The effect of friction characteristics on electromagnetic impact deformation mechanism of 2A10 aluminum alloy bars

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL Industrial Lubrication and Tribology Pub Date : 2024-07-10 DOI:10.1108/ilt-05-2024-0154

Xu Zhang, Kangjie Tang, Yingyu Wang, Dongying Dong

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Abstract

Purpose

The purpose objective of this study is to identify the friction coefficient and friction effect in electromagnetic upsetting (EMU) high-speed forming process.

Design/methodology/approach

Based on numerical simulation and upsetting experiment of 2A10 aluminum alloy bar, the friction coefficient between contact surfaces is obtained by combining the fitting displacement distribution function and the electromagnetic-mechanical coupling numerical model, and the influence of friction effect is analyzed.

Findings

The maximum impact velocity and acceleration during EMU are 13.9 m/s and −3.3 × 106 m/s², respectively, and the maximum strain rate is 7700 s⁻¹. The functional distribution relationship between friction coefficient combination (FS, FD) and characteristic parameters [upper diameter (D1) and middle diameter (D2)] is established. The values of FS and FD are 0.1402 and 0.0931, respectively, and the maximum relative error is 2.39%. By analyzing the distribution of equivalent stress and strain, it is found that plastic deformation has obvious zoning characteristics and there is serious failure concentration in the strong shear zone.

Originality/value

Friction coefficient significantly affects stress or strain distributions in material forming process, but it is difficult to obtain friction coefficients through experimental tests in the high-speed forming process. In this paper, a multi-field coupling numerical model is proposed to determine friction coefficients and applied to the electromagnetic impact loading process (a high-speed forming process).

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2024-0154/

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摩擦特性对 2A10 铝合金棒材电磁冲击变形机理的影响

设计/方法/途径基于 2A10 铝合金棒材的数值模拟和镦粗实验，结合拟合位移分布函数和电磁机械耦合数值模型，得到接触面间的摩擦系数，并分析了摩擦效应的影响。结果电磁耦合过程中的最大冲击速度和加速度分别为 13.9 m/s 和 -3.3 × 106 m/s2，最大应变率为 7700 s-1。建立了摩擦系数组合（FS、FD）与特征参数[上直径（D1）和中直径（D2）]之间的函数分布关系。FS 和 FD 的值分别为 0.1402 和 0.0931，最大相对误差为 2.39%。通过分析等效应力和应变的分布，发现塑性变形具有明显的分区特征，在强剪切区存在严重的失效集中现象。本文提出了一种多场耦合数值模型来确定摩擦系数，并将其应用于电磁冲击加载过程（一种高速成形过程）。同行评议本文的同行评议历史见：https://publons.com/publon/10.1108/ILT-05-2024-0154/。

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来源期刊

Industrial Lubrication and Tribology 工程技术-工程：机械

CiteScore

3.00

自引率

18.80%

发文量

129

审稿时长

1.9 months

期刊介绍： Industrial Lubrication and Tribology provides a broad coverage of the materials and techniques employed in tribology. It contains a firm technical news element which brings together and promotes best practice in the three disciplines of tribology, which comprise lubrication, wear and friction. ILT also follows the progress of research into advanced lubricants, bearings, seals, gears and related machinery parts, as well as materials selection. A double-blind peer review process involving the editor and other subject experts ensures the content''s validity and relevance.