ALE Multi-Material Formulation of High Explosive Detonation Using LS-DYNA3D

Mahmadi, K.; Aquelet, Nicolas; Souli, M’hamed; Gabrys, Jonathan

doi:10.1115/pvp2002-1468

Cited by 4 publications

(3 citation statements)

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“…Key word*MAT_HIGH_EXPLOSIVE_BURN of high explosive in LS DYNA (Mahmadi et al, 2002). Pressure and gas produced by explosion can be expressed by equation JWL (Halquist et al, 2010).…”

Section: Materials Constitutive Model and Parametersmentioning

confidence: 99%

Dynamic response characteristics of adjacent tunnel lining under blasting impact in subway connecting passage

Xiong

Jiang

Zhou

et al. 2022

International Journal of Protective Structures

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The connecting passage between two adjacent tunnels is conducive to the rescue and evacuation of subway tunnels when disasters occur. The blasting method is usually used in the construction of connecting passage. The vibration caused by blasting construction may endanger the safety of subway tunnel structure. As a result, the influence of blasting pressure on the stability of subway tunnel lining structure during the excavation of connecting passage is studied, and the safe blasting construction distance is proposed, which is crucial to the safety of adjacent subway tunnel lining. This study takes the connecting passage of Wuhan Metro Line 8 as an example. Using Finite element software ANSYS/LS-DYNA, an accurate numerical calculation model of construction site is established. The nonlinear elastoplastic mechanical characteristics of soil, rock, and tunnel lining are simulated by Drucker Prager, Plastic Kinematic, and Johnson Holmquist Concrete constitutive material models, respectively. The credibility of the three-dimensional numerical calculation model and material constitutive model was proved by contrasting the field measured data of the connecting passage with the numerical calculated results. Analysis of numerical results, the axial and radial PPV, frequency, and Von Mises stress of subway tunnel lining are obtained. The influence of subway tunnel lining under adjacent blasting can be obtained by analyzing the distribution law of PPV and Von Mises stress. Non-static tensile strength is needed considering the high pressure and high strain rate process of concrete during blasting. By fitting the relationship between PPV and dynamic tensile stress, and referring to DIF parameters, the safety range of PPV in subway tunnel lining blasting is determined. The critical safety distance between blasting construction and tunnel lining is obtained by Sadovsky vibration velocity attenuation formula, which is used to guide the subsequent blasting excavation of continuous tunnels.

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“…Key word*MAT_HIGH_EXPLOSIVE_BURN of high explosive in LS DYNA (Mahmadi et al, 2002). Pressure and gas produced by explosion can be expressed by equation JWL (Halquist et al, 2010).…”

Section: Materials Constitutive Model and Parametersmentioning

confidence: 99%

Dynamic response characteristics of adjacent tunnel lining under blasting impact in subway connecting passage

Xiong

Jiang

Zhou

et al. 2022

International Journal of Protective Structures

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show abstract

“…In this paper, the high-energy explosive material model *MAT_HIGH_EXPLOSIVE_BURN [19] and the state equation of Jones-Wilkins-Lee [20] are used to simulate the TNT explosive. The high-energy explosive material model used to specify the density, detonation velocity and detonation pressure of explosive.…”

Section: The Materials Model For Explosivementioning

confidence: 99%

Propagation of shock wave and structure dynamic response of explosion in a subway station: a case study of Wuhan subway station

Jiang¹,

Hu²,

Zhang³

et al. 2020

J. vibroeng.

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With the development of urbanization, the construction of the subway has been greatly developed. Meanwhile, the public concern of terrorist attacks on subway stations keeps driving the related research. In this paper, the representative subway station of Wuhan Metro Line 8, Mafangshan station, which is now under construction, is taken as a case, the dynamic finite element numerical simulation software ANSYS/LS-DYNA is employed to establish finite element model. The propagation law transmitting through the station structure and the dynamic response of the station under different TNT charges are analyzed. It is indicated that the propagation of shock wave is complicated due to the semi-closed environment of the station as well as the reflection and transmission of the stress wave in the structure. Specifically, in the station structure, the displacement of the platform plate was the largest, under the explosive action of different TNT charge, the displacement of platform plate is 13.6 mm (5 kg), 22. 8mm (10 kg), 35.2 mm (20 kg), 45.6 cm (30 kg), 68.8 cm (40 kg), respectively. The middle part of the pillar was the largest displacement on the pillar. Based on the dynamic stress response analysis of the station pillar, it shows that the maximum value of the stress value in the pillar is located at the junction of the pillar and the plate. Under the explosive action of 40 kg TNT charge, the maximum tensile stress of the junction of the pillar and the plate reached 45.1 MPa. Therefore, more attention should be paid to anti-explosion measures herein. Besides, through the analysis of the tensile stress value at the bottom of the pillar under different charge quantity, the TNT charge quantity for the crack at the bottom of the pillar is determined to be 6.77 kg by the formula fitting.

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“…paying attention to arbitrary fluid particles, and the Euler method for dealing with change of physical quantity, such as velocity and pressure, as function for the position of the point and time in space. We used the Multi-Material ALE Formulation [14] for water and air. Two levels of ALE technology exist.…”

Section: Ale Formulationmentioning

confidence: 99%

Investigating the Effect of Sloshing on the Energy Absorption of Tank Wagons Crash

Razaghi

Sharavi

Feizi

2015

Transactions of the Canadian Society for Mechanical Engineering

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One of the main fluid mechanics phenomena is fluid sloshing which is originated from the free surface of fluid and should be taken into account in design of fluid structures such as fuel tank wagons, ships and so on. The aim of this paper is to investigate the effect of tank fluid sloshing on energy absorption and reducing tank acceleration during the tank wagon impact. For this purpose, methods of software simulation and dynamics solution methods are accomplished. The assumed wagon includes a tank with the approximate volume of 95 m3 and capacity of 65 tons of fluid. Using finite element method, the tank impact is simulated based on the corresponding standards for different heights of fluid in the tank. Obtained results show fluid height increase has an inappropriate effect on energy absorption among impact however the more fluid in tank, the more time would be consumed for energy absorption in general. At the end, by using crash test results for a tank with aforementioned scale, validity of impact software simulation and dynamic solution method considering the tank fluid as mass-spring model are checked.

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ALE Multi-Material Formulation of High Explosive Detonation Using LS-DYNA3D

Cited by 4 publications

References 0 publications

Dynamic response characteristics of adjacent tunnel lining under blasting impact in subway connecting passage

Dynamic response characteristics of adjacent tunnel lining under blasting impact in subway connecting passage

Propagation of shock wave and structure dynamic response of explosion in a subway station: a case study of Wuhan subway station

Investigating the Effect of Sloshing on the Energy Absorption of Tank Wagons Crash

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