COMPILED FREE-AIR BLAST DATA ON BARE SPHERICAL PENTOLITE

1960 ◽  
Author(s):  
H. J. GOODMAN
Keyword(s):  
Air Blast ◽  
Free Air

Characteristics of Free Air Blast Loading Due to Simultaneously Detonated Multiple Charges

2014 ◽  
Vol 14 (04) ◽  
pp. 1450002 ◽  
Author(s):  
Nimasha Weerasingha Mohottige ◽  
Chengqing Wu ◽  
Hong Hao
Keyword(s):  
Numerical Simulation ◽  
Pressure Ratio ◽  
Mesh Size ◽  
Blast Load ◽  
Charge Weight ◽  
Single Charge ◽  
Air Blast ◽  
Scaled Distance ◽  
Free Air ◽  
Blast Resistant Design

Extensive research has been conducted to investigate the characteristics of blast load due to single charge explosion, including numerical simulations and experimental blast tests in both unconfined and confined environments. Further, available guidelines for blast resistant design such as UFC-3-340-02 (2008) and ASCE 59-11 (2011) provide details to predict blast loads on a structure subjected to single charge explosion. However, blast load characteristics due to multiple charge explosions are poorly discussed in available literature. In this paper, commercially available Hydrocode, AUTODYN is calibrated for single charge explosions. Based on a comparison between numerical simulation and UFC prediction, correction factors for peak reflected pressure and positive reflected impulse as a function of charge weight, scaled distance and mesh size of the numerical model are proposed to minimize the errors in simulations. The calibrated AUTODYN model is then used to conduct parametric studies to investigate the effects of charge weight, scaled distance, number of charges and distance between the charges on the characteristics of free air blast load due to simultaneous detonated multiple charges. Numerical simulation results are used to derive analytical formulas for predictions of peak reflected pressure ratio and positive reflected impulse ratio between single and multiple explosions. The discussion is made on characteristics of free air blast load due to simultaneous detonated multiple charges.

Full-Field Deformation Measurements of Aluminum Plates Under Free Air Blast Loading

2012 ◽  
Vol 52 (9) ◽  
pp. 1371-1384 ◽  
Author(s):  
K. Spranghers ◽  
I. Vasilakos ◽  
D. Lecompte ◽  
H. Sol ◽  
J. Vantomme
Keyword(s):  
Blast Loading ◽  
Air Blast ◽  
Full Field ◽  
Free Air ◽  
Aluminum Plates ◽  
Air Blast Loading ◽  
Deformation Measurements

Numerical Review of Jones–Wilkins–Lee Parameters for Trinitrotoluene Explosive in Free-Air Blast

2020 ◽  
Vol 87 (5) ◽  
Author(s):  
Anthoni Giam ◽  
William Toh ◽  
Vincent Beng Chye Tan
Keyword(s):  
Blast Wave ◽  
Material Behavior ◽  
Time Of Arrival ◽  
Explosive Material ◽  
Air Blast ◽  
The Past ◽  
Wave Characteristics ◽  
Free Air ◽  
Highly Sensitive ◽  
Numerical Finite Element

Abstract The analysis of complex blast scenarios typically requires advanced computational methods such as multi-material Eulerian and coupled Eulerian–Lagrangian (CEL) analysis where Jones–Wilkins–Lee (JWL) equation of state is used to model the explosive material. While multiple sets of empirical JWL parameters for trinitrotoluene (TNT) explosives have been published over the past few decades, there is also a lack of guidelines and comparative studies on their applications for the blast analysis. A standardized description of the explosive material behavior allows for a better interpretation of results from research studies involving different blast scenarios and JWL parameters. In this paper, the authors utilize numerical finite element (FE) simulations to investigate the influence of different TNT JWL parameter sets on the blast wave characteristics of a free-air blast across different scaled distances. Utilizing multi-material Eulerian analysis, a series of spherical free-air blasts involving a 100-kg TNT charge modeled with different TNT JWL parameters are conducted. The blast wave characteristics including the incident overpressure, impulse, and time of arrival (TOA) are benchmarked against the empirical-based Kingery–Bulmash air blast formulations through the conventional weapon effect calculator conwep. It was found that the incident overpressure and impulse are highly sensitive to the JWL parameters, with differences as high as 40% at smaller scaled distances, while the influence on TOA is much less significant. This paper hopes to provide a guide for future users on the appropriate JWL parameter sets to model the air blast events involving TNT explosives.

A Modified Equation of Parameter of Free-air Blast Load

2016 ◽  
Vol 16 (4) ◽  
pp. 117-123
Author(s):  
Doo-Jin Jeon ◽  
◽  
Min-Jae Lee ◽  
Sang-Eul Han
Keyword(s):  
Blast Load ◽  
Air Blast ◽  
Free Air ◽  
Modified Equation

scholarly journals Experimental study on counterintuitive behavior of thin aluminium plates under free airblast loading

2018 ◽  
Vol 183 ◽  
pp. 02059
Author(s):  
Zixi Xu ◽  
Yan Liu ◽  
Fenglei Huang
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Dimensionless Parameter ◽  
Permanent Deformation ◽  
Structural Response ◽  
Impulsive Loading ◽  
Special Focus ◽  
Air Blast ◽  
Free Air ◽  
Air Blast Loading

An experimental investigation of the counterintuitive behaviour in thin aluminium plates under fullfield test is presented in the paper. Special focus is placed on structural response and permanent deflection of the panels after the complex response. Thus, a series of tests with the plates varied in two kinds of thickness were conducted, where impulsive loading was generated by detonating the explosives at various standoff distances. As loaded impulsively, the vibration response was observed and the final configuration of each plate was measured and recreated. It is shown that all plates subjected to free air blast loading in such conditions exhibited plastic permanent deformation combined with distinct counterintuitive behaviour, as the plates deformed to the opposite direction of the incident wave. In addition, the characteristics of the permanent deflection can be divided into 2 typical deformation shapes, and the occurrences of which were correlated to the dimensionless parameter proposed in previous studies, confirmed to be an approximate indicator to describe the influence of loading conditions herein.

Sign in / Sign up

Export Citation Format

Share Document