Dynamic three-point bending tests under high loading rates

被引：0
|
作者：
Chen T. [1 ]
Jiang Q. [1 ,2 ]
Xue J. [3 ]
Harvey C.M. [4 ,5 ]
Zhang X. [6 ]
Silberschmidt V.V. [7 ]
Liu Y. [8 ]
Zhang K. [1 ,2 ]
Wang S. [4 ,5 ]
Wei B. [1 ,2 ]
机构：
[1] Key Laboratory of Microgravity (National Microgravity Laboratory), Institute of Mechanics, Chinese Academy of Sciences, Beijing
[2] School of Engineering Science, University of Chinese Academy of Sciences, Beijing
[3] State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing
[4] Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicestershire
[5] School of Mechanical and Equipment Engineering, Hebei University of Engineering, Handan
[6] Centre for Manufacturing and Materials Engineering, Coventry University, Coventry
[7] Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire
[8] School of Physics, Engineering and Computer Science, University of Hertfordshire, Hatfield, Hertfordshire
来源：
Thin-Walled Structures | 2023年 / 188卷
基金：
中国国家自然科学基金;
关键词：
Beam dynamics; Dynamic normal stress; Dynamic shear stress; Structural vibration; Three-point bending test;
D O I：
10.1016/j.tws.2023.110836
中图分类号：
学科分类号：
摘要：
The theory of dynamic three-point bending tests under high-loading rates is developed for the first time with account for structural vibration. Analytical solutions for dynamic normal (flexural) and shear stresses are derived. To study the dynamic effect, dynamic factors for both types of stresses are defined and investigated by employing a dimensionless characteristic time and a strain rate. It is found that both dynamic factors attenuate with respect to the characteristic time and, therefore, the quasi-static time thresholds and loading conditions are obtained. In addition, the dominant failure mode is studied for potential application in brittle materials in terms of normal-to-shear stress ratio, which is oscillatory in contrast to the quasi-static case. The developed theory is verified with a split Hopkinson bar test together combined with digital image correlation as well as finite-element simulations. The findings of this study can provide a guideline for test design, such as selection of specimen geometry and loading rate. As the theory provides a modal decomposition of dynamic normal and shear stresses, it can also be used in the field of structural health monitoring. © 2023 Elsevier Ltd
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