Numerical investigation of concrete subjected to high rates of uniaxial tensile loading

Cotsovos, Demetrios M.; Pavlović, M.N.

doi:10.1016/j.ijimpeng.2007.03.006

Cited by 101 publications

(53 citation statements)

References 23 publications

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“…Hao et al (2013) investigated the effect of end friction on the dynamic compressive strength of concrete specimens, and found that the influence of end friction is related to the slenderness ratio of specimens. Cotsovos and Pavlović (2008) claimed that the dynamic tensile strength of concrete-like materials is directly linked to inertia effect, whose key influencing factors include the mass of specimens and boundary conditions. A similar argument was made by Hao et al (2012), who imposed a model with both strain-rate insensitive and sensitive feature in AUTODYN (a FEM software), and discovered that the inertia effect has a great on the dynamic tensile strength increment.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Hence, there is a risk of overestimating the strength gain if finite element codes calculate the failure of concrete by using both strain rate dependent strength increase factors and confining stresses due the inertia. Later studies 18,19 proved this point numerically, by modeling fictitious concrete specimens loaded under high strain rates and observing a strength increase with only considering the confining stresses due to the lateral inertia. The discussions on this subject are still premature, and more research is needed.…”

Section: Finite Element Modelingmentioning

confidence: 91%

Nonlinear Finite Element Modeling of Reinforced Concrete Structures under Impact Loads

2009

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“…A thorough bibliography of the abundant experimental data can be found 10,11 . A summary of the available experimental data is presented in Figs of compressive and tensile loading respectively, expressing the relationship between the DIF (dynamic increase factor, the ratio of the dynamic to static strength) and the strain rate.…”

Section: Determination Of Parameters 31 Strength Parametersmentioning

confidence: 99%

Determination and Validation of Parameters for Riedel-Hiermaier-Thoma Concrete Model

Ding¹,

Tang²,

Zhang³

et al. 2013

DSJ

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Numerical modelling of the complex physical processes such as concrete structures subjected to highimpulsive loads relies on suitable material models appropriate for impact and explosion problems. One of the extensive used concrete material models, the RHT model, contains all essential features of concrete materials subjected to high dynamic loading. However, the application of the RHT model requires a set of material properties and model parameters without which reliable results cannot be expected. The present paper provides a detailed valuation of the RHT model and proposes a method of determining the model parameters for C40 concrete. Furthermore, the dynamic compressive and tensile strength function of the model formulation are modified to enhance the performance of the model as implemented in the hydrocode AUTODYN. The performance of the determined parameters of the modified RHT model is demonstrated by comparing to available experimental data, and further verified via simulations of physical experiments of concrete penetration by steel projectiles. The results of numerical analyses are found closely match the penetration depth and the crater size in the front surface of the concrete targets.

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Numerical investigation of concrete subjected to high rates of uniaxial tensile loading

Cited by 101 publications

References 23 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

Nonlinear Finite Element Modeling of Reinforced Concrete Structures under Impact Loads

Determination and Validation of Parameters for Riedel-Hiermaier-Thoma Concrete Model

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