Numerical simulation of shear jamming in a shear thickening fluid under impact

IF 2.3 3区工程技术 Q2 MECHANICS

Rheologica Acta Pub Date : 2023-03-20 DOI:10.1007/s00397-023-01391-2

Xiaoyu Cui, Hongjian Wang, Lin Ye, Kunkun Fu

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Abstract

Shear thickening fluids (STFs) exhibit a liquid–solid-like transition under impact because of the formation and evolution of shear jamming in the STFs. This study aims to develop a computational fluid dynamics (CFD) model to simulate the shear jamming formation and evolution in a concentrated STF under impact for the optimum design of the STF applications. The STF was defined with a strain rate–dependent viscosity and compressibility. In the CFD model, the interface between air and STF was modelled by the volume of fluid method to solve the multiphase flow problem. In addition, the impact penetration process of an impactor was reproduced by the change of the fluid domain shape with a dynamic mesh method. The shear jamming was demonstrated clearly by a high strain–rate region caused by the impact. The numerical results were comparable to the experimental observations of shear jamming evolution using a high-speed camera. Furthermore, the numerical results showed that the effect of the STF’s dimensions (depth and diameter) on the expansion rate of the shear jamming was insignificant.

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剪切增稠流体在冲击作用下剪切干扰的数值模拟

剪切增稠流体(STFs)在冲击作用下表现为液固类转变，这是由于STFs内部剪切干扰的形成和演化。本研究旨在建立计算流体动力学(CFD)模型，模拟集中STF在冲击作用下剪切干扰的形成和演化，为STF应用的优化设计提供依据。STF定义为与应变速率相关的粘度和压缩率。在CFD模型中，采用流体体积法模拟空气与STF的界面，解决多相流问题。此外，采用动态网格法通过流体域形状的变化再现了冲击器的冲击侵彻过程。碰撞产生的高应变率区域清楚地表明剪切干扰。数值结果与高速相机剪切干扰演化的实验观测结果相吻合。此外，数值结果表明，STF的尺寸(深度和直径)对剪切干扰的扩展速率的影响不显著。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."