下SFRC损伤云图

Figure 5. SFRC damage contours under circumferential pressure

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图 6 入射波-透射波波形和应力平衡

Figure 6. Incident-transmitted waveforms and stress balance diagrams

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图 7 围压下典型的SFRC应力-应变曲线

Figure 7. Typical SFRC stress-strain curves under circumferential pressure

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图 8 不同围压下应变率对C15-SFRC应力-应变曲线影响规律

Figure 8. Influences of strain rates on stress-strain curves of C15-SFRC under different confining pressures

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图 9 不同围压下应变率对C80-SFRC应力-应变曲线影响规律

Figure 9. Influences of strain rates on stress-strain curves of C80-SFRC under different confining pressures

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图 10 三种围压下$\operatorname{SFRC} \lg \left(\xi_{\text {DIF }}\right)-\lg \left(\dot{\varepsilon} / \varepsilon_{\mathrm{s}}\right)$ 拟合曲线

Figure 10. SFRC $\lg \left(\xi_{\text {DIF }}\right)-\lg \left(\dot{\varepsilon} / \varepsilon_{\mathrm{s}}\right)$ fitting curves under 3 types of confining pressures

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图 11 三种围压下$\lg \left(\xi_{\text {DIF }}\right)-\lg \left(\dot{\varepsilon} / \varepsilon_{\mathrm{s}}\right)$ 拟合曲线

Figure 11. Fitted curves of $\lg \left(\xi_{\text {DIF }}\right)-\lg \left(\dot{\varepsilon} / \varepsilon_{\mathrm{s}}\right)$ at 3 confining pressures

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图 12 有限元结果与GDEM模拟结果对比

Figure 12. Comparison between finite element results and GDEM simulation results

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图 13 C60-SFRC实验结果、有限元结果、GDEM软件数值仿真结果对比

Figure 13. Comparison of C60-SFRC experimental results, finite element results and GDEM software numerical results

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表 1 SFRC基本力学参数

Table 1. Basic mechanical parameters of specimens

serial number	density/(g·cm^-3)	elastic modulus/GPa	Poisson’s ratio	cohesion/MPa	tensile strength/MPa	internal friction angle/(°)	swelling angle/(°)
C15	2 480	21.8	0.23	10	1.57	36.5	0
C30	2 500	38	0.21	27	4.19	37.4	0
C60	2 636	44	0.20	32	5.49	37.9	0
C80	2 645	48	0.19	45	8.34	38.9	0

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表 2 SFRC-HJC参数

Table 2. Steel fiber reinforced concrete HJC parameters

serial number	ρ	G/Pa	A	B	C	N	f_c/Pa	T/Pa	EFMIN	S_max
C15	2 480	8.9E9	0.79	1.6	0.007	0.61	1.9E7	1.5E6	0.01	7
C30	2 500	1.5E10	0.79	1.6	0.007	0.61	5.0E7	4.2E6	0.01	7
C60	2 636	1.8E10	0.79	1.6	0.007	0.61	6.6E7	5.5E6	0.01	7
C80	2 645	2.0E10	0.79	1.6	0.007	0.61	1.0E8	8.3E6	0.01	7

serial number	P_crush/Pa	μ_crush	P_lock/Pa	μ_lock	D₁	D₂	K₁/Pa	K₂/Pa	K₃/Pa
C15	6.3E6	0.001	6.0E8	0.1	0.04	1	8.5E10	-1.71E11	2.08E11
C30	1.6E7	0.001	1.0E9	0.1	0.04	1	8.5E10	-1.71E11	2.08E11
C60	2.2E7	0.001	1.2E9	0.1	0.04	1	8.5E10	-1.71E11	2.08E11
C80	3.3E7	0.001	1.3E9	0.1	0.04	1	8.5E10	-1.71E11	2.08E11

下载: 导出CSV

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