关于stress strain的 网站，可以作为一个参考书籍

网站链接：http://www.efunda.com/formulae/solid_mechanics/mat_mechanics/hooke_isotropic.cfm

一个很不错关于solid mechanics的online book：http://homepages.engineering.auckland.ac.nz/~pkel015/SolidMechanicsBooks/Part_I/

paper “Interactive Virtual Materials” 用一个用matrix描述的方法，来仿真变形，对于编程计算比较方便

Notation

Deformation Gradient

the deformation F is defined as

strain

strain can be denoted by a 3*3 symmetric matrix:

cauchy strain:   

Green strain:

stress-strain relation

, 

strain energy density

or

with

    .