Investigation of explosive welding through whole process modeling using a density adaptive SPH method
Investigation of explosive welding through whole process modeling using a density adaptive SPH method
复制标题
使用密度自适应 SPH 方法通过全过程建模研究爆炸焊接
DOI：
10.1016/j.jmapro.2018.08.004
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发表时间：
2018-10
影响因子：
6.2
通讯作者：
Liu M. B.
中科院分区：
文献类型：
--
作者：
Zhang Z. L.;Feng D. L.;Liu M. B.
爆炸焊接（EXW）涉及爆炸装药的引爆、金属结构的冲击以及具有复杂特征（如界面波和射流产生）的强烈流体-结构相互作用等过程。由于大变形和移动界面，整个EXW过程以前没有被很好地模拟，同时EXW中固有的相关机制也没有被很好地理解。本文采用密度自适应光滑粒子流体动力学（SPH）模型对EXW过程进行了数值模拟，该模型采用密度自适应算法处理EXW过程中的变大密度比问题，并采用核梯度修正（KGC）提高SPH模型的计算精度。研究了EXW中的机理，分析了典型现象，包括波状界面、射流形成、界面温度和压力分布以及熔化空洞。研究了波浪的形成机制，揭示了现有的两种机制，即射流压痕机制和涡脱落机制。结果表明，在适当的装药量和初始焊接角度下，SPH方法能够较好地再现焊接界面由平直到波状，再到波状并伴有旋涡脱落的形态演化过程。基于SPH数值模拟得到的综合数据，给出了EXW焊接性数值窗口的两种类型，并讨论了不同焊接极限和有效装药量。
Explosive welding (EXW) involves processes like the detonation of explosive charge, impact of metal structures and strong fluid-structure interaction with complex features such as interfacial waves and jet generation. The whole EXW process has not been well modeled before due to the large deformation and moving interfaces while the associated mechanisms inherent in EXW are also not well understood. In this paper, the whole EXW process is simulated using a density adaptive smoothed particle hydrodynamics (SPH) model, in which a density adaptive algorithm is used to treat variable large density ratio in EXW and the kernel gradient correction (KGC) is used to improve computational accuracy of SPH. The mechanisms in EXW are investigated, and typical phenomena including the wavy interface, jet formation, interfacial temperature and pressure distribution as well as melting voids are examined. The mechanisms of wave formation are studied while two existing mechanisms, namely, the Jet Indentation Mechanism and the Vortex Shedding Mechanism are revealed with the present SPH simulations. It is demonstrated that with proper amount of explosive charge and initial welding angle, the present SPH method can well reproduce the morphology evolution of the welding interface from straight to wavy and further to wavy with vortex shedding. Furthermore, based on comprehensive numerical data from SPH simulations, two types of numerical weldability windows for EXW are presented together with discussions about different welding limits and effective explosive charge.
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影响因子：
5.1
作者：
S. Salem;L. Lazari;S. Al-Hassani
通讯作者：
S. Salem;L. Lazari;S. Al-Hassani
影响因子：
5.1
作者：
C. Mader
通讯作者：
C. Mader
影响因子：
5.1
作者：
S. Ma;Xiong Zhang;X. Qiu
通讯作者：
S. Ma;Xiong Zhang;X. Qiu
影响因子：
7.3
作者：
S. Reid
通讯作者：
S. Reid
DOI：
10.1016/s0045-7825(01)00254-7
发表时间：
2001-01-01
影响因子：
7.2
作者：
Gray, JP;Monaghan, JJ;Swift, RP
通讯作者：
Swift, RP