原子相互作用势对固体弹性模量的影响

The Influences of the Atomic Interaction Potential On the Solid Elastic Modulus

分别导出了L J和Morse相互作用势作用下面心立方结构的惰性元素晶体和金属晶体的弹性模量随压强的变化规律,讨论了原子相互作用势以及原子振动非简谐效应对固体弹性模量的影响.结果表明:在一级近似下简谐系数和第二非简谐系数对弹性模量随压强变化规律无影响;第一非简谐系数的存在使弹性模量增大.

The elastic modulus of inert element crystal and metal crystal with fcc structure depended on pressure in L-J and Morse interaction are obtained respectively. The influences of the atomic interaction potential and the atomic vibration non-simple harmonic effect on the solid elastic modulus are mainly discussed. It shows that simple harmonic coefficient and the second order non-simple harmonic coefficient dont influence it. The first order non-simple harmonic coefficient enhances modulus.