The experimental and numerical impacts of geometrical parameters of conical shock tube on the function, maximum pressure and generative impulses to expose equivalent mass and behavioral equation: Experimentelle und numerische Einflüsse geometrischer Parameter eines konischen Stoßrohres auf Funktion, Maximaldruck und generative Impulse zur Ausführung äquivalenter Masse‐ und Verhaltens‐Gleichungen. Issue 7 (8th July 2016)

• Record Type: Journal Article
• Authors: Heshmati, M.; Zamani, J.; Mozafari, A.
• Is Part Of: Materialwissenschaft und Werkstofftechnik. Volume 47:Issue 7(2016:Jul.)
• Page Start: 623
• Page End: 634
• Publication Date: 2016-07-08
• Subjects: Explosionsrohr -- unter Wasser Explosion -- Explosion -- Numerische Simulation -- Schockwelle -- Verstärkungsfaktor; Shock tube -- under water explosion -- explosion -- numerical simulation -- shock wave -- amplification factor; Materials -- Periodicals; Materials -- Testing -- Periodicals; 620.1
• DOI: 10.1002/mawe.201600510
• Languages: English
• ISSNs: 0933-5137

Abstract

Abstract : One of the methods to investigate the phenomenon of explosion underwater and its impact on the structures is to use the conical shock tube. These tubes produce a lot of pressure using a tiny explosive charge. In this essay, the geometry of the established/manufactured explosive shock tube is demonstrated first and the results of the experiments operating the tube is presented. Then, the explosion of a given amount of explosive charge in the conical shock tube is studied by benefiting the LS‐DYNA code. The numerical simulation is done by Lagrange‐Oiler selected multi‐materials solutions. To ensure the authenticity of the selected method in the software, the results of the stimulated model is compared with the experimental outcomes accordingly, after accrediting the accuracy of the results, the stimulating and scrutinizing the effects of geometrical parameters on the function of explosive shock tubes is proceeded. In this research, the effect of the cone head angel on the produced pressure inside the shock tube is analyzed first. Then, the function of shock tubes with different lengths is checked. Moreover, after changing the scale of the explosive charge and studying the outcome, stating the reasons for changes in each parameter and examining the effect of the relation between the explosive proportion and the water volume inside the shock tube, an equation for the equivalent mass for all sock tubes with different angels is exhibited and the existing theoretical relation is revised. Finally, by examining the pressure and impulses changes in different intervals, an equation is presented to anticipate the pressure and impulses in different shock tubes.