About the dynamic uniaxial tensile strength of concrete-like materials

Lu, Yao; Li, Q.M.

doi:10.1016/j.ijimpeng.2010.10.028

Cited by 151 publications

(62 citation statements)

References 44 publications

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“…It is important to note, however, that when samples are allowed to deform laterally, extra lateral confinement due inertial effects contribute to the HSR response, and should be taken into account in interpretation of results. Erroneous interpretations of SHPB tests as a result of neglecting these inertial effects have been widely reported in the literature for other geomaterials such as concrete, as discussed by Li and Meng [60] and Lu and Li [100].…”

Section: Effect Of Lateral Confinementmentioning

confidence: 99%

Stress-strain behavior of sand at high strain rates

Omidvar

Iskander

Bless³

2012

International Journal of Impact Engineering

210

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Section: Effect Of Lateral Confinementmentioning

confidence: 99%

Stress-strain behavior of sand at high strain rates

Omidvar

Iskander

Bless³

2012

International Journal of Impact Engineering

210

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“…Many researchers focused on this critical strain rate and derived some classical equations (Ravichandran and Subhash 1994;Pan et al 2005). The inertia effect of the specimen is another factor that can enhance the rock strength (Li and Meng 2003;Li et al 2009;Lu and Li 2011). It is found that an appropriate length-to-diameter ratio can minimize the inertia effect effectively (Davies and Hunter 1963;Samanta 1971).…”

Section: Introductionmentioning

confidence: 99%

Determination of Dynamic Compressive and Tensile Behavior of Rocks from Numerical Tests of Split Hopkinson Pressure and Tension Bars

et al. 2016

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FEM-based numerical testing systems of the split Hopkinson pressure bar (SHPB) and the split Hopkinson tensile bar (SHTB) are established to study the characteristics of rock materials under dynamic compressive and tensile loadings. First of all, the accuracy and applicability of the numerical testing system are validated and calibrated through comparison between the laboratory measurements and the simulation results. Subsequently, the dynamic behavior of rock is analyzed in detail with the numerical testing system followed by the underlying physical mechanism. For the SHPB tests, the simulation results demonstrate that the incident waveform is determined by the striker length, the striker shape and the pulse shaper. The dynamic increase factor (DIF) of the rock specimen varies with different impact velocities, which is attributed to the strain rate effect. The rock specimen size and bar size also have effects on the DIF. In addition, the interfacial friction between the rock specimen and the bars cannot be ignored. For the SHTB tests, it is found that the incident waveform is dependent on the striker tube length and the striker tube thickness. In addition, similar to the SHPB tests, the impact velocity, rock specimen size and bar size all have strong effects on the rock dynamic tensile strength.

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“…However, Hentz et al (2004) used a discrete element method to study the dynamic tensile behavior of concrete, and deemed that the inertia effect cannot explain the tensile strength enhancement. Lu et al (2011) employed a hydrostatic-stress-dependent macroscopic model without considering strain-rate effect in numerical simulations of three types of dynamic tensile tests, viz. dynamic direct tensile tests, dynamic splitting tests and spalling tests, and results show little strain-rate dependency, which indicated that the observed tensile strength enhancement with strain-rate in dynamic tensile tests was a genuine material effect.…”

mentioning

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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About the dynamic uniaxial tensile strength of concrete-like materials

Cited by 151 publications

References 44 publications

Stress-strain behavior of sand at high strain rates

Stress-strain behavior of sand at high strain rates

Determination of Dynamic Compressive and Tensile Behavior of Rocks from Numerical Tests of Split Hopkinson Pressure and Tension Bars

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

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