A dynamic damage growth model for uniaxial compressive response of rock aggregates

Huang, C. Julia; Subhash, Ghatu; Vitton, Stanley J.

doi:10.1016/s0167-6636(02)00112-6

Cited by 73 publications

(40 citation statements)

References 27 publications

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“…The transition strain rate depends on the speed of fracture propagation and on the interaction between cracks, controlled by the statistics of the initial crack population and the size of the stress shadow zones around each crack. These parameters do not strongly depend on the fracture mode 19 . The fracture speed propagation is close to the S wave velocity cs in all fracture modes.…”

mentioning

confidence: 83%

Rock pulverization at high strain rate near the San Andreas fault

2009

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mentioning

confidence: 83%

Rock pulverization at high strain rate near the San Andreas fault

2009

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“…Drucker-Prager model) and confined dynamic tests and analyses [e.g. Chen and Ravichandran(1997), Nemat-Nasser and Horii(1982), Huang et al(2002), Huang et al(2003)]. It was pointed out in Li and Meng(2003) that the misinterpretation of the confinement enhancement as the strain-rate enhancement in a SHPB test leads to non-conservative design or analysis of a concrete structure against impact or blast loading.…”

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

242

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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“…For the sandstone, a large number of shear-dominated cracks rapidly grew and caused a significant dilatation of the specimen. It is well known that brittle materials exhibit axial cracking during uniaxial compression loading [15]. This was clearly observed for the sandstone during static loading (Fig.…”

Section: Deformation Mechanisms Under Dynamic Loadingmentioning

confidence: 57%

The Impact Response of Coquina: Unlocking the Mystery Behind the Endurance of the Oldest Fort in the United States

Subhash¹,

Jannotti

Subhash

2015

J. dynamic behavior mater.

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The Castillo de San Marcos fort in St. Augustine, FL, has withstood numerous wars and hurricanes for over 300 years. Interestingly, during military sieges it was discovered that the fort walls did not shatter upon impact, but instead absorbed the cannonballs. The endurance of this fort is attributed to a native rock, called coquina, from which it was constructed. Quasi-static and high strain rate uniaxial compression experiments were conducted on coquina and two other materials (sandstone and a structural foam) with similar structures and physical properties. Additionally, low-velocity ball impact experiments, analogous to impacts due to cannonballs, coupled with highspeed imaging were performed to investigate the impact response. The analysis explored the operative deformation mechanisms which gave rise to the fort's endurance against impacting cannonballs. It was revealed that the microstructure of coquina does not lend itself to macroscopic brittle fracture, but absorbs impact energy by progressive crushing similar to a cellular structure, and thus allows for a high specific energy absorption.

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A dynamic damage growth model for uniaxial compressive response of rock aggregates

Cited by 73 publications

References 27 publications

Rock pulverization at high strain rate near the San Andreas fault

Rock pulverization at high strain rate near the San Andreas fault

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

The Impact Response of Coquina: Unlocking the Mystery Behind the Endurance of the Oldest Fort in the United States

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