Strain-Rate-Dependent Constitutive Equations for Concrete

Tedesco, Joseph W.; Ross, C. A.

doi:10.1115/1.2842350

Cited by 198 publications

(79 citation statements)

References 10 publications

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“…Grote et al (2001)]. However, researches have suggested that inertia effect cannot in general be cancelled by adjusting specimen geometry [Gorham et al (1984[Gorham et al ( , 1992, Gorham(1991Gorham( , 1992 [Ross et al (1989[Ross et al ( , 1995[Ross et al ( , 1996, Tedesco and Ross(1998)] and 266 s -1 in Grote et al(2001).…”

Section: Introductionmentioning

confidence: 99%

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

Zhang¹,

Wu²,

Li³

et al. 2009

International Journal of Impact Engineering

237

126

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Effects of the inertia-induced radial confinement on the dynamic increase factor (DIF) of a mortar specimen are investigated in split Hopkinson pressure bar (SHPB) tests. It is shown that axial strain acceleration is unavoidable in SHPB tests on brittle samples at high strain-rates although it can be reduced by the application of a wave shaper. By introducing proper measures of the strain-rate and axial strain acceleration, their correlations are established. In order to demonstrate the influence of inertia-induced confinement on the dynamic compressive strength of concrete-like materials, tubular mortar specimens are used to reduce the inertia-induced radial confinement in SHPB tests. It is shown that the DIF measured by SHPB tests on tubular specimens is lower than the DIF measured by SHPB tests on solid specimens. This paper offers experimental support for a previous publication , Int. J. of Solids and Struct., 40,[343][344][345][346][347][348][349][350][351][352][353][354][355][356][357][358][359][360], which claimed that inertia-induced radial confinement makes a large contribution to the dynamic compressive strength enhancement of concrete-like materials when the strain-rate is greater than a critical transition strain-rate between 10 1 and 10 2 s -1 . It is concluded that DIF formulae for concrete-like materials measured by split Hopkinson pressure bar tests need to be corrected if they are going to be used as the unconfined uniaxial compressive strength in the design and numerical modelling of structures made from concrete-like materials to resist impact and blast loads.

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Section: Introductionmentioning

confidence: 99%

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

Zhang¹,

Wu²,

Li³

et al. 2009

International Journal of Impact Engineering

237

126

View full text Add to dashboard Cite

show abstract

“…Then, it was gradually imported into the studies of brittle materials like rock, ceramic, and concrete (Kumar 1968;Ravichandran and Subhash 1994;Li and Gu 1994;Al-Mousawi et al 1997;Tedesco and Ross 1998;Zhao et al 1999;Cai et al 2007;Demirdag et al 2010;Zhang and Zhao 2013a). However, because of the brittle and heterogeneous characteristics of rock-like materials, the technique was plagued with the following problems:…”

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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“…The increase of strength of concrete subjected to loadings of higher strain rates is a well-known phenomenon and is described in the design standards [1,2] and literature, e.g. [3,4]. The dynamic increase factor (DIF) corresponds to the strain rate the concrete is subjected to and is used for quantification of the increase of tensile and/or compressive strength when describing the behaviour of concrete under extreme loadings such as blasts and impact.…”

Section: Introductionmentioning

confidence: 99%

Impact performance of FRC slabs under various strain rates

Horská

Jiříček

Foglar

2015

EPJ Web of Conferences

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Abstract. Impact resistance of plain concrete and FRC composites gains high importance in the present days. This paper presents outcomes of the experiments focused on performance of FRC slabs subjected to impact loading of various strain rates. The FRC slabs, thickness 30, 60 and 120 mm were subjected to various drop-weight impacts. The different drop-hammer weights provided different loading speeds and strain rates. The performance of the slabs was recorded with the use of high speed cameras. The cameras were used for impact speed control and specimen deflection measurement. With the use of the recordings, the force-time response of the slabs could be plotted. The plots correspond to the mechanical behaviour obtained by static load tests (loading speed 0.2 mm/min) but several differences can be found. Several types of FRC (varying fiber material, fiber content, etc.) were tested and evaluated. The experimental program is supplemented by numerical modelling which provides good agreement with the experimental results.

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Strain-Rate-Dependent Constitutive Equations for Concrete

Cited by 198 publications

References 10 publications

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

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

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

Impact performance of FRC slabs under various strain rates

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