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首页> 外文期刊>Journal of Manufacturing Processes >Investigation of explosive welding through whole process modeling using a density adaptive SPH method
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Investigation of explosive welding through whole process modeling using a density adaptive SPH method

机译：使用密度自适应SPH方法进行全过程建模的爆炸焊接研究

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摘要

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.
机译：爆炸焊接（EXW）涉及诸如爆炸装药的爆炸，金属结构的冲击以及具有复杂特征（如界面波和射流产生）的强大的流固耦合作用的过程。由于较大的变形和移动界面，整个EXW过程之前尚未得到很好的建模，而EXW固有的关联机制也未得到很好的理解。本文采用密度自适应平滑粒子流体动力学（SPH）模型对整个EXW过程进行了模拟，其中使用密度自适应算法处理EXW中可变的大密度比，并使用核梯度校正（KGC）进行改进。 SPH的计算精度。研究了EXW中的机理，并研究了包括波状界面，射流形成，界面温度和压力分布以及熔融空隙在内的典型现象。研究了波浪形成的机理，并通过当前的SPH模拟揭示了两种现有的机理，即喷射压痕机理和涡旋脱落机理。结果表明，采用适当的炸药量和初始焊接角度，本发明的SPH方法可以很好地再现焊接界面从直形到波浪形，再到具有涡旋脱落的波浪形的演变。此外，基于来自SPH模拟的综合数值数据，给出了EXW的两种数值焊接性窗口，并讨论了不同的焊接极限和有效炸药。

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