The achievement of constant strain rates in electromagnetic Hopkinson bar test

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-09-12 DOI:10.1016/j.ijimpeng.2024.105121
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Abstract

During the electromagnetic Hopkinson bar test, a sinusoidal shape of the stress wave could be generated and applied to the specimen. It is difficult to achieve a constant strain rate during the tests for the metal materials. This paper introduces a novel technique that can generate a bilinear shape of the stress wave based on the Fourier transform in which the multiple sinusoidal waves are superimposed. The mechanism of stress wave generation is analyzed theoretically and simulated numerically. On this basis, a new set of electromagnetic Hopkinson bar experimental equipment is set- up. The dynamic compression test of the material is carried out by the experimental device. The experimental results demonstrate that the specimens have a constant strain rate when subjected to bilinear stress wave impact. The regulation of stress wave shape can also be controlled by adjusting the electromagnetic emission parameters. Hence, the application scope of the ESHB technique in investigating dynamic properties can be expanded to various types of materials.
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在电磁霍普金森棒试验中实现恒定应变率
在电磁霍普金森棒试验中,可产生正弦波形的应力波并施加到试样上。对于金属材料来说,很难在试验过程中实现恒定的应变率。本文介绍了一种基于傅立叶变换的新技术,该技术可产生双线性应力波,其中多个正弦波叠加在一起。本文对应力波的产生机理进行了理论分析和数值模拟。在此基础上,建立了一套新的电磁霍普金森棒实验设备。实验设备对材料进行了动态压缩试验。实验结果表明,试样在受到双线性应力波冲击时具有恒定的应变速率。应力波形状的调节也可以通过调整电磁发射参数来控制。因此,ESHB 技术在研究动态特性方面的应用范围可以扩展到各类材料。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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