The explosion process is a sharp increase in volume and a sudden release of energy, usually accompanied by an increase in temperature and the release of gas. The phenomenon of underwater explosions is different from explosions that occur on the surface of the earth due to the characteristics of water. In the process of EXPLOSIVE FORMING, the choice of water as an interface due to much higher mechanical impedance of water than air and consequently higher inertia of water, is a more appropriate option. In underwater EXPLOSIVE FORMING, the wave caused by the explosion is propagated by the water environment in a fraction of a second to the target sample, and after colliding and transferring energy, it causes a very high strain rate in it, which increases and Improves sample deformation. In this study, important parameters in the underwater explosion process such as explosion depth, water depth and water vessel geometry and their impact on underwater EXPLOSIVE FORMING have been investigated. Also, the purpose of this study is to comprehensively investigate the effective parameters, analytical relationships, background researches and simulations performed in the field of underwater EXPLOSIVE FORMING.

Alluminum Alloys have important applications in recent years. In this paper we discuss EXPLOSIVE FORMING of aluminum alloy plates and effects of different parameters such as thickness, radius of mold, so as to monitor the effects of these parameters on velocity, deformation and stress. what we gain matches with existing valid results to an acceptable level.

In this work, the amount of energy delivered to a flat circular metal plate by an underwater explosion of a concentrated charge, placed at some standoff distance from the plate surface, was determined. Then, the strain energy of a conical shell was calculated. Analytical modeling was performed regarding assumptions such as, consistency of plate thickness during deformation, non-work hardening of materials, and linear variation of effective strain. Finally, the required mass of EXPLOSIVEs for FORMING of the cone was obtained by equating the delivered energy and the strain energy. Some experiments were designed and carried out for comparison with our theoretical results. Our analytical results were also compared with another set of available experimental result. These companions show relatively close agreements.

The aim of this research was to measure and study the deformation of circular steel plates (St37) in EXPLOSIVE FORMING operation for increasing the strength of circular shutters in manufacturing processes. Thus, some tests on circular steel plates (St37) were performed and the maximum deformation and it's profiles produced by exploding of different masses of C-4 in various distances, were measured. The experimental results have been compared with the results calculated by our theoretical methods. The Rajendran formula was found the best option among the existing theoretical methods for calculating maximum displacement of the material in deformation process. Finally, it was found that the percentage of error between experimental and theoretical results was negligible.

EXPLOSIVE FORMING is one of the novel sheet metal FORMING processes in which released energy of explosion is reason of FORMING. EXPLOSIVE FORMING using gas mixture is one of the EXPLOSIVE FORMING processes. In this process, after getting desired pressure in the mixture of two gases, required energy for FORMING is obtained by combustion in the chamber. In this research, a new method for FORMING of aluminum tubes by exploding gas mixture (33% oxygen-68% hydrogen) has been investigated. In order to make plastic deformation in AA6063 aluminum tubes under energy of explosion shock, an experimental setup has been designed and fabricated. Using this setup, aluminum tubes have been formed under different loading conditions and the effect of initial gas pressure and location of ignition on FORMING and suitable production of part in accordance with die configuration have been investigated. Experimental results show that the initial gas pressure of 12bar with mixing ratio of 32%oxygn-68%hydrogen can cause complete FORMING of tube in accordance with the die configuration. More initial gas pressure leads to bursting of tube before contact die wall. Also middle of tube is best location of ignition to obtain complete FORMING of tube.

Process of EXPLOSIVE form-cladding for two inhomogeneous plates, which welding them in solid state, involves simultaneous plastic deformation, is investigated analytically and experimentally. Given analytic model, is based on energy method, and considering support conditions, deformation, and impact's critical amount.Two-metal plates are converted to their equivalent homogeneous plate, with a method similar to the analysis of combined beams. Then, replacing equivalent static force, maximum deformation of plate, and possibility of rupture is predicted with respect to plates' mechanical properties. Significant factors, like velocity -which is necessary to compute impact-, is determined and weld ability of inhomogeneous plates is studied with taking into consideration welding window. Then amount of experimental deformation is compared with analytical values and rather good similarities are observed.

EXPLOSIVE Formed Projectiles (EFP) is applied extensively in anti-armour missiles. However, due to its complexity in analysis, numerical simulation is widely used. In particular, analysis of EFP FORMING and penetration can be effectively utilized in anti-armour warhead design. In this paper, the FORMING and penetration of two types of liner, including spherical with variable thickness and polynomial curve, have been simulated by LS-DYNA Code. For comparison and evaluation, several ballistic tests have also been carried out as experimental work. The results of numerical simulation, such as penetration depth and crater diameter, have been compared with the experimental results and good agreement has been obtained.

This work presents an experimental approach to the development of EXPLOSIVE FORMING of aluminum flanged domes on a male die. Firstly, weight of EXPLOSIVE charge and standoff distance from blank were determined experimentally and fixed for all the subsequent tests. Then it was proved that FORMING conditions of dome and flange were improved substantially by increasing diameter of the blank and supporting the edge of the blank over a profiled supporting ring. The distributions of the strains were studied in the course of the development. Flanged domes made from thinner blanks were more prone to compressive instability in the form of wrinkles and folds of flange. Successful FORMING of domes from thinner sheet was performed by introducing evenly distributed notches around the blank edge.