Unsaturated soil blast: Flying plate experiment and numerical investigations

Linforth, Steven; Tran, Phuong; Rupasinghe, Madhuwanthi; Nguyen, Nam Hoai; Ngo, Tuan; Saleh, Michael; Odish, Rami; Shanmugam, Dinnesh

doi:10.1016/j.ijimpeng.2018.08.002

Cited by 25 publications

(7 citation statements)

References 23 publications

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“…The explosive was selected due to its popularity in blast research. The material was used in many recent studies [11][12][13]. The indicative TNT equivalencies are widely available, e.g., in [5].…”

Section: Methodsmentioning

confidence: 99%

Experimental study of blast loading behind a building corner

Gajewski

Sielicki

2020

Shock Waves

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The paper presents unique blast experiments in reference to scientific literature and official standards. Experimental scenarios reflect a hypothetical realistic combat situation of a human being covered from a blast wave behind a rigid building corner. In the scenario assumed, the overpressure loads affect the lungs while the person is standing or the eardrums while the person is kneeling at the aiming position. The paper presents 27 free-field experiments measuring the overpressure loads. All the measurements were taken behind the right angle of the rigid wall. Two masses of TNT were considered: 200 g and 400 g. In the selected cases, a low test-to-test variability of the measured data was observed. Detailed plots of overpressure versus time are presented for various distances behind the building corner and TNT charge masses. Peak overpressure versus positive impulse plots are also demonstrated. Furthermore, the safety thresholds regarding different locations behind the building corner are defined for the considered explosive masses.

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Section: Methodsmentioning

confidence: 99%

Experimental study of blast loading behind a building corner

Gajewski

Sielicki

2020

Shock Waves

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“…Cellular materials present interesting properties, such as high specific strength and large densification strains, so they are regarded as potential candidates for various engineering applications such as energy absorption for protective application [1–3], heat dissipation, structural components and biomedical implant [4–14]. Moreover, they can be optimised easily, through the choice of topology (e.g.…”

Section: Introductionmentioning

confidence: 99%

Triply periodic minimal surfaces sandwich structures subjected to shock impact

Tran

Peng

2020

Jnl of Sandwich Structures & Materials

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Triply periodic minimal surfaces are cellular structures that naturally inspired continuous non-self-intersecting surfaces similar to bone microstructure with controllable mechanical properties. In this work, sandwich composite panels constructed from four different types of TMPS unit cells and metallic facets are numerically investigated and compared to evaluate the dynamic behaviours when subjected to extreme loadings. The finite element analysis is utilised to simulate the deformation of proposed structures considering the rate-dependent properties, elastoplastic response and nonlinear contact. The Johnson–Cook material model is implemented to capture the transient responses of the four TPMS panels under high strain-rate loadings. The numerical model is validated with a two-dimensional analytical one to reveal the static and dynamic crushing behaviors. Only a quarter of the sandwich panel is simulated using shell elements thanks to the symmetry, which significantly reduces the computational cost. A series of parametric studies are conducted to demonstrate the influences of different design parameters on the blast resistances of triply periodic minimal surface composite panels. Reaction forces and critical stresses extracted from underneath protected structure are assessed for various key parameters, including triply periodic minimal surface type, thickness and number of layers. The four TPMS sandwich structures clearly demonstrate unique dynamic crushing responses, impact energy mitigation and dissipation mechanisms, which leads to enhancement of the blast resistance.

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“…A detailed description of the test procedure can be found in [60]. The stemming was simulated using the FHWA soil model with the reported parameters of unsaturated sand (Table 3) [61] and supplemented with values from the literature [13,39]. The FHWA soil model is efficient for modeling the behavior of soil or/and sand with the consideration of strain softening, strain rate effects, moisture content and kinematic hardening [13,39].…”

Section: Stemming and High-explosive Materials Modelsmentioning

confidence: 99%

Experimental testing and numerical simulations of blast-induced fracture of dolomite rock

et al. 2020

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In this paper, the Johnson-Holmquist II (JH-2) model with parameters for a dolomite rock was used for simulating rock fragmentation. The numerical simulations were followed by experimental tests. Blast holes were drilled in two different samples of the dolomite, and an emulsion high explosive was inserted. The first sample was used to measure acceleration histories, and the cracking pattern was analyzed to perform a detailed study of the blastinduced fracture to validate the proposed method of modelling and to analyze the capability of the JH-2 model for the dolomite. The second sample was used for further validation by scanning the fragments obtained after blasting. The geometries of the fragments were compared with numerical simulations to further validate the proposed method of modelling and the implemented material model. The outcomes are promising, and further study is planned for simulating and optimizing parallel cut-hole blasting.

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Unsaturated soil blast: Flying plate experiment and numerical investigations

Cited by 25 publications

References 23 publications

Experimental study of blast loading behind a building corner

Experimental study of blast loading behind a building corner

Triply periodic minimal surfaces sandwich structures subjected to shock impact

Experimental testing and numerical simulations of blast-induced fracture of dolomite rock

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