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105 lines
3.8 KiB
105 lines
3.8 KiB
C Copyright(C) 1999-2020 National Technology & Engineering Solutions
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C of Sandia, LLC (NTESS). Under the terms of Contract DE-NA0003525 with
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C NTESS, the U.S. Government retains certain rights in this software.
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C
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C See packages/seacas/LICENSE for details
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C=======================================================================
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SUBROUTINE PXN2 (RETMIN, PARTYP, LENARY, NELBLK, IXELB, ISEVOK,
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& NUMIX, IXNODE, IXELEM, SIG11, SIG22, SIG12, RESULT)
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C=======================================================================
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C --*** PXN2 *** (ALGEBRA) Calculate 2x2 principal values
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C -- Written by Amy Gilkey - revised 05/17/88
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C --
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C --PXN2 determines minimum or maximum principal values for a 2 by 2
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C --array.
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C --
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C --Parameters:
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C -- RETMIN - IN - true iff minimum versus maximum to be calculated
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C -- PARTYP - IN - the parameter type (element must be handled differently)
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C -- LENARY - IN - the length of the parameter arrays
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C -- NELBLK - IN - the number of element blocks
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C -- IXELB - IN - the cumulative element counts for each element block
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C -- ISEVOK - IN - the element variable truth table for each element block
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C -- NUMIX - IN - the number of selected values; <0 if all
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C -- IXNODE - IN - the indices of the selected nodes (only if NUMIX >= 0)
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C -- IXELEM - IN - the indices of the selected elements (only if NUMIX >= 0)
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C -- SIG11, SIG22, SIG12 - IN - the tensor components
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C -- RESULT - OUT - the returned principal values
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LOGICAL RETMIN
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CHARACTER PARTYP
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INTEGER IXELB(0:NELBLK)
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LOGICAL ISEVOK(*)
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INTEGER IXNODE(*)
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INTEGER IXELEM(*)
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REAL SIG11(*), SIG22(*), SIG12(*)
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REAL RESULT(*)
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IF (NUMIX .GE. 0) THEN
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IF (PARTYP .NE. 'E') THEN
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DO 100 I = 1, NUMIX
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J = IXNODE(I)
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SROOT = SQRT
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& ((0.5 * (SIG11(J)-SIG22(J)))**2 + SIG12(J)**2)
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IF (RETMIN) THEN
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RESULT(J) = 0.5 * (SIG11(J)+SIG22(J)) - SROOT
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ELSE
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RESULT(J) = 0.5 * (SIG11(J)+SIG22(J)) + SROOT
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END IF
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100 CONTINUE
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ELSE
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DO 120 IELB = 1, NELBLK
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IF (ISEVOK(IELB)) THEN
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DO 110 I = IXELB(IELB-1)+1, IXELB(IELB)
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J = IXELEM(I)
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SROOT = SQRT
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& ((0.5 * (SIG11(J)-SIG22(J)))**2 + SIG12(J)**2)
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IF (RETMIN) THEN
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RESULT(J) = 0.5 * (SIG11(J)+SIG22(J)) - SROOT
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ELSE
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RESULT(J) = 0.5 * (SIG11(J)+SIG22(J)) + SROOT
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END IF
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110 CONTINUE
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END IF
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120 CONTINUE
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END IF
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ELSE
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C NUMIX < 0; ALL VALUES SELECTED
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C NUMEL=NUMELO; NUMNP=NUMNPO; IXELB(J)=IXELBO(J), J=1,NELBLK
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IF (PARTYP .NE. 'E') THEN
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DO 130 J = 1, LENARY
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SROOT = SQRT
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& ((0.5 * (SIG11(J)-SIG22(J)))**2 + SIG12(J)**2)
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IF (RETMIN) THEN
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RESULT(J) = 0.5 * (SIG11(J)+SIG22(J)) - SROOT
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ELSE
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RESULT(J) = 0.5 * (SIG11(J)+SIG22(J)) + SROOT
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END IF
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130 CONTINUE
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ELSE
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DO 150 IELB = 1, NELBLK
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IF (ISEVOK(IELB)) THEN
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DO 140 J = IXELB(IELB-1)+1, IXELB(IELB)
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SROOT = SQRT
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& ((0.5 * (SIG11(J)-SIG22(J)))**2 + SIG12(J)**2)
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IF (RETMIN) THEN
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RESULT(J) = 0.5 * (SIG11(J)+SIG22(J)) - SROOT
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ELSE
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RESULT(J) = 0.5 * (SIG11(J)+SIG22(J)) + SROOT
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END IF
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140 CONTINUE
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END IF
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150 CONTINUE
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END IF
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END IF
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RETURN
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END
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