Numerical and experimental studies of the mechanism of the wavy interface formations in explosive/impact welding
Numerical and experimental studies of the mechanism of the wavy interface formations in explosive/impact welding
复制标题
DOI：
10.1016/j.jmps.2005.06.001
复制
发表时间：
2005-11-01
影响因子：
5.3
通讯作者：
Al-Hassani, STS
中科院分区：
文献类型：
--
作者：
Mousavi, AAA;Al-Hassani, STS
爆炸驱动冲击焊接是多学科研究的一个真正的例子，因为与之相关的现象属于工程科学的各个分支。在这一问题上，各专业领域的大量工作和合作都已展开。然而，一个全面的定量理论，能够给出一个准确的描述和预测的参数和爆炸焊接部件的特性还不存在。大多数研究人员认为焊接过程是固态焊接过程，但有些人认为该过程是熔焊过程。界面波是爆炸焊接中讨论最多的方面。在碰撞区域中射流的存在，以及在高压下的瞬态流体状行为，导致许多研究人员寻求一种解释和这些波的特性方面的一种或另一种流动力学。在这项研究中，焊接过程的一部分进行了数值分析。使用有限差分工程包来模拟薄飞板对相对较厚的基底的斜撞击。结果进行了验证的数据，从仔细控制的实验，使用气动枪。模拟了直界面和波状界面以及射流现象，并预测了波的大小和射流速度。数值分析预测碰撞点前方会有一个隆起。波的形成似乎是在碰撞点的速度分布和材料的周期性扰动的变化的结果。在波浪形界面中预测了较高的塑性应变值。粘结被认为是固态焊接过程。发生的相变可能是由于碰撞点处的高温（但低于熔化温度）。(c)2005爱思唯尔有限公司保留所有权利。
Explosively driven impact welding is a true example of multidisciplinary research as the phenomena associated with it fall under the various branches of engineering science. A great deal of the work in, and collaboration between various specialised fields have been expended on the subject. However, a comprehensive quantitative theory capable of giving an accurate description and prediction of the parameters and of the characteristic features of explosively welded components does not exist. Most of the investigators considered the welding process as a solid state welding process, but some believed that the process is a fusion welding process. Interfacial waves are the most discussed aspect of explosive welding. The presence of jet in the collision region, and the transient fluid-like behaviour under high pressure have led many investigators to seek an explanation and a characterisation of these waves in terms of a flow mechanics of one kind or another. In this study, part of the welding process was numerically analysed. A finite difference engineering package was used to model the oblique impact of a thin flyer plate on a relatively thick base. The results were validated by data from carefully controlled experiments using a pneumatic gun. Straight and wavy interfaces and jetting phenomena were modelled, and the magnitude of the waves and the velocity of jet predicted. The numerical analysis predicted a hump ahead of the collision point. Wave formation appears to be the result of variations in the velocity distribution at the collision point and periodic disturbances of the materials. Higher values of plastic strain were predicted in wavy interfaces. Bonding was found to be a solid state welding process. Phase changes which occur may be due to high temperatures (but less than the melting temperature) at the collision point. (c) 2005 Elsevier Ltd. All rights reserved.