Adhesive contact： from atomistic model to continuum model

• Published in: Chinese physics B Vol. 20; no. 4; pp. 286 - 294
• Main Author: 樊康旗 贾建援 朱应敏 张秀艳
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.04.2011
• Subjects: 原子模型; 参数模型; 接触模型; 模型显示; 自洽方法; 距离曲线; 连续模型
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/20/4/043401

Two types of Lennard-Jones potential are widely used in modeling adhesive contacts. However, the relationships between the parameters of the two types of Lennard-Jones potential are not well defined. This paper employs a self- consistent method to derive the Lennard-Jones surface force law from the interatomic Lennard-Jones potential with emphasis on the relationships between the parameters. The ei~ect of using correct parameters in the adhesion models is demonstrated in single sphere-flat contact via continuum models and an atomistic model. Furthermore, the adhesion hysteresis behaviour is investigated, and the S-shaped force-distance relation is revealed by the atomistic model. It shows that the adhesion hysteresis loop is generated by the jump-to-contact and jump-off-contact, which are illustrated by the S-shaped force-distance curve.