The Numerical Simulation and Blast loading of Safe Chamber for Blast Test under Internal Blast

Document Type : Original Article

Authors

imam hossein university

Abstract

Nowadays, due to the terrorist and hostile threats against the country and the urgent need to consider the principles of passive defense, it is essential to study some phenomena and subjects such as blast testing, blast effects on various targets, shock wave propagation in objects, evaluation of safety and  manufacturing of high quality safe equipment and other applications. One of these issues is the explosion test, the results of which,  can be obtained by having a safe chamber. To have such a place, it is necessary to design an explosive loading resistant chamber. For the design of the explosion test chamber, it is necessary to obtain the maximum shock pressure due to the internal blast on faces of the chamber structure. In this research, an internal blast in a chamber without opening with dimensions of 3 × 3 × 5 m is simulated with the help of AUTODYN software. But in that simulation, the obtained pressure is the pressure as exerted on a point, and the average pressure exerted on a given side of the chamber as a whole is not obtained. To solve this problem, the diagrams of pressure - time of gauges on a specified face of the chamber is made equivalent to a uniform pressure graph, with the help of the shape function of the configuration of gauges. Then, this graph is linearized with the proposed method, and is compared with the obtained graphs based on the UFC 3-340-02 regulation. The results of this study show that the maximum shock pressure obtained on the basis of simulation is larger than the results of the UFC 3-340-02 regulation in the internal blast. Also, the obtained equivalent uniform pressure graph based on the shape function is correct and can be used to design the chamber.

Keywords


  1.  S. G. Lee, H. S. Lee, J. S. Lee, Y. Y. Kim, and G. G. Choi, “Shock Response Analysis of Blast Hardened Bulkhead in Naval Ship under Internal Blast,” 10th European LS-DYNA Conference, Würzburg, Germany, 2015.##
  2. R. W. Weibull, “Pressures recorded in partially closed chambers at explosion of TNT charges,” Royal Swedish Fortifications Administration Stockholm, Sweden, 1968.##
  3. E. F. Gorbunov, A. G. Ivanov, V. A. Mogilev, A. A. Pekhterev, A. T. Plyukhin, A. A. Sirotov, V. N. Sofronov, Yu. I. Faikov, and Yu. A. Fateev, “Reaction of reinforced-concrete chambers to internal blast loading,” Russian, 1982.##
  4. J. Weerheijm and H. S. Lim, “Break-up of concrete structures under internal explosion,” In TNO Defence Security and Safety, Netherlands, 2007.##
  5. J. Weerheiim, A. Stolz, W. Riedel, and J. Mediavilla, “Modelling  loading  and  break-up of  RC structure due to internal explosion of fragmenting shells,” In TNO Defence Security and Safety, 2012.##
  6. C. F. Zhao, J. Y. Chen, Y. Wang, and S. J. Lu, “Damage mechanism and response of reinforced concrete containment structure under internal blast loading,” Theoretical and Applied Fracture Mechanics, no. 12, pp. 12-20, 2012.##
  7. A. Lotfi, “Investigating the Effect of Opening on Loaded Explosion,” Imam Hossein Comprehensive Universitym, Faslname Elmi Paghooheshi Oloom va Fannavarihaye Padafand Novin, pp. 90-100, 1397. (in Persian)##           
  8. I. Edri, Z. Savir, and V. R. Feldgun, “On Blast Pressure Analysis Due to a Partially Confined Explosion: I.Experimental Studies,” International Journal of Protective Structures, 2011.##
  9. A. L. Brundage, K. E. Metzinger, D. J. Vangoethem, and S. W. Attaway,” Model Validation of a Structure Subjected to Internal Blast Loading,” Sandia National Laboratories, 2006.##
  10. A. Niri, “Tahlil va Tarrahi Sakhtemanha dar Barabare Asarate Enfejar,” University Malek Ashtar, no.1, pp. 183-191, 1393. (in Persian) ##
  11. J. Weerheijm and H. S. Lim, “Break-up of concrete structures under internal explosion,” In TNO Defence Security and Safety, Netherlands, 2007.##
  12. Department of Defense, “Unified Facilities Criteria (UFC 3-340-02),” United States of America, 5 desember 2008. ##   
  13. P. D. Smith and J. G. Hetherington, “Blast and ballistic loading of structures,” Butterworth-Heinemann Ltd, no. 1, pp. 73-74, 1994.##   
  14. E. Rigby Samuel, “Blast wave clearing effects on    finite-sized targets subjected to explosive loads,” The Department of Civil and Structural Engineering at the University of Sheffield, pp. 132-134, 2014.##