混凝土类材料动态拉伸实验中惯性效应的研究

doi:10.16182/j.issn1004731x.joss.201707018

摘要/Abstract

摘要： 目前研究者对于惯性效应在动态拉伸强度中的影响持不同观点,尚没有定论。基于此,利用有限元数值模拟,在不考虑真实应变率效应影响的情况下,采用计及静水压力影响的本构关系模型对动态直接拉伸模型、劈裂实验及层裂实验模型中的试样进行分析。最终发现：混凝土类材料试样由惯性效应产生的动态拉伸强度增强虽然会随着加载应变率的增大而提高,但与相应实验中不同应变率下动态拉伸强度增强的数据相比,其增加量相对实验结果而言很小。因此,惯性效应并不是引起混凝土类材料动态拉伸强度增大的主要原因,其主导因素是真实应变率效应。。

关键词: 混凝土类材料, 拉伸强度, 惯性效应, 真实应变率效应, 数值模拟

Abstract: The different understanding on the influential degree of the inertial effect does exist among researchers, and it has not been uniformly defined in dynamic tensile tests. The finite element numerical simulation method was employed to analyze the three typical dynamic tensile tests, without considering the real strain-rate effect in these models, where a constitutive model only considered the influence of hydrostatic pressure was used for modeling the specimen in these models. It is found that the dynamic tensile strength of concrete specimens in the three models mentioned is strengthened with the increase of loading strain-rate, owing to the inertial effect, while the increments of dynamic tensile strength obtained from these numerical tests are relatively small, compared with the corresponding experimental data. It means that the real strain-rate effect rather than the inertial effect is the main factor leading to the dynamic tensile strength enhancement of concrete-like materials.

Key words: concrete-like materials, tensile strength, inertial effect, real strain-rate effect, numerical simulation

中图分类号:

O347.3

张书, 卢玉斌, 赵冬梅, 陈兴. 混凝土类材料动态拉伸实验中惯性效应的研究[J]. 系统仿真学报, 2017, 29(7): 1531-1538.

Zhang Shu, Lu Yubin, Zhao Dongmei, Chen Xing. Inertia Effect in Dynamic Tensile Tests of Concrete-like Materials[J]. Journal of System Simulation, 2017, 29(7): 1531-1538.

参考文献

[1] 张凯, 陈荣刚, 张威, 等. 混凝土动态直接拉伸实验技术研究[J]. 实验力学, 2014, 29(1): 89-96.
(Zhang K, Chen R G, Zhang W, et al.Study of Experimental Technique for Concrete Dynamic Direct tension[J]. Journal of Experimental Mechanics, 2014, 29(1): 89-96.)
[2] Zhang M, Wu H J, Li Q M, et al.Futher investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. part I: Experiments[J]. International Journal of Impact Engineering (S1025-2495), 2009, 36(12): 1327-1334.
[3] 张书, 卢玉斌. 混凝土SHPB实验中惯性效应的机理及其影响因素研究[J]. 兵工学报, 2014, 35(增2): 281-287.
(Zhang S, Lu Y B.Research on the mechanism of inertial effect and its influencing factors in SHPB tests of concrete[J]. Acta Armamentarii, 2014, 35(S2): 281-287.)
[4] Cadoni E, Solomos G, Albertini C.Mechanical characterisation of concrete in tension and compression at high strain rate using a modified Hopkinson bar[J]. Magazine of Concrete Research (S0024-9831), 2009, 61(3): 221-230.
[5] Klepaczko J R, Brara A.An experimental method for dynamic tensile testing of concrete by spalling[J]. International Journal of Impact Engineering (S1025-2495), 2001, 25(4): 387-409.
[6] Brara A, Klepaczko J R.Experimental characterization of concrete in dynamic tension[J]. Mechanics of Materials (S0191-5665), 2006, 38(3): 253-267.
[7] Lu Y B, Li Q M.About the dynamic uniaxial tensile strength of concrete-like materials[J]. International Journal of Impact Engineering (S1025-2495), 2011, 38(4): 171-180.
[8] 卢玉斌, 武海军, 赵隆茂. 混凝土类材料动态拉伸强度的微观力学模型[J]. 爆炸与冲击, 2013, 33(3): 275-281.
(Lu Y B, Wu H J, Zhao L M.A micro-mechanical model for dynamic tensile strength of concrete-like materials[J]. Explosion and Shock Waves, 2013, 33(3): 275-281.)
[9] Cotsovos D M, Pavlovic M N.Numerical investigation of concrete subjected to compressive impact loading, Part 2: parametric investigation of factors affecting behavior at high loading rates[J]. International Journal of Impact Engineering (S1025-2495), 2008, 35(5): 319-335.
[10] Hao Y, Hao H, Zhang X H.Numerical analysis of concrete material properties at high strain rate under direct tension[J]. International Journal of Impact Engineering (S1025-2495), 2012, 39(1): 51-62.
[11] 张书, 卢玉斌. 准静态一维应变实验装置的设计与验证研究[J]. 实验力学, 2015, 30(3): 313-321.
(Zhang S, Lu Y B.On the design and validation of quasi-static one-dimensional strain experimental device[J]. Journal of Experimental Mechanics, 2015, 30(3): 313-321.)
[12] 王勇华. 活性粉末混凝土冲击压缩性能研究 [D]. 北京: 北京交通大学, 2007.
(Wang Y H.Study on the impact compressive behavior of reactive powder concretes [D]. Beijing, China: Beijing Jiaotong University, 2007.)
[13] ABAQUS Inc.ABAQUS Theory Manual (version 6.7-1) (Z). USA: ABAQUS Inc, 2007.
[14] 刘金龙, 栾茂田, 许成顺, 等. Drucker-prager准则参数特性分析[J]. 岩石力学与工程学报, 2006, 25(增2): 4009-4015.
(Liu J L, Luan M T, Xu C S, et al.Study on parametric characters of Drucker-Prager criterion[J]. Chinese Journal of Rock Mechanics and Engineering, 2006, 25(S2): 4009-4015.)
[15] Li Q M, Lu Y B, Meng H.Further investigation on the dynamic compression strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part II: Numerical simulations[J]. International Journal of Impact Engineering (S1025-2495), 2009, 36(12): 1335-1345.
[16] Noble C, Kokko E, Darnell I, et al.Concrete model description and summary of benchmark studies for blast effects simulations [R]// No. UCRL-TR-215024: U.S, Department of Energy Report, 2005. USA: US Department of Energy, 2005.
[17] Zhang M, Wu H J, Li Q M, et al.Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. part I: experiments[J]. International Journal of Impact Engineering (S1025-2495), 2009, 36(12): 1327-1334.
[18] Tedesco J W, Ross C A, Mcgill P B, et al.Numerical analysis of high strain rate concrete direct tension tests[J]. Computer and structure (S0045-7949), 1991, 40(2): 313-327.
[19] Tedesco J W, Ross C A, Brunair R M.Numerical analysis of dynamic split cylinder tests[J]. Computer and structure (S0045-7949), 1989, 32(3/4): 609-624.
[20] Cai M, Kaiser P K, Suorineni F, et al.A study on the dynamic behavior of the Meuse/Haute-Marne argillite[J]. Physics and Chemistry of the Earth (S1474-7065), 2007, 32(8/14): 907-916.
[21] Schuler H, Maythofer C, Thoma K.Spall experiments for the measurement of the tensile strength and fracture energy of concrete at high strain rate[J]. International Journal of Impact Engineering (S1025-2495), 2006, 32(10): 1636-1650.
[22] Gálvez Díaz-Rubio F, Rodríguez Pérez J, Sánchez Gálvez V. The spalling of long bars as a reliable method of measuring the dynamic tensile strength of ceramics[J]. International Journal of Impact Engineering (S1025-2495), 2002, 27(2): 161-177.
[23] Wu H J, Zhang Q M, Huang F L, et al.Experimental and numerical investigation on the dynamic tensile strength of concrete[J]. International Journal of Impact Engineering (S1025-2495), 2005, 32(1/4): 605-617.
[24] 刘智光. 混凝土破坏过程细观数值模拟与动态力学特性机理研究 [D]. 大连: 大连理工大学, 2012.
(Liu Z G.Research on fracture simulation and dynamic behavior of concrete [D]. Dalian, China: Dalian University of Technology, 2012.)
[25] Hao Y, Hao H, Li Z X.Influence of end friction confinement on impact tests of concrete material at high strain rate[J]. International Journal of Impact Engineering (S1025-2495), 2013, 60(60): 82-106.