分子动力学探究内耗讲授方法

TEACHING METHODS OF INTERNAL FRICTION VIA MOLECULAR DYNAMICS

固体内耗是固体材料在振动中所引起的能量损耗,与其阻尼性能密切相关,在微观上是原子弛豫及原子结构演化的反映,能够加深对固体材料缺陷弛豫动力学的理解。分子动力学是研究固体材料的重要方法,可在微观上直观观测结构及动力学演化,具有目前实验不可企及的优势。本文从理论推导固体内耗参数,并应用分子动力学方法给予表征,结合上机实验加深同学们对固体内耗的理解,进一步概述固体内耗研究前沿,这对于固体力学粘弹性教学具有重要启发价值。本文结合固体内耗理论知识及作者多年的内耗研究成果,从教学方法改革、教学内涵及教学过程设计等多方面探讨该课程教学,讲授了固体内耗本质及分子动力学在内耗方向的应用,深化了固体内耗教学效果。

Internal friction,as a kind of energy dissipation caused by vibration in solid materials,is closely related with the property of damping and can reflect atomic dynamics and structural information in microscopic view,that plays a critical role in understanding in relaxation dynamics of defects in materials.Molecular dynamics is an important approach of investigating properties of solid materials,having an unattainable advantage in observing the evolution of atomic dynamics and structure.Based on the theory of solid,the concept and parameters of internal friction were introduced in the current work.Combined with molecular dynamics method,the internal friction was characterized by a kind of quantitative parameter and the evolution of direct structure and dynamics were observed.What is more,the frontier progress of internal friction in dynamics relaxation and structure is summarized,which has an important enlightening value for the teaching process of viscoelastic mechanics.Based on the theory and research results of internal friction for recent years,this paper investigates the innovation of teaching methods,teaching connotation,and teaching links,which is applied to the mechanism of internal friction and molecular dynamics,further enhances the teaching effect in internal friction.