{"title":"The achievement of constant strain rates in electromagnetic Hopkinson bar test","authors":"","doi":"10.1016/j.ijimpeng.2024.105121","DOIUrl":null,"url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":50318,"journal":{"name":"International Journal of Impact Engineering","volume":null,"pages":null},"PeriodicalIF":5.1000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Impact Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0734743X2400246X","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
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.
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