PERFECTLY_PLASTIC.f90

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!    Copyright (C) 2012 The SPEED FOUNDATION
!    Author: Ilario Mazzieri
!
!    This file is part of SPEED.
!
!    SPEED is free software; you can redistribute it and/or modify it
!    under the terms of the GNU Affero General Public License as
!    published by the Free Software Foundation, either version 3 of the
!    License, or (at your option) any later version.
!
!    SPEED is distributed in the hope that it will be useful, but
!    WITHOUT ANY WARRANTY; without even the implied warranty of
!    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
!    Affero General Public License for more details.
!
!    You should have received a copy of the GNU Affero General Public License
!    along with SPEED.  If not, see <http://www.gnu.org/licenses/>.
 
!---------------------Elastic - Perfecty Plastic---------------------------
 
subroutine perfectly_plastic(E0, s, de, fy)
 
        implicit none
 
        real*8 :: e0, de, s, s0, fy, temp
 
        s0 = s
  if (s0.ge.-fy .and. s0.le.fy) then
    temp = s0 + e0 * de
    if ((temp.ge.-fy).and.(temp.le.fy)) then
      s = temp
    elseif (temp.lt.-fy) then
      s = -fy
    elseif (temp.gt.fy) then
      s = fy
    endif
  endif
 
        return
end subroutine perfectly_plastic