用于abaqus二次开发vumat子程序，适用于三维梁单元的线弹性模型-Secondary development of abaqus vumat subroutine, be applicable to the linear elastic model of three-dimensional beam element

abaqus二次开发vumat子程序，适用于三维梁单元的弹塑性本构模型，采用Kent-Park受压应力应变全程曲线-abaqus secondary development vumat routine for three-dimensional beam element constitutive model, using the Kent-Park compressive stress-strain curve of the whole

ABAQUS UEL 用户自定义单元，可以采用Fortran语言编写用户程序，然后利用abaqus软件调用该程序，实现二次开发，可以输出结果到文件(SUBROUTINE UEL(RHS,AMATRX,SVARS,ENERGY,NDOFEL,NRHS,NSVARS, 1 PROPS,NPROPS,COORDS,MCRD,NNODE,U,DU,V,A,JTYPE,TIME,DTIME, 2 KSTEP,KINC,JELEM,PARAMS,NDLOAD,JDLTYP,ADLMA