scholarly journals Internal explosion load distribution and strain response of ellipsoidal end cover of explosion containment vessel

2020 ◽  
Vol 1507 ◽  
pp. 032030
Author(s):  
Y H Hu ◽  
W B Gu ◽  
J Q Liu ◽  
Y M Han ◽  
Z Wang
Keyword(s):  
Load Distribution ◽  
Strain Response ◽  
Containment Vessel ◽  
Internal Explosion ◽  
Explosion Load

scholarly journals Study on Reduction Effect of Vibration Propagation due to Internal Explosion Using Composite Materials

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Sangwoo Park ◽  
Jangwoon Beak ◽  
Kukjoo Kim ◽  
Young-Jun Park
Keyword(s):  
Field Experiment ◽  
Urban Areas ◽  
Concrete Strength ◽  
Vibration Reduction ◽  
Ground Vibration ◽  
Experimental Conditions ◽  
Acceleration Sensors ◽  
Internal Explosion ◽  
Reduction Effect ◽  
Explosion Load

AbstractWith the increasing installation cases of underground explosive facilities (e.g., ammunition magazines, hydrogen tanks, etc.) in urban areas in recent years, the risk of internal explosions is also increasing. However, few studies on the measures for reducing damage by the ground vibration have been conducted except for maintaining safety distance. In this study, a method for attenuating the vibration propagated outward by installing a blast-proof panel was numerically and experimentally investigated. Two cubical reinforced concrete structures were manufactured according to the concrete strength and a blast-proof panel was installed on only one side of the structure. Then, acceleration sensors were installed on the external surface to evaluate the propagation of vibration outward depending on the installation of a blast-proof panel. Before a field experiment, a preliminary numerical simulation was performed. The results showed that the acceleration propagated outward could be effectively reduced by installing a blast-proof panel. Even though the performance of a blast-proof panel on vibration reduction was also investigated in the field experiment, significantly larger absolute accelerations were estimated due to the different experimental conditions. Finally, the vibration reduction effect of the blast-proof panel was numerically evaluated according to its thickness and the internal explosion load. A blast-proof panel more effectively reduced the acceleration propagated outward as its thickness increased and the explosion load decreased.

scholarly journals Anti-explosion Capability and Impact Response of an Innovative Multi-layered Composite Explosion Containment Vessel

2021 ◽  
Author(s):  
Qi Yuan ◽  
Heng Chen ◽  
Wenbin Gu ◽  
Zhen Wang ◽  
Likai Hao
Keyword(s):  
Shock Wave ◽  
Sandwich Structure ◽  
Steel Plate ◽  
Structural Parameters ◽  
Human Life ◽  
Single Layer ◽  
Experimental Tests ◽  
Element Model ◽  
Containment Vessel ◽  
Internal Explosion

Abstract Owing to its advantages of high strength and low density, composite explosion containment vessel (CECV) can limit the scope of internal explosion shock wave, thereby reducing the damage to the surrounding environment and protecting human life and property. However, due to the complexity of the explosion process and related structure, the mechanism by which shock wave is induced on the inner lining of the explosion containment vessel (ECV) and the influence of the structural parameters of ECV on the reflection overpressure of the inner wall are not understood clearly. In this study, the characteristic of the internal explosion pressure load of a single-layer ECV is examined through experimental tests and simulations, and a three-dimensional mesoscopic model is established and verified. Furthermore, to solve the problem of the restricted explosion resistance of the single-layer ECV, a new steel plate-aluminum honeycomb-fiber cloth sandwich structure with sliding lining is proposed to design a multi-layer CECV. For the arrangement of fiber filaments, uniform distribution, random distribution, and honeycomb distribution algorithms are established based on Python language. Finally, a finite element model of the CECV is established, and a series of explosion simulations are conducted. The results indicate that the laying angle of the fibre cloth has no effect on the peak overpressure inside the ECV, and the ECV exhibits the best protective property when the laying angle of the fibre cloth is 0°/ 45°/ 90°/ 45°/ 0°. It is also observed that the steel plate-aluminium honeycomb-fibre cloth sandwich structure prolongs the action time of the explosion shock wave and greatly reduces the peak pressure in the CECV. Remarkably, for the weakest position of the tank, the strain for the multi-layer CECV under 3000 g TNT is even less than that for the single-layer ECV under 150 g TNT.

Development of Compact Blast Containment Vessel for 10 kg Explosive

2010 ◽  
Vol 638-642 ◽  
pp. 1047-1052
Author(s):  
Shiro Kubota ◽  
Tei Saburi ◽  
Katsumi Katoh ◽  
Tomotaka Homae ◽  
Yuji Ogata ◽  
...  
Keyword(s):  
Internal Structure ◽  
High Speed ◽  
High Speed Photography ◽  
Pressure Measurements ◽  
Explosion Chamber ◽  
Development Study ◽  
Model Experiments ◽  
Containment Vessel ◽  
Explosive Materials ◽  
Internal Explosion

The development study of blast containment vessels for anti-terrorism has been conducted. The goal of this study is to develop safe disposal vessel for 10 kg of explosives. Considering of the use at the airport or railroad stations, it needs to be more compact compared with the conventional explosion chamber. By introducing both the internal structure and attenuation technology in the vessel, sufficient blast proof ability to contain internal explosion is realized. The blast containment vessel can be used repeatedly by exchanging the internal structure. To realize these concepts, model experiments were carried out using high speed photography, strain and pressure measurements. By introducing these technologies, the vessel for the 1 kg of explosive materials has been made, and the experiments employing 1 kg C4 explosive have been conducted. Finally, the compact blast containment vessel for 10 kg explosives was made, and its blast proof ability was shown by the internal blast test.

Analysis of Explosion Load in a Cylindrical Container With Sand Bottom

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Saiwei Cheng ◽  
Xiaojie Li ◽  
Yuxin Wang ◽  
Dezheng Zhou ◽  
Honghao Yan ◽  
...  
Keyword(s):  
Shock Wave ◽  
Numerical Model ◽  
Impact Load ◽  
Three Dimensional ◽  
Containment Vessel ◽  
Explosion Loading ◽  
Simulation Results ◽  
Explosion Load ◽  
Sand Bottom ◽  
Good Agreement

Abstract Explosion containment vessels are widely used in many fields. Here, the detonation impact load of explosives in a cylindrical closed explosion containment vessel partially filled with sandy soil was studied. A three-dimensional numerical model of the explosion containment vessel was established by using finite element code ls-dyna. To calibrate this numerical model, we carried out an explosion loading experiment of the explosion containment vessel. Then, the experimental data and the numerical simulation results were compared, and a good agreement between them was obtained. The calibrated numerical model was used to investigate the explosive impact load generated by explosives in a cylindrical explosion containment vessel. The results reveal the attenuation law of shock wave overpressure and the distribution characteristics of the maximum peak overpressure of the shock wave on the inner wall of the cylindrical explosion containment vessel.

Experimental Characterization of Mechanical Behavior of Cord-Rubber Composites

1982 ◽  
Vol 10 (1) ◽  
pp. 37-54 ◽  
Author(s):  
M. Kumar ◽  
C. W. Bert
Keyword(s):  
Response Characteristic ◽  
Cord Compression ◽  
Complete Characterization ◽  
Strain Response ◽  
Strain Gages ◽  
Experimental Characterization ◽  
Rubber Composites ◽  
Stress Strain ◽  
Strain Data

Abstract Unidirectional cord-rubber specimens in the form of tensile coupons and sandwich beams were used. Using specimens with the cords oriented at 0°, 45°, and 90° to the loading direction and appropriate data reduction, we were able to obtain complete characterization for the in-plane stress-strain response of single-ply, unidirectional cord-rubber composites. All strains were measured by means of liquid mercury strain gages, for which the nonlinear strain response characteristic was obtained by calibration. Stress-strain data were obtained for the cases of both cord tension and cord compression. Materials investigated were aramid-rubber, polyester-rubber, and steel-rubber.

A Modular Race Tire Model Concerning Thermal and Transient Behavior using a Simple Contact Patch Description

2013 ◽  
Vol 41 (4) ◽  
pp. 232-246
Author(s):  
Timo Völkl ◽  
Robert Lukesch ◽  
Martin Mühlmeier ◽  
Michael Graf ◽  
Hermann Winner
Keyword(s):  
Load Distribution ◽  
Thermal Condition ◽  
Transient Behavior ◽  
Wheel Load ◽  
Contact Patch ◽  
Fundamental Parameters ◽  
Dry Conditions ◽  
Simple Contact ◽  
Tire Forces ◽  
Descriptive Set

ABSTRACT The potential of a race tire strongly depends on its thermal condition, the load distribution in its contact patch, and the variation of wheel load. The approach described in this paper uses a modular structure consisting of elementary blocks for thermodynamics, transient excitation, and load distribution in the contact patch. The model provides conclusive tire characteristics by adopting the fundamental parameters of a simple mathematical force description. This then allows an isolated parameterization and examination of each block in order to subsequently analyze particular influences on the full model. For the characterization of the load distribution in the contact patch depending on inflation pressure, camber, and the present force state, a mathematical description of measured pressure distribution is used. This affects the tire's grip as well as the heat input to its surface and its casing. In order to determine the thermal condition, one-dimensional partial differential equations at discrete rings over the tire width solve the balance of energy. The resulting surface and rubber temperatures are used to determine the friction coefficient and stiffness of the rubber. The tire's transient behavior is modeled by a state selective filtering, which distinguishes between the dynamics of wheel load and slip. Simulation results for the range of occurring states at dry conditions show a sufficient correlation between the tire model's output and measured tire forces while requiring only a simplified and descriptive set of parameters.

Dynamic Service Placement and Load Distribution in Edge Computing

2020 ◽  
Author(s):  
Adyson Magalhaes Maia ◽  
Yacine Ghamri-Doudane ◽  
Dario Vieira ◽  
Miguel Franklin de Castro
Keyword(s):  
Load Distribution ◽  
Edge Computing ◽  
Service Placement

Comparative assessment of rubber steel cables for vertical mine hoists

2020 ◽  
pp. 85-93
Author(s):  
V. E. Perekutnev ◽  
V. V. Zotov
Keyword(s):  
Feasibility Study ◽  
Carrying Capacity ◽  
Load Distribution ◽  
Comparative Assessment ◽  
Life Extension ◽  
Steel Cable ◽  
Motion Stability ◽  
Cable Length ◽  
Steel Cables ◽  
Mine Hoist

Operation of inhaul rubber steel cables in vertical mine hoisting is discussed. The research in the field of mine hoisting is reviewed, and the further R&D directions are identified. Some studies concern life extension of hoisting ropes. One of the promising trends seems to be application of belt pullers as inhaul cables, which can essentially enhance mine hoist efficiency. In the meanwhile, capabilities of rubber steel cables suffer from deficient attention. The performance capabilities of rubber steel cables of top manufacturers (Promkanat and SAG) are compared, and application ranges in vertical mine hoisting are determined for such cables. It is found that the Polish manufacturer’s rubber steel cables offer a wider range of application. The analysis shows that rubber steel cables can be used as inhaul cables of vertical mine hoisters. Rubber steel cables possess suitable characteristics and are capable to elevate considerable loads to various hoisting heights. In particular, the existing rubber steel cables ensure carrying capacity of hoists up to 20-25 t at the hoisting heights to 400-500 m and sometimes can elevate skips with tonnage of 10 t to a height up to 1000 m and more. The further feasibility study of operation of inhaul steel rubber cables in hoisting units should address motion stability of a puller on a driving drum, load distribution in ropes of base of rubber steel cables, validation of hoister design, adjustability of rubber steel cable length during its operation, etc.

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