192 lines
6.6 KiB
Text
192 lines
6.6 KiB
Text
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SUBROUTINE UEL(RHS,AMATRX,SVARS,ENERGY,NDOFEL,NRHS,NSVARS,
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1 PROPS,NPROPS,COORDS,MCRD,NNODE,U,DU,V,A,JTYPE,TIME,
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2 DTIME,KSTEP,KINC,JELEM,PARAMS,NDLOAD,JDLTYP,ADLMAG,
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3 PREDEF,NPREDF,LFLAGS,MLVARX,DDLMAG,MDLOAD,PNEWDT,
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4 JPROPS,NJPROP,PERIOD)
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C
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INCLUDE 'ABA_PARAM.INC'
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PARAMETER ( ZERO = 0.D0, HALF = 0.5D0, ONE = 1.D0 )
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C
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DIMENSION RHS(MLVARX,*),AMATRX(NDOFEL,NDOFEL),
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1 SVARS(NSVARS),ENERGY(8),PROPS(*),COORDS(MCRD,NNODE),
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2 U(NDOFEL),DU(MLVARX,*),V(NDOFEL),A(NDOFEL),TIME(2),
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3 PARAMS(3),JDLTYP(MDLOAD,*),ADLMAG(MDLOAD,*),
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4 DDLMAG(MDLOAD,*),PREDEF(2,NPREDF,NNODE),LFLAGS(*),
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5 JPROPS(*)
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DIMENSION SRESID(6)
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C
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C UEL SUBROUTINE FOR A HORIZONTAL TRUSS ELEMENT
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C
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C SRESID - stores the static residual at time t+dt
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C SVARS - In 1-6, contains the static residual at time t
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C upon entering the routine. SRESID is copied to
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C SVARS(1-6) after the dynamic residual has been
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C calculated.
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C - For half-increment residual calculations: In 7-12,
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C contains the static residual at the beginning
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C of the previous increment. SVARS(1-6) are copied
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C into SVARS(7-12) after the dynamic residual has
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C been calculated.
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C
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AREA = PROPS(1)
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E = PROPS(2)
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ANU = PROPS(3)
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RHO = PROPS(4)
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C
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ALEN = ABS(COORDS(1,2)-COORDS(1,1))
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AK = AREA*E/ALEN
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AM = HALF*AREA*RHO*ALEN
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C
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DO K1 = 1, NDOFEL
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SRESID(K1) = ZERO
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DO KRHS = 1, NRHS
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RHS(K1,KRHS) = ZERO
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END DO
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DO K2 = 1, NDOFEL
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AMATRX(K2,K1) = ZERO
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END DO
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END DO
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C
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IF (LFLAGS(3).EQ.1) THEN
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C Normal incrementation
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IF (LFLAGS(1).EQ.1 .OR. LFLAGS(1).EQ.2) THEN
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C *STATIC
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AMATRX(1,1) = AK
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AMATRX(4,4) = AK
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AMATRX(1,4) = -AK
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AMATRX(4,1) = -AK
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IF (LFLAGS(4).NE.0) THEN
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FORCE = AK*(U(4)-U(1))
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DFORCE = AK*(DU(4,1)-DU(1,1))
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SRESID(1) = -DFORCE
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SRESID(4) = DFORCE
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RHS(1,1) = RHS(1,1)-SRESID(1)
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RHS(4,1) = RHS(4,1)-SRESID(4)
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ENERGY(2) = HALF*FORCE*(DU(4,1)-DU(1,1))
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* + HALF*DFORCE*(U(4)-U(1))
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* + HALF*DFORCE*(DU(4,1)-DU(1,1))
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ELSE
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FORCE = AK*(U(4)-U(1))
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SRESID(1) = -FORCE
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SRESID(4) = FORCE
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RHS(1,1) = RHS(1,1)-SRESID(1)
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RHS(4,1) = RHS(4,1)-SRESID(4)
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DO KDLOAD = 1, NDLOAD
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IF (JDLTYP(KDLOAD,1).EQ.1001) THEN
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RHS(4,1) = RHS(4,1)+ADLMAG(KDLOAD,1)
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ENERGY(8) = ENERGY(8)+(ADLMAG(KDLOAD,1)
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* - HALF*DDLMAG(KDLOAD,1))*DU(4,1)
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IF (NRHS.EQ.2) THEN
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C Riks
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RHS(4,2) = RHS(4,2)+DDLMAG(KDLOAD,1)
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END IF
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END IF
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END DO
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ENERGY(2) = HALF*FORCE*(U(4)-U(1))
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END IF
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ELSE IF (LFLAGS(1).EQ.11 .OR. LFLAGS(1).EQ.12) THEN
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C *DYNAMIC
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ALPHA = PARAMS(1)
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BETA = PARAMS(2)
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GAMMA = PARAMS(3)
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C
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DADU = ONE/(BETA*DTIME**2)
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DVDU = GAMMA/(BETA*DTIME)
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C
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DO K1 = 1, NDOFEL
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AMATRX(K1,K1) = AM*DADU
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RHS(K1,1) = RHS(K1,1)-AM*A(K1)
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END DO
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AMATRX(1,1) = AMATRX(1,1)+(ONE+ALPHA)*AK
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AMATRX(4,4) = AMATRX(4,4)+(ONE+ALPHA)*AK
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AMATRX(1,4) = AMATRX(1,4)-(ONE+ALPHA)*AK
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AMATRX(4,1) = AMATRX(4,1)-(ONE+ALPHA)*AK
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FORCE = AK*(U(4)-U(1))
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SRESID(1) = -FORCE
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SRESID(4) = FORCE
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RHS(1,1) = RHS(1,1) -
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* ((ONE+ALPHA)*SRESID(1)-ALPHA*SVARS(1))
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RHS(4,1) = RHS(4,1) -
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* ((ONE+ALPHA)*SRESID(4)-ALPHA*SVARS(4))
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ENERGY(1) = ZERO
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DO K1 = 1, NDOFEL
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SVARS(K1+6) = SVARS(k1)
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SVARS(K1) = SRESID(K1)
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ENERGY(1) = ENERGY(1)+HALF*V(K1)*AM*V(K1)
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END DO
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ENERGY(2) = HALF*FORCE*(U(4)-U(1))
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END IF
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ELSE IF (LFLAGS(3).EQ.2) THEN
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C Stiffness matrix
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AMATRX(1,1) = AK
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AMATRX(4,4) = AK
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AMATRX(1,4) = -AK
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AMATRX(4,1) = -AK
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ELSE IF (LFLAGS(3).EQ.4) THEN
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C Mass matrix
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DO K1 = 1, NDOFEL
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AMATRX(K1,K1) = AM
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END DO
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ELSE IF (LFLAGS(3).EQ.5) THEN
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C Half-increment residual calculation
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ALPHA = PARAMS(1)
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FORCE = AK*(U(4)-U(1))
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SRESID(1) = -FORCE
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SRESID(4) = FORCE
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RHS(1,1) = RHS(1,1)-AM*A(1)-(ONE+ALPHA)*SRESID(1)
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* + HALF*ALPHA*( SVARS(1)+SVARS(7) )
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RHS(4,1) = RHS(4,1)-AM*A(4)-(ONE+ALPHA)*SRESID(4)
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* + HALF*ALPHA*( SVARS(4)+SVARS(10) )
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ELSE IF (LFLAGS(3).EQ.6) THEN
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C Initial acceleration calculation
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DO K1 = 1, NDOFEL
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AMATRX(K1,K1) = AM
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END DO
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FORCE = AK*(U(4)-U(1))
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SRESID(1) = -FORCE
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SRESID(4) = FORCE
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RHS(1,1) = RHS(1,1)-SRESID(1)
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RHS(4,1) = RHS(4,1)-SRESID(4)
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ENERGY(1) = ZERO
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DO K1 = 1, NDOFEL
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SVARS(K1) = SRESID(K1)
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ENERGY(1) = ENERGY(1)+HALF*V(K1)*AM*V(K1)
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END DO
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ENERGY(2) = HALF*FORCE*(U(4)-U(1))
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ELSE IF (LFLAGS(3).EQ.100) THEN
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C Output for perturbations
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IF (LFLAGS(1).EQ.1 .OR. LFLAGS(1).EQ.2) THEN
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C *STATIC
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FORCE = AK*(U(4)-U(1))
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DFORCE = AK*(DU(4,1)-DU(1,1))
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SRESID(1) = -DFORCE
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SRESID(4) = DFORCE
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RHS(1,1) = RHS(1,1)-SRESID(1)
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RHS(4,1) = RHS(4,1)-SRESID(4)
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ENERGY(2) = HALF*FORCE*(DU(4,1)-DU(1,1))
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* + HALF*DFORCE*(U(4)-U(1))
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* + HALF*DFORCE*(DU(4,1)-DU(1,1))
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DO KVAR = 1, NSVARS
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SVARS(KVAR) = ZERO
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END DO
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SVARS(1) = RHS(1,1)
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SVARS(4) = RHS(4,1)
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ELSE IF (LFLAGS(1).EQ.41) THEN
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C *FREQUENCY
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DO KRHS = 1, NRHS
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DFORCE = AK*(DU(4,KRHS)-DU(1,KRHS))
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SRESID(1) = -DFORCE
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SRESID(4) = DFORCE
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RHS(1,KRHS) = RHS(1,KRHS)-SRESID(1)
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RHS(4,KRHS) = RHS(4,KRHS)-SRESID(4)
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END DO
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DO KVAR = 1, NSVARS
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SVARS(KVAR) = ZERO
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END DO
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SVARS(1) = RHS(1,1)
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SVARS(4) = RHS(4,1)
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END IF
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END IF
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C
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RETURN
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END
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