State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, P. R. China
Adv. Mater. Lett., 2019, 10 (2), pp 112-115
DOI: 10.5185/amlett.2019.2187
Publication Date (Web): Dec 19, 2018
Copyright © IAAM-VBRI Press
E-mail: weifu.sun@bit.edu.cn
Hardening effect is often observed in either experiments or simulations. And several continuum models or semi-empirical theories have been proposed to explain the origin, such as constraint-counting theory, the bond-order-length-strength (BOLS) correlation mechanism, equations of state-Murnaghan relationship, etc. However, the validity of these models or theories at the nanoscale have not been tested. In this work, high-speed head-on impact between silicon nanoparticles were studied using molecular dynamics (MD) simulations and their contact mechanics behaviours including contact force versus nominal displacement relationship were explored and the pronounced hardening effect was clearly observed. That’s, apparent Young’s modulus yielded is much higher than that of their bulk materials. The structure of silicon nanoparticles after compression was analysed in terms of bond length, bond angle, coordination number. The three existing relevant models were separately examined. The results show that any single of the three known theories cannot explain the higher elastic modulus obtained in present MD simulation. Probably, the three aspects contribute together to the hardening effect. This area awaits much more mature theory to explain the hardening effect under the influence of the dynamic effect.
Professor Prasad Yarlagadda’s Research Well Adopted as per needs of Engineering Industry
The Perspective of a Homogenization Approach for Effective Local and Non-local Response of the Elastic Wave Properties of Phononic Metamaterials
Reactor Cycling of Granulated Ca(OH)2 Encapsulated with Chemically Modified Semipermeable Shell Materials
Nanotoxicological Assessments to Warranty the use of Functionalized Y2O3 Nanoparticles for Biomedical Applications
Comparison of Photocatalytic Efficiency of TiO2 and In2S3 Thin Films under UV and Visible Light Irradiance
Application of Rice Husk Ash as Thermal Insulation Materials
Synthesis and Characterization of Green CuO using Centella Asiatica Plant Leaf Extract: Electrochemical and Photocatalytic Activities
Dielectric Relaxation and Suitability of Scaling parameters study on Mn0.7+xZn0.3SixFe2-2xO4 (x = 0.0 - 0.3) Ferrites
Synthesis and Screen Printing of Dopant Free Nano-crystalline SnO2 (101) Thick Film for Gas Sensor Application
Water and Sanitation Management: During and after COVID-19 Pandemic
Polymeric Energy Materials: Development and Challenges
Influence of Different Copolymer Based Compatibilizers on Performance of Pristine and Recycled PP/PE blends
Bio Ceramics: New Material from Mangrove Bark
Hybrid Physical Chemical Vapour Deposition (HPCVD) of Superconducting MgB2 Thin Films on three Dimensional Copper Substrates
Photoinduced Electron Transfer Reactions of tris(4,4’-dimethoxy-2,2’-bipyridyl)ruthenium(II)cation with Quinones in Aqueous Medium
A Comparative Study of Green Synthesized AgNPs using Carissa Carandas and Nerium indicum Leaves and its Activities against Selected Human Pathogens and MCF 7 Cell
Design and Modelling of Carbon Fiber Grid Structure based Carbon/Epoxy Composites for Enhanced Microwave Absorbing Properties
Elaboration and Characterization of Macroporous Bioceramics using Polymeric Sponge Replication Method
Copyright ©2010-2020 VBRI Press
Full Article