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161 results on '"Yuan, Ju"'

1. Molecular Dynamics Simulation of Shock Wave Propagation in Aluminum Single Crystal

Author

Yuan Yuan Ju and Lei Zhang

Subjects
Earth-Surface Processes
Abstract

The characteristics of shock wave propagation in aluminum single crystal are simulated by using the molecular dynamics (MD) method based on the embedded atom method (EAM) potential function. The structure of the shock front and the Hugonoit relation are obtained. The simulated results show that a two-wave structure exists in the aluminum single crystal for the particle velocity bellower than 2 km/s and the velocity of the elastic wave increases slightly with the shock loading. While only plastic wave exists in the aluminum single crystal for the particle velocity higher than 2 km/s and the width of the shock front decreases by exponent with the normal stress. The MD simulation results are basically consistent with the experimental results.

Published
2023
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2. A Model for Predicting the Failure Behavior of Bimodal Nanocrystalline Materials

Author

Rong Yuan Ju, Xiao Dong Mi, Ying Guang Liu, Hong Jian Yu, Xiu Lei Peng, and Song Feng Tian

Subjects
Materials science, Particle-size distribution, Volume fraction, General Engineering, Composite material, Ductility, Grain size, Nanocrystalline material
Abstract

Giving a bimodal grain size distribution in nanocrystalline materials can effectively achieve both high strength and high ductility. Here we propose a theoretical model to study the failure behavior of nc materials with bimodal grain size distribution. The dependence of failure properties on grain size distribution were calculated. Numerical results show the strength and ductility of bimodal nanocrystalline materials are sensitive to grain size and the volume fraction of coarse grains.

Published
2014
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3. Analysis on EFP Penetrating against Water-Partitioned Armor

Author

Qingming Zhang, Yuan Yuan Ju, Zi Zheng Gong, and Li Yang

Subjects
Shock wave, Engineering, Shaped charge, Computer simulation, Armour, business.industry, Mechanical Engineering, Structural engineering, Warhead, Mechanics of Materials, Deflection (engineering), General Materials Science, Attenuation law, business
Abstract

Based on the experiments and numerical simulation of EFP penetrating against the water-partitioned armor, the velocity attenuation law of EFP in water is obtained by dimensional analysis. The relationship between the pressure of the water shock wave and the deflection of the latter target is established, which is validated by the experimental results. The influence of the water shock wave on the motion of EFP is also analyzed. The results in this paper provide remarkable benchmark in designing and optimizing the liner, as well as increasing the damage efficiency of the torpedo warhead.

Published
2013
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4. Finite Element Analysis for the Temperature and Stress Fields of the Diesel Piston Based on CAE

Author

Yuan Ju Yu, Xiao Li Yang, Xiao Bo Li, and Wen Fu Sun

Subjects
Engineering, Deformation (mechanics), business.industry, General Engineering, Mechanical engineering, Finite element method, Abrasion (geology), law.invention, Stress (mechanics), Stress field, Diesel fuel, Piston, law, Head (vessel), business
Abstract

Adopting the finite element software ANSYS, this paper calculates the temperature and stress fields of the combined piston under the conditions of cooling and no cooling. The analytical results show that the piston under no cooling condition has higher thermal load and integrative stress than the condition of cooling, because the piston head can’t get better cooling. Moreover, the high thermal load causes the piston head creating great deformation, which has exceeded the normal gap between the piston and the liner, so the piston abrasion may worsen.

Published
2012
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