scholarly journals IMP-04: A Method of Designing Uniformly Distributed Underwater Shock Pressure for Controlling the Condition of Explosive Welding of a Thin Plate-Effect of Inclined Angle of Explosive to Get Uniform Pressure Distribution(IMP-I: IMPACT BEHAVIOR OF MATERIALS AND STRUCTURESG)

2005 ◽  
Vol 2005 (0) ◽  
pp. 29
Author(s):  
K. HOKAMOTO ◽  
A. MORI ◽  
M. FUJITA
Keyword(s):  
Pressure Distribution ◽  
Thin Plate ◽  
Explosive Welding ◽  
Shock Pressure ◽  
Impact Behavior ◽  
Uniform Pressure ◽  
Underwater Shock ◽  
Inclined Angle

scholarly journals Pressure Hull Analysis under Shock Loading

2008 ◽  
Vol 15 (1) ◽  
pp. 19-32 ◽  
Author(s):  
Ya-Jung Lee ◽  
Chia-Hao Hsu ◽  
Chien-Hua Huang
Keyword(s):  
Shock Wave ◽  
Pressure Distribution ◽  
High Performance ◽  
Shock Loading ◽  
Shock Pressure ◽  
Structural Arrangement ◽  
Simulation Efficiency ◽  
Long Run ◽  
Underwater Shock ◽  
Initial Shock

The hull of high performance submarines must resist underwater shock loading due to exploding torpedoes or depth bombs. An underwater shock involving an initial shock wave and successive bubble pulsating waves is so complex that a theoretical technique for deriving shock pressure distribution is required for improving simulation efficiency. Complete shock loading is obtained theoretically in this work, and responses of a submarine pressure hull are calculated using ABAQUS USA (Underwater Shock Analysis) codes. In the long run, this deflection and stress data will assist in examining the structural arrangement of the submarine pressure hull.

A New Method of Explosive Welding Performed by Effective Application of Reflected Underwater Shock Wave

2006 ◽  
Author(s):  
Kazumasa Shiramoto ◽  
Masahiro Fujita ◽  
Hirofumi Iyama ◽  
Yasuhiro Ujimoto ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Explosive Welding ◽  
Underwater Explosion ◽  
Shock Pressure ◽  
Experimental Results ◽  
New Method ◽  
Underwater Shock Wave ◽  
Effective Application ◽  
Welding Method ◽  
Underwater Shock

In this report, we propose a new explosive welding method, and the welding is performed at employing underwater shock pressure produced by the underwater explosion of an explosive placed at one side almost vertical to the specimen to be welded. In order to prevent the reduction of the shock pressure with the distance away from explosive, a steel reflector is placed over the area of the specimen. The effects of the reflector are investigated based on the experimental results and the process is numerically analyzed results.

Some Trials on Underwater Explosive Welding of Thin W Plate onto Copper Substrate

2010 ◽  
Vol 638-642 ◽  
pp. 1041-1046 ◽  
Author(s):  
Kazuyuki Hokamoto ◽  
Palavesamuthu Manikandan ◽  
Akihisa Mori
Keyword(s):  
Shock Wave ◽  
Thin Plate ◽  
Explosive Welding ◽  
Copper Substrate ◽  
Base Plate ◽  
Interfacial Microstructure ◽  
Electrical Contacts ◽  
High Heat Flux ◽  
Underwater Shock Wave ◽  
Underwater Shock

The possibility of the use of underwater shock wave to weld a thin plate onto a base plate is demonstrated in the present investigation. The composite materials of tungsten and copper have been used for many applications such as high heat flux components, welding electrodes, electrical contacts at high voltage and heat sink. In this work, thin tungsten plate was tried to weld on a copper base plate using underwater explosive welding technique which has been developed by one of the authors’ group. This technique enables to accelerate a thin plate to several hundreds m/s to satisfy the condition of explosive welding. Such an order of the velocity is adequate to form welding at the interface. In the case of the use of underwater shock wave derived from the detonation of an explosive in water, the kinetic energy required for the welding is appropriate and it makes possible to suppress the effect of heating which may induce excessive melting and/or form brittle intermetallics at the interface. The welding interface showed wavy structure typically found in explosively welded materials and the bonding strength is expected to be high as the clads explosively welded by conventional method. The effect of experimental parameters on the interfacial microstructure is discussed.

Deformation and Collision Process of Metal Plate on Explosive Welding Using Underwater Shock Wave

2002 ◽  
Author(s):  
Hirofumi Iyama ◽  
Masahiro Fujita ◽  
K. Raghukandan ◽  
Kazuyuki Hokamoto ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Explosive Welding ◽  
Amorphous Film ◽  
Simulation Method ◽  
Metal Plate ◽  
Flyer Plate ◽  
Collision Process ◽  
Underwater Shock Wave ◽  
Underwater Shock ◽  
Inclined Angle

Explosive welding using underwater shock wave has been conducted. This technique is a new method of explosive welding and can weld a steel plate with an amorphous film, multi-layer of thin copper plates and so on. The conventional method of usual explosive welding cannot weld these combinations of material. It is possible to change shock pressure acting on the flyer plate easily, because the equipment for this method can change the inclined angle and distance between the explosive and flyer plate. However, we have to understand the mechanism of this method to seek the most suitable for set-up condition. Therefore, the numerical simulation of this method was made. The simulation method was FDM using Lagrangean scheme and it can express the detonation process of explosive, propagation process of underwater shock wave, deformation process of metal plate and collision process of between flyer and base plates. In this paper, these simulation results are discussed.

Explosive Welding Using Underwater Shock Wave Generated by the Detonation of the Detonating Code

2011 ◽  
Vol 673 ◽  
pp. 265-270 ◽  
Author(s):  
Akihisa Mori ◽  
Li Qun Ruan ◽  
Kazumasa Shiramoto ◽  
Masahiro Fujita
Keyword(s):  
Shock Wave ◽  
Sound Velocity ◽  
Detonation Velocity ◽  
Explosive Welding ◽  
New Method ◽  
Underwater Shock Wave ◽  
Metal Plates ◽  
Experimental Parameters ◽  
Underwater Shock ◽  
Point Velocity

Detonating code is a flexible code with an explosive core. It is used to transmit the ignition of explosives with high detonation velocity in the range of 5.5 to 7 km/s. However, it is difficult to use detonating code for the explosive welding of common metals since the horizontal point velocity usually exceeds the sound velocity. Hence, in the present work, a new method using underwater shock wave generated by the detonation of detonating code was tried. The details of the experimental parameters and the results are presented. From the results it is observed that the above technique is suitable to weld thin metal plates with relatively less explosives.

Numerical Simulation on Explosive Welding Process Using Reflected Underwater Shock Wave

2007 ◽  
Vol 566 ◽  
pp. 309-314
Author(s):  
Kazumasa Shiramoto ◽  
Masahiro Fujita ◽  
Yasuhiro Ujimoto ◽  
Hirofumi Iyama ◽  
Shigeru Itoh
Keyword(s):  
Numerical Simulation ◽  
Shock Wave ◽  
Explosive Welding ◽  
Welding Process ◽  
Underwater Shock Wave ◽  
Underwater Shock ◽  
Effective Use

The paper describes a numerically simulated result for the explosive welding using reflected underwater shock wave. Through the numerical simulation, the effective use of reflected underwater shock wave was clearly suggested and the method to improve the assembly was demonstrated.

Development of a laminar boundary layer under conditions of continuous incipient separation

1976 ◽  
Vol 76 (1) ◽  
pp. 55-66 ◽  
Author(s):  
N. Curle
Keyword(s):  
Boundary Layer ◽  
Pressure Distribution ◽  
Laminar Boundary Layer ◽  
Shape Parameter ◽  
Uniform Pressure ◽  
Continuous Change ◽  
Similar Series ◽  
Image Position ◽  
Incipient Separation

SynopsisThis paper, extending the work of Stratford [6] considers a boundary layer with uniform pressure when x < x0, and with the pressure in x > x0 so chosen that the layer is just on the point of separation for all x >x0. The required pressure distribution is shown to beThe displacement and momentum thicknesses are also derived as series in powers of ξ (and log ξ), and the shape parameter H then obtained as a similar series. The continuous change in H from the Blasius value (when ξ = 0) towards the Falkner-Skan [3] separation value is convincingly demonstrated, with the aid of the leading terms of an asymptomatic expansion for large ξ.

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