求解体积的有限元方法,用Fortran编写的一个程序，里面用到了等参单元的概念，对于想学习有限元的同学来说，极好的 一个程序。

备注（程序里面的单元为8节点的solid45单元及其退化单元）-Finite element method for solving the volume with a program written in Fortran, which uses the concept of isoparametric, finite element for the students want to study for an excellent program. Remarks (Program for the 8-node element inside the cell and its degradation solid45 unit)