Characterization of rate-dependent behaviors of 3d printed material under shear impact

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Richard J. Nash, Yaning Li
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引用次数: 0

Abstract

A thumbtack-shaped specimen is proposed to characterize mechanical properties of material under shearing loads via both static and dynamic compression experiments. The shear strain rate varies in a large range from ∼0.001–1 s-1 to ∼1000 s-1. The specimen consists of three parts: a hard phase thumbtack-shaped nail and hard phase base joined via a softer tubular layer. By compressing the top nail part, the softer tubular layer is under a simple shear stress state. Thus, we named the sample the “thumbtack” specimen, and the type of experimentation it undergoes, the “Nail-It” experiment for characterizing shear-rate dependency of the tubular layer material. Under overall static and dynamic compression with different loading rates, materials in the softer tubular layer can achieve both low and high shearing strain rates accordingly. An analytical solution is derived to quantify the shearing response of the layer under both static and dynamic loading. Thumbtack specimens are fabricated via multi-material polymer jetting. Design guidelines of thumbtack specimen are explored via experiments on the 3D printed specimens. A series of impact tests are performed via a drop tower to characterize the shear-rate dependent behavior of the 3D printed soft layer material. This type of experiment offers a cost-effective, controlled, and highly reproducible approach to characterizing the dynamic shear response of materials, particularly 3D-printed materials/structures, under impact loading, providing more reliable, application-specific, and scalable material characterization compared to existing methods.
剪切冲击下3d打印材料速率相关行为的表征
通过静态和动态压缩实验,提出了一个图钉形试样来表征材料在剪切载荷下的力学性能。剪切应变速率在~ 0.001-1 s-1到~ 1000 s-1的大范围内变化。该试样由三部分组成:硬相图钉状钉和硬相基底,通过较软的管状层连接。通过压缩顶钉部分,较软的管状层处于简单剪应力状态。因此,我们将该样品命名为“图钉”样品,并将其进行的实验类型命名为“钉-钉”实验,以表征管状层材料的剪切速率依赖性。在不同加载率的整体静态和动态压缩下,较软管状层中的材料可以实现相应的低和高剪切应变率。导出了层在静、动荷载作用下的剪切响应的解析解。采用多材料聚合物喷射法制备图钉试件。通过对3D打印标本的实验,探讨了图钉标本的设计准则。通过跌落塔进行了一系列冲击测试,以表征3D打印软层材料的剪切速率相关行为。这种类型的实验提供了一种具有成本效益,可控且高度可重复性的方法来表征材料,特别是3d打印材料/结构在冲击载荷下的动态剪切响应,与现有方法相比,提供了更可靠,特定应用和可扩展的材料表征。
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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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