利用平滑粒子流体力学 (SPH) 对异种金属材料的补焊摩擦搅拌点焊进行数值研究

IF 2.3 3区 工程技术 Q2 MECHANICS
Khalegh Salami, Reza Abdi Behnagh, Mohsen Agha Mohammad Pour, Roberto Brighenti
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引用次数: 0

摘要

填充式搅拌摩擦点焊(RFSSW)已在多个工业领域得到应用,尤其是在交通和汽车领域。然而,RFSSW 过程建模主要采用经验方法。与此同时,文献中的一些数值研究也对其中涉及的关键物理现象进行了解释和预测。本研究采用完全拉格朗日方法--平滑粒子流体力学(SPH)来模拟 RFSSW。拉格朗日粒子法可以模拟发生大变形、界面动态变化、空洞形成、材料温度和应变演变的材料,而无需使用传统网格法通常需要的复杂跟踪方案。以镁与钢的焊接模拟为例,介绍了所涉及的所有主要热机械现象。温度、应力和应变场历史以及过程中发生的材料流动被确定为 RFSSW 鉴定的特征方面;通过比较预测和实验测量的焊接温度,验证了所提出的计算方法。所获得的结果表明,SPH 是焊接设计和工艺优化的可靠工具,可提供精确评估焊接区域的质量、机械特性和材料流动所需的相关物理信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Numerical study of refill friction stir spot welding of dissimilar metallic materials using smoothed particle hydrodynamics (SPH)

Numerical study of refill friction stir spot welding of dissimilar metallic materials using smoothed particle hydrodynamics (SPH)

Refill friction stir spot welding (RFSSW) has found several industrial applications, especially in the transportation and automotive sectors. However, modeling the RFSSW process has been tackled mainly with empirical approaches. At the same time, the key physical phenomena involved have been explained and predicted by a few numerical studies in the literature. This study uses a fully Lagrangian method, smoothed particle hydrodynamics (SPH), for the simulation of RFSSW. The Lagrangian particle method simulates materials undergoing large deformation, interface dynamic changes, void formations, material temperature, and strain evolution without using complex tracking schemes often required by traditional grid-based methods. As a relevant example, magnesium-to-steel welding simulation is presented by accounting for all the main thermo-mechanical phenomena involved. Temperature, stress, and strain field histories as well as material flow taking place during the process, are determined as characteristic aspects for qualification of RFSSW; the proposed computational approach is validated by comparing the predicted and experimentally measured welding temperature. The results obtained demonstrate that SPH is a reliable tool for welding design and process optimization and provides the information related to the involved physics needed to precisely evaluate the quality, the mechanical characteristics, and the material flow of the joined region.

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来源期刊
Acta Mechanica
Acta Mechanica 物理-力学
CiteScore
4.30
自引率
14.80%
发文量
292
审稿时长
6.9 months
期刊介绍: Since 1965, the international journal Acta Mechanica has been among the leading journals in the field of theoretical and applied mechanics. In addition to the classical fields such as elasticity, plasticity, vibrations, rigid body dynamics, hydrodynamics, and gasdynamics, it also gives special attention to recently developed areas such as non-Newtonian fluid dynamics, micro/nano mechanics, smart materials and structures, and issues at the interface of mechanics and materials. The journal further publishes papers in such related fields as rheology, thermodynamics, and electromagnetic interactions with fluids and solids. In addition, articles in applied mathematics dealing with significant mechanics problems are also welcome.
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