Stress-strain behavior of sand at high strain rates

Omidvar, Mehdi; Iskander, Magued; Bless, Stephan

doi:10.1016/j.ijimpeng.2012.03.004

Cited by 218 publications

(89 citation statements)

References 91 publications

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“…The plasticity polymer model was selected to simulate the strip of the HPS. The parameters were obtained from literatures [17][18][19][20] and mechanical experiment, as listed in Table 1. The soil-and-foam model works in some ways like a fluid, which should be used only in situations where soils or foams are confined within a structure or where geometric boundaries are present.…”

Section: Modelingmentioning

confidence: 99%

Projectile Penetration into Sandy Soil Confined by a Honeycomb-Like Structure

Luo

Shi

Chen

et al. 2017

Shock and Vibration

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HPS (Honeycomb-like Protective Structure) is a newly proposed protective structure filled with sandy soil. In order to investigate the penetration resistance of the structure, numerical simulations based on SPH method had been carried out by using LS-DYNA, which are corresponding to the experiments. The calibrated model leads to reasonable predictions of the dynamic responses and damage modes of the HPS. More situations were carried out taking factors influencing the penetration into consideration, including point of impact, angle of impact, and projectile caliber. Penetration mode was established by analyzing the energy dissipation and investigating the mechanism from the phenomenological viewpoint. Simulation results show that the resisting forces and the torque that act on the long rod projectile would be greater than those acting on the short one when instability occurred. Besides, approximate 45 ∘ angle of impact was formed in the case of off-axis, which has a certain influence on the ballistic stability, resulting in more kinetic energy of projectile dissipating in HPS and less depth of penetration. The kinetic energy of projectile dissipated in sandy soil largely and the strip slightly, and the former was greater than the sum of the latter.

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Section: Modelingmentioning

confidence: 99%

Projectile Penetration into Sandy Soil Confined by a Honeycomb-Like Structure

Luo

Shi

Chen

et al. 2017

Shock and Vibration

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“…In general, the pressure p(t) and the specific impulse I are used to characterise the explosive loading. Both parameters mainly depend on the following factors (Laine, 2012;Streitkräfteamt Abt V Infrastruktur, 2007) ■ type and form of the explosive ■ soil properties -for example type of soil, density, void ratio, saturation and grain-size distribution (Omidvar et al, 2012) ■ charge depth d TNT ■ (horizontal) distance r hor between the centre of explosion and the observer ■ charge weight W TNT .…”

Section: Basic Informationmentioning

confidence: 99%

Underground explosions: estimating the safe distance

ZimbelmannJörg¹,

BoleyConrad²

2016

Geotechnical Research

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Underground explosions may contain an even more devastating potential than comparable free explosions in air, because they can produce significantly greater pressures and stronger momenta and the explosive waves may decay more slowly with increasing distance. For civil applications such as clearance of explosive ordnance, explosive tunnelling and surface mining in the vicinity of buildings, a tool is desirable, with which the safe distance r hor,safe , beyond which a building remains undamaged, may be evaluated in a fast and simple manner. The procedure to derive such a tool is exemplarily demonstrated for near-surface, underground explosions with a charge mass of 125 kg of trinitrotoluene, dry sand as foundation soil and a building with shallow foundation and no basement.Numerical simulations were carried out with the commercial hydrocode Autodyn. To track the explosion-induced wave up to sufficiently large distances, the modelling strategy called the 'moving window' was developed.With respect to the damage patterns, 'air blast', 'foundation-induced excitation of the structure to vibrations' and 'inadmissible inclination of foundations due to subsidence', the numerical time courses of the relevant wave parameters were evaluated. The result is one chart for the safe distance as a function of the explosive's charge depth.

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“…The mechanical behavior of granular media exposed to quasi-static and HSR loading was recently reviewed [24]. Shear strength of sand under drained quasi-static loading is a result of inter-particle forces.…”

Section: Modeling the Effect Of Strain Rate On The Behavior Of Sandmentioning

confidence: 99%

A Model to Predict Strain Rate Dependency of Dry Silica Sand in Triaxial Compression

Suescun-Florez

Iskander

Bless

2015

J. dynamic behavior mater.

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A new method is proposed and evaluated to model the effect of strain rate on sand during triaxial compression. Triaxial compression tests were conducted on dry silica sand with rates of 0.1-10 %/s at 100-400 kPa confining pressures. Rate effects become significant at the higher confining pressures. It is found that a modified strain-energy-density approach provides a useful means to interpolate and extrapolate constant strain rate triaxial data to other strain rates.

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Stress-strain behavior of sand at high strain rates

Cited by 218 publications

References 91 publications

Projectile Penetration into Sandy Soil Confined by a Honeycomb-Like Structure

Projectile Penetration into Sandy Soil Confined by a Honeycomb-Like Structure

Underground explosions: estimating the safe distance

A Model to Predict Strain Rate Dependency of Dry Silica Sand in Triaxial Compression

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