A digital-twin driven Split Hopkinson bar layout for the tensile characterization of thin, low impedance, sheet-like materials

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-08-25 DOI:10.1016/j.ijimpeng.2024.105098
Georg Baumann , Caterina Czibula , Ulrich Hirn , Florian Feist
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Abstract

The Split Hopkinson or Kolsky bar is one of the most popular devices when it comes to the mechanical characterization of material samples under high strain-rates. While testing of high impedance materials, such as metal alloys, is relatively straight forward, samples with low impedance pose certain challenges. The present work focuses on the detailed implementation of a high strain-rate tensile testing method for thin, low impedance, sheet-like materials by using the Split Hopkinson test principle. In order to find a suitable Split Hopkinson setup a digital twin was created using explicit finite element methods. With the help of the digital twin, the design of the transmission bar and the sample holders including the friction liners were explored. The numerical model indicated, that a hollow transmission bar with a moderate tapering (hollow bar 1.0) is suited for the characterization of low impedance materials over a wide strain-rate range. Furthermore, this setup has to be combined with an asymmetrical sample holder configuration (heavier on the incident side and lighter on the transmission side) and aluminum friction liners to return accurate results. This numerically derived setup was validated against experimental tests on paper, representative of low impedance, sheet-like materials.

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用于表征薄型低阻抗片状材料拉伸特性的数字双驱动分体式霍普金森棒布局
在对高应变速率下的材料样品进行机械特性分析时,分体式霍普金森或科尔斯基棒是最常用的设备之一。虽然金属合金等高阻抗材料的测试相对简单,但低阻抗样品的测试却面临着一定的挑战。本研究的重点是利用斯普利特-霍普金森(Split Hopkinson)测试原理,对薄而阻抗低的片状材料详细实施高应变速率拉伸测试方法。为了找到合适的斯普利特-霍普金森装置,我们使用显式有限元方法创建了一个数字孪生装置。在数字孪生模型的帮助下,对传动杆和样品支架(包括摩擦衬垫)的设计进行了探讨。数值模型表明,具有适度锥度(空心棒 1.0)的空心传输棒适合在较宽的应变速率范围内对低阻抗材料进行表征。此外,该装置必须与不对称样品支架配置(入射侧较重、传输侧较轻)和铝摩擦衬垫相结合,才能获得准确的结果。这一数值推导出的装置通过对纸张的实验测试进行了验证,纸张是低阻抗片状材料的代表。
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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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