之前使用学校的自动升级程序安装的 Abaqus 6.14.3 居然没有自动连接 Fortran 编译器，导致使用用户子程序的时候发生编译错误。试了好半天才找到解决办法，记录备查。
Because of carelessness, I ran into a ‘problem during linking’ error in Abaqus. The mistake was misspelling a dimensional variable name. That caused the variable used had not been declared.
VUMAT can be implemented to a model which has more than one user custom materials, using cmname variable to identify the materials.