equist
C EQUIST SOURCE CB215821 17/07/21 21:15:08 9513 c--------------------------------------------------------------------- c c c===================================================================== c = c This subroutine computes the equivalent strain in the eigen = c system. ----- = c ------ = c = c Variables: = c = c stres (3) desired part of stress tensor = c tangb tang(beta) (Drucker-Prager) = c young E = c equiv equivalent strain = c = c iflag: -1 - compression = c +1 - tension = c = c Author: Rui Faria Version: 93.04.20 = c -------- = c===================================================================== IMPLICIT INTEGER(I-N) integer iflag real*8 equiv, tangb, young, stres (3) c real*8 oneth, root3, octno, octsh, argum c parameter (oneth = 0.33333333333333 d0, . root3 = 1.73205080756888 d0) c if (iflag .eq. -1) then octno = (stres (1) + stres (2) + stres (3)) * oneth c octsh = SQRT ((stres (1) - stres (2))**2 + & (stres (2) - stres (3))**2 + & (stres (3) - stres (1))**2) * oneth argum = root3 * (octno * tangb + octsh) if (argum .gt. 0.0 d0) then equiv = SQRT (argum) else equiv = 0.0 d0 end if else c equiv = SQRT ((stres(1)**2+stres(2)**2+ . stres(3)**2) / young) endif c return end
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