Shaoxiang Cai¹, Yuliang Guo¹, Yanjun Li^2,*

Journal of Renewable Materials, Vol.10, No.1, pp. 119-133, 2022, DOI:10.32604/jrm.2022.016260

Abstract In this study, Pinus massoniana Lamb at different heights, across the annual rings, and between earlywood and latewood was measured by X-ray diffraction and the chemical composition was analyzed by chemical treatment. Results indicated that the microfibril angle (MFA) decreased and the chemical composition changed little with the increase in height from 1 m to 9 m. In the radial direction, the MFA decreased and the chemical composition changed little with an increase in annual rings. The cellulose content of latewood was higher than that of earlywood. The viscoelastic changes of wood cell walls at different heights, across the annual rings by… More >

Xiaozhi Tang, Yafang Guo, Yu Gao

The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.1, pp. 25-26, 2011, DOI:10.3970/icces.2011.020.025

Abstract Atomistic simulations were performed to study the nano-indentation for two kinds of FCC metals, aluminum and copper. Two different deformation mechanisms were observed in our simulation under exactly the same simulation condition. An embedded atom method potential was employed for copper and a generalized form of EAM potential due to Finnis and Sinclair for aluminum. In the simulation model, the substrate was constructed with 78408 atoms in an 8I?*40I?*60I? cell, here I? means the lattice constant. The indenter was modeled by a cubic with its side length of 8a.During the simulation, the period boundary condition was applied to the (1… More >

Tei-Chen Chen^1,2, Heng-Chieh Wang¹, Shu-Fan Wu¹, Yen-Hung Lin¹

The International Conference on Computational & Experimental Engineering and Sciences, Vol.9, No.4, pp. 247-262, 2009, DOI:10.3970/icces.2009.009.247

Abstract Mechanical properties of materials in the micro- and nano-meter scale have been successfully obtained by using the indentation technique. Up to now, large-scale atomistic models to simulate the experimental condition, however, still remain computationally demanding. In this article, a simple and accurate method is proposed to derive the intermolecular potential functions of coarse-grained molecular dynamics (CGMD) suitable for various single crystalline materials. This CGMD technique is then provided to simulate nano-indentation process to verify its accuracy and reliability. Simulation results evaluated by CGMD approach are obtained and compared to those predicted by MD. It is found that the results predicted… More >