Dynamic behavior of concrete at high strain rates and pressures: II. numerical simulation

Park, S.W.; Xia, Qianxue; Zhou, Min

doi:10.1016/s0734-743x(01)00021-5

Cited by 113 publications

(48 citation statements)

References 22 publications

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“…As described in Park et al (2001), the D-P model can consider the dependence of flow stress on internal friction through pressure, strain hardening/softening and strain-rate sensitivity. In this study, since the yield behavior of concrete depends on the hydrostatic pressure, the D-P model is chosen to simulate concrete specimens.…”

Section: Parameters Of Numerical Simulationsmentioning

confidence: 99%

Further Investigation on the Real Rate Effect of Dynamic Tensile Strength for Concrete-Like Materials

Zhang

Chen

et al. 2016

Lat. Am. j. solids struct.

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Based on dynamic direct tensile tests, splitting tests and spalling tests, it is found that the experimental tensile strength of concrete-like materials greatly increases with loading-rate. This kind of dynamic tensile strength enhancement may be caused by the combination influence of the inertia effect, real rate effect and end friction effect (here the end friction effect is only existed in splitting and spalling tests). To further investigate the influence degree of real rate effect for concrete-like materials in dynamic tensile tests, this paper conducts systematically dynamic tensile experiments, viz. dynamic direct tensile tests, splitting tests and spalling tests. At the same time, numerical dynamic tensile tests are employed to analyze the mechanical characteristics of concrete-like materials. A hydrostatic pressure dependent model, the DruckerPrager constitutive model, is used for concrete-like material specimens, which can consider the influence of inertia effect. In the numerical model, the specimen is set to be rate-independent, thus the predicted dynamic tensile strength of specimens is free of the real rate effect. The end friction effect is also taken into account in the numerical analysis of dynamic splitting and spalling tests. It is found that the dynamic tensile strength of concrete-like materials in numerical simulations does not varies obviously with the loading-rate, indicating that the inertia effect and end friction effect have little contributions to the dynamic tensile strength enhancement of concrete-like materials. Therefore, the real rate effect dominates the dynamic tensile strength enhancement of concretelike materials in laboratory tests, but the inertia effect and end friction effect do not. Keywords Real rate effect, tensile strength, concrete-like materials, experimental and numerical research researchers. The dynamic behavior of concrete-like materials is usually studied by laboratory such as split Hopkinson tension bar (SHTB) or split Hopkinson pressure bar (SHPB). Many experimental results show that the dynamic strength of concrete-like materials subjected to impact loading increases apparently with the loading-rate. The influence of the loading-rate or strain-rate on the dynamic strength enhancement of concrete-like materials obtained from experiments is called as the apparent rate effect. The dynamic performance of mortar under compressive and tensile loading was studied by Yang et al. (2015) based on splitting tests, and the results show that mortar is of rate sensitive. Cai et al. (2015) systematically conducted quasi-static and dynamic compressive tests to analyze the rate effect of granite, and numerical simulation method is employed to determine the true rate effect of granite through the uncoupled assumption of the rate effect, lateral inertia and end friction effect in SHPB tests. Lu et al. (2014) investigated the dynamic compressive behavior of recycled aggregate concrete specimens prepared with five different amount of recycled coarse aggregate [i.e. 0, 25...

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Section: Parameters Of Numerical Simulationsmentioning

confidence: 99%

Further Investigation on the Real Rate Effect of Dynamic Tensile Strength for Concrete-Like Materials

Zhang

Chen

et al. 2016

Lat. Am. j. solids struct.

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“…8 Park et al (2001) showed that the response of mortar specimens is insensitive to K , and thus K =1 is used in this work.…”

Section: Article In Pressmentioning

confidence: 99%

“…Therefore, β =40° was used in the numerical simulations in the present study. Park et al (2001) found that ψ has limited influence on the specimen response in their simulation of plate impact of mortar. It is further proved that the influence of ψ on DIF in a SHPB test is almost negligible according to parametric studies in the present research.…”

Section: Article In Pressmentioning

confidence: 99%

Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part II: Numerical simulations

Meng³

2009

International Journal of Impact Engineering

159

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Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests Part II Numerical Simulations. International Journal of Impact Engineering, Elsevier, 2009, 36 (12) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. shows that it is necessary to use a kinetic friction model, rather than a constant friction model, for more accurate numerical simulation of SHPB tests. M A N U S C R I P T A C C E P T E D ARTICLE IN PRESS

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“…Numerical simulation, on the other hand, can reveal the stress and deformation details at micro-levels more easily. To date, a limited number of simulations on SHPB tests have been mainly about conventional SHPB with a cylindrical striker, and the simulation codes are usually finite element methods (Bertholf and Karnes 1975;Park et al 2001;Li and Meng 2003;Cotsovos and Pavlović 2008;Lu et al 2010;Zhu et al 2012). There are several drawbacks to these simulation works: (1) the presumed material constitutive relations should be given in advance, which causes the simulation to run as expected.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method

2013

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A split Hopkinson pressure bar (SHPB) system with a special shape striker has been suggested as the test method by the International Society for Rock Mechanics (ISRM) to determine the dynamic characteristics of rock materials. In order to further verify this testing technique and microscopically reveal the dynamic responses of specimens in SHPB tests, a numerical SHPB test system was established based on particle flow code (PFC). Numerical dynamic tests under different impact velocities were conducted. Investigation of the stresses at the ends of a specimen showed that the specimen could reach stress equilibrium after several wave reverberations, and this balance could be maintained well for a certain time period after the peak stress. In addition, analyses of the reflected waves showed that there was a clear relationship between the variation of the reflected wave and the stress equilibrium state in the specimen, and the turning point of the reflected wave corresponded well with the peak stress in the specimen. Furthermore, the reflected waves can be classified into three types according to their patterns. Under certain impact velocities, the specimen deforms at a constant strain rate during the whole loading process. Finally, the influence of the micro-strength ratio (s c =r c ) and distribution pattern on the dynamic increase factor (DIF) of the strength DIF were studied, and the lateral inertia confinement and heterogeneity were found to be two important factors causing the strain rate effect for rock materials.Keywords SHPB Á Special shape striker Á Discrete element method Á Strain rate effect Micro-strength ratio (ratio of contact-bond shear to normal strength) n Time-step N Current time-step DTðnÞ Interval time under time-step n(s) l Frictional coefficient at the specimen/bar interface

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Dynamic behavior of concrete at high strain rates and pressures: II. numerical simulation

Cited by 113 publications

References 22 publications

Further Investigation on the Real Rate Effect of Dynamic Tensile Strength for Concrete-Like Materials

Further Investigation on the Real Rate Effect of Dynamic Tensile Strength for Concrete-Like Materials

Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part II: Numerical simulations

Numerical Simulation of the Rock SHPB Test with a Special Shape Striker Based on the Discrete Element Method

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