1!
2!     CalculiX - A 3-dimensional finite element program
3!              Copyright (C) 1998-2021 Guido Dhondt
4!
5!     This program is free software; you can redistribute it and/or
6!     modify it under the terms of the GNU General Public License as
7!     published by the Free Software Foundation(version 2);
8!
9!
10!     This program is distributed in the hope that it will be useful,
11!     but WITHOUT ANY WARRANTY; without even the implied warranty of
12!     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13!     GNU General Public License for more details.
14!
15!     You should have received a copy of the GNU General Public License
16!     along with this program; if not, write to the Free Software
17!     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18!
19      subroutine uhardening(amat,iel,iint,t1l,epini,ep,dtime,fiso,dfiso,
20     &                      fkin,dfkin)
21!
22!     hardening user subroutine
23!
24!     INPUT:
25!
26!     amat:    material name (maximum 20 characters)
27!     iel:     element number
28!     iint:    integration point number
29!     t1l:     temperature at the end of the increment
30!     epini:   equivalent irreversible strain at the start
31!              of the increment
32!     ep:      present equivalent irreversible strain
33!     dtime:   time increment
34!
35!     OUTPUT:
36!
37!     fiso:    present isotropic hardening Von Mises stress
38!     dfiso:   present isotropic hardening tangent (derivative
39!              of the Von Mises stress with respect to the
40!              equivalent irreversible strain)
41!     fkin:    present kinematic hardening Von Mises stress
42!     dfkin:   present kinematic hardening tangent (derivative
43!              of the Von Mises stress with respect to the
44!              equivalent irreversible strain)
45!
46      implicit none
47!
48      character*80 amat
49      integer iel,iint
50      real*8 t1l,epini,ep,dtime,fiso,dfiso,fkin,dfkin
51!
52      return
53      end
54