Characteristics of the New Explosive Welding Technique Using Underwater Shock Wave-Based on Numerical Analysis
Characteristics of the New Explosive Welding Technique Using Underwater Shock Wave-Based on Numerical Analysis
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水下冲击波爆炸焊接新技术的特点——基于数值分析
DOI：
10.4028/www.scientific.net/msf.465-466.307
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
M. Fujita
中科院分区：
文献类型：
--
作者：
A. Mori;K. Hokamoto;M. Fujita
利用AUTODYN软件对作者开发的水下冲击波爆炸焊接新技术进行了数值模拟，分析了该技术的特点。该焊接方法在以高速均匀地加速薄金属板方面是有效的。但由于高能炸药的使用要求炸药倾斜以降低水平碰撞点速度，因此焊接条件应与水平位置不同。讨论了通过改变炸药厚度来获得波长均匀的波形结构的方法。介绍到目前为止，一些作者已经开发出一种新的方法，爆炸焊接使用水下冲击波，并建议的可能性焊接薄板（S）的基板[1-3]。该方法以高速加速薄板，但使用高能炸药需要所用炸药的倾斜角度。倾斜对于降低水平碰撞点速度至关重要，该速度应低于待焊接材料的声速[4]。就使用固定厚度的炸药而言，施加到飞片上的压力是水平变化的。为了避免焊接条件的这种变化，已经开发了一种方法，以增加炸药的厚度朝向较远的端部，并且使用这种组件导致在焊接界面处的均匀波结构[3]。本研究旨在澄清加压条件适用于不同的组件的基础上的数值模拟飞板。计算结果与实验结果进行了比较。实验图1显示了本研究中使用固定厚度炸药（a）和变厚度炸药（B）的组件。实验用的是日本旭化成公司生产的爆速为7 km/s、密度为1300 kg/m3的SEP炸药。在本研究中，使用铝板（JIS-A5052，1. 0 mm厚）演示了薄铜板（0. 1 mm厚）与低碳钢基体（JIS-SS 400，9. 0 mm厚）的焊接。对于实验，采用0.3 mm的固定支座。Materials Science Forum Online：2004-09-15 ISSN：1662-9752，Vols. 465-466，第307-312页doi：10.4028/www.scientific.net/MSF.465-466.307 © 2004 Trans Tech Publications Ltd，瑞士保留所有权利。未经Trans Tech Publications Ltd（www.scientific.net）的书面许可，不得以任何形式或任何方式复制或传播本文的任何内容。（Semanticscholar.org-11/03/20，14：30：29）表1应用于材料的处理器和状态方程材料处理器状态方程（E.O.S）高爆（SEP）拉格朗日JWL E.O.S（）（）V E VR VR B R V VR A P JWL JWL ω + − − = 2 2 1 1 exp 1 exp 1反射器（PMMA）拉格朗日水欧拉激波（Mie-Grüneisen）E.O.S e s c P 0 0 0 0 0 2 1）1（ρ η η ρ Γ + ρ η ρ Γ − − =（*）激波（Mie-Grüneisen）E.O.S：激波的Mie-Grüneisen形式Hugoniot E.O.S.在哪里; AJWL，BJWL，R1，R2，ω：JWL参数V = ρ0 /ρ（ρ：炸药的初始密度ρ：爆轰产生的气体的密度）η = 1ρ0 /ρ Γ0：（Γ / v）=（Γ0 / v0）Γ：Grüneisen系数c 0：体声速数值模拟使用AUTODYN-2D（世纪Dynamics Inc.）对于图1所示的两种情况。模拟所需的一些参数引用自已发表的结果[5-8]，并分别列于表1和表2中。图2显示了模拟这些情况的计算模型。采用拉格朗日处理器对炸药和反射体进行建模，采用欧拉处理器对水进行建模。通过应用拉格朗日/欧拉相互作用边界条件[8]，对炸药和水之间以及反射器和水之间的相互作用进行建模。图2所示飞板位置上的数字1至9对应于本文下一部分所示计算结果的位置。倾角水砧α雷管电隔爆（SEP）炸药5 m m反射器（PMMA）薄板盖板底板40 mm（SEP）电雷管a：B = a'：B'
The characteristics of the new explosive welding technique using underwater shock wave developed by some of the authors are demonstrated based on the numerical simulation using AUTODYN. The welding method is effective in accelerating a thin metal plate uniformly at a high velocity. But the welding condition should be different with horizontal position because of the use of high-explosive requests inclination of the explosive to decrease the horizontal collision point velocity. The method to obtain the wavy structure with uniform wavelength is discussed by changing the thickness of explosive. Introduction So far, some of the authors have developed a new method of explosive welding using underwater shock wave and suggested the possibility for the welding of thin plate(s) to a base plate [1-3]. The method accelerates a thin plate at a high velocity, but the use of high-explosive requires the inclination angle of the explosive used. The inclination is essential to decrease horizontal collision point velocity, which should be lower than the sound velocity of the materials to be welded [4]. As far as using a fixed-thickness explosive, the pressure applied to the flyer plate is changed horizontally. As to avoid such change in the welding condition, a method to increase the thickness of explosive toward the farther end has been developed, and the use of such assembly leads to a uniform wave structure at the welded interface [3]. The present investigation intends to clarify the pressurizing condition applied to the flyer plate for different assemblies based on numerical simulation. The results are compared with the experimental results. Experimental Fig.1 shows the assembly for the present investigation using fixed-thickness explosive (a) and changed-thickness explosive (b). A high-explosive SEP (detonation velocity 7km/s, density 1300 kg/m 3 ) produced by Asahi-kasei Chemicals Corp. was used for the experiments. In the present investigation, the welding of a thin copper plate (0.1mm-thick) with a mild steel base (JIS-SS400, 9.0 mm-thick) was demonstrated using an aluminum plate (JIS-A5052, 1.0 mm-thick). For the experiments, a fixed stand-off at 0.3 mm was employed. Materials Science Forum Online: 2004-09-15 ISSN: 1662-9752, Vols. 465-466, pp 307-312 doi:10.4028/www.scientific.net/MSF.465-466.307 © 2004 Trans Tech Publications Ltd, Switzerland All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications Ltd, www.scientific.net. (Semanticscholar.org-11/03/20,14:30:29) Table 1 Processor and equation of state applied to materials. Material Processor Equation of State (E.O.S) High-explosive (SEP) Lagrange JWL E.O.S ( ) ( ) V E VR VR B R V VR A P JWL JWL ω ω ω + − − + − − = 2 2 1 1 exp 1 exp 1 Reflector (PMMA) Lagrange Water Euler Shock (Mie-Grüneisen) E.O.S e s c P 0 0 0 0 0 2 1 ) 1 ( ρ η η η ρ Γ + Γ − − = (*) Shock (Mie-Grüneisen ) E.O.S : Mie-Grüneisen form of the shock Hugoniot E.O.S. where; AJWL, BJWL, R1, R2, ω : JWL Parameter V = ρ0 /ρ (ρ : Initial density of explosive ρ : Density of the detonation produced gas) η = 1ρ0 /ρ Γ0 : (Γ / v) = (Γ0 / v0 ) Γ : Grüneisen coefficinet c0 : Bulk sound velocity Numerical simulation The numerical simulation was tried using AUTODYN-2D (Century Dynamics Inc.) for the two cases suggested in Fig. 1. Some parameters required for simulation is cited from published results [5-8] and listed in Table 1 and 2, respectively. Fig. 2 indicates the calculation model to simulate these cases. The high-explosive and the reflector were modeled by the Lagrangian processor, and the water was modeled by the Eulerian processor. The interaction between the explosive and the water, and that between the reflector and the water were modeled by applying the Lagrange/Euler interaction boundary condition [8]. The numbers 1 to 9 on the position of the flyer plate suggested in Fig. 2, corresponds with the positions for calculated results shown in the following part of this paper. Inclination angle Water Anvil α detonator Electric Stand-off (SEP) Explosive 5 m m Reflector (PMMA) Thin plate Cover plate Base plate 40mm (SEP) Electric detonator a : b = a' : b'