C Rutina 101
C-----------------------------------------------------------EQUIL_DEB---
C     															   
C     SUBRUTINA EQUIL_DEB
C     
C     MONTAJE DE LAS ECUACIONES DE EQUILIBRIO EN FORMA DEBIL
C	CORRESPONDIENTES A UN FRAMENTO DE LA ZONA DE CONTACTO
C
C	CONTACTO DEBIL	
C
	SUBROUTINE EQUIL_DEB(PRB,ELTA,ELTB,NOD,x1A,x2A,x1B,x2B,
	@						  alfa,SAij,SFi,ceq)
C
      IMPLICIT NONE
C
      INCLUDE '_param.for'
      INCLUDE '_struct.for'
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C     VARIABLES EXTERNAS
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C
C PRB : Variables globales del problema
      RECORD /S_problema/ PRB
C ELTA,ELTB : Elemento de los solidos A y B corresp. al fragmento
	RECORD /S_elemento/ ELTA,ELTB
C NOD : Nodos del problema
      RECORD /S_nodo/ NOD(N_MAX_NOD)
C x1A,x2A,x1B,x2B : Posicion local de comienzo y fin de la integracion
C                   en cada fragemento de la zona de contacto
	REAL*8 x1A,x2A,x1B,x2B
C ALFA : Indice de la funcion de forma de la tension virtual
	INTEGER ALFA
C SAIJ(,) : Matriz del sistema.
      REAL*8 SAij(N_MAX_INC,N_MAX_INC)
C SFi() : Termino independiente.
      REAL*8 SFi(N_MAX_INC)
C CEQ : Contador de ecuacuones de contacto
      INTEGER CEQ
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C     VARIABLES INTERNAS
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C
C I,J,K,M : Contador
      INTEGER J,K,M
C Contador
      INTEGER CINC
C n1B,n2B : Nodos extremos de ELTB
	INTEGER n1B,n2B
C LB: Longitud de ELTA 
	REAL*8 LB
C Ho*H(,) : Matriz de Integrales de las funciones de forma
	REAL*8 Ho,H(2,6)
C FFA1,FFA2,FFB1,FFB2 : Valor de las funciones de forma en x1A,x2A,x1B,x2B
	REAL*8 FFA1(2),FFA2(2),FFB1(2),FFB2(2)
C nA,nB : Normales a ELTA y ELTB
	REAL*8 nA(2),nB(2)
C CORDENADA r EN EL ORIGEN Y EL EXTREMO DE LOS ELEMENTOS (Probl. Axisim)
	REAL*8 Y1r,Y2r
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C     VALORES INICIALES
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C
	n1B=ELTB.NI(1)
	n2B=ELTB.NI(2)
C
	LB=(x2B-x1B)*DSQRT((NOD(n2B).XYZ(1)-NOD(n1B).XYZ(1))**2.d0+
	@         (NOD(n2B).XYZ(2)-NOD(n1B).XYZ(2))**2.d0)/2.d0
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C     ECUACIONES DE EQULIBRIO
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C     
	CALL FUNC_FORM(x1A,FFA1,1)
	CALL FUNC_FORM(x2A,FFA2,1)
	CALL FUNC_FORM(x1B,FFB1,1)
	CALL FUNC_FORM(x2B,FFB2,1)
C
	Y1r=FFB1(1)*NOD(n1B).XYZ(1)+FFB1(2)*NOD(n2B).XYZ(1)
	Y2r=FFB2(1)*NOD(n1B).XYZ(1)+FFB2(2)*NOD(n2B).XYZ(1)
C
	CALL NOR_ELT(nB,ELTB,NOD)
	nA(1)=-nB(1)
	nA(2)=-nB(2)
C
C	SOLIDO A
C
C	Primer nodo
C
	SELECT CASE(PRB.TP.TIP)	
	  CASE(21,22,31,32,51,52)
C	  PROBLEMA PLANO
		Ho=( FFB2(alfa)*(2.d0*FFA1(1)+FFA2(1))+
	@	     FFB1(alfa)*(FFA1(1)+2.d0*FFA2(1)) )*LB/6.d0
	  CASE(1)
C	  PROBLEMA AXISIMETRICO
		Ho=( FFB2(alfa)*((3.d0*Y1r+Y2r)*FFA1(1)+(Y1r+Y2r)*FFA2(1))+
	@	     FFB1(alfa)*((Y1r+Y2r)*FFA1(1)+(Y1r+3.d0*Y2r)*FFA2(1)) )
	@	     *LB/12.d0
	  CASE DEFAULT
	    WRITE(F_W,10500) 1
	    WRITE( *,10500) 1 
		STOP
      END SELECT
C
	H(1,5)= nA(1)*Ho
	H(1,6)= nA(2)*Ho
	H(2,5)=-nA(2)*Ho
	H(2,6)= nA(1)*Ho
C	Terminos que afectan a la matriz del sistema
	DO j=1,NOD(ELTA.NI(1)).NINC
	  cinc=NOD(ELTA.NI(1)).INC(j)
	  DO m=5,6
		SAij(ceq,cinc)  =SAij(ceq,cinc)+
	@                     H(1,m)*NOD(ELTA.NI(1)).Gij(m,j)
		SAij(ceq+1,cinc)=SAij(ceq+1,cinc)+
	@                     H(2,m)*NOD(ELTA.NI(1)).Gij(m,j)
	  END DO
	ENDDO
C	Terminos que afectan al vector de carga
	DO j=1,NOD(ELTA.NI(1)).NBC
	  k=j+NOD(ELTA.NI(1)).NINC
	  DO m=5,6
		SFi(ceq)  =SFi(ceq)  -H(1,m)*NOD(ELTA.NI(1)).Gij(m,k)*
	@                     NOD(ELTA.NI(1)).VBC(j)
		SFi(ceq+1)=SFi(ceq+1)-H(2,m)*NOD(ELTA.NI(1)).Gij(m,k)*
	@                     NOD(ELTA.NI(1)).VBC(j)
	  END DO
	ENDDO
C
C	Segundo nodo
C
	SELECT CASE(PRB.TP.TIP)	
	  CASE(21,22,31,32,51,52)
C	  PROBLEMA PLANO
		Ho=( FFB2(alfa)*(2.d0*FFA1(2)+FFA2(2))+
	@	     FFB1(alfa)*(FFA1(2)+2.d0*FFA2(2)) )*LB/6.d0
	  CASE(1)
C	  PROBLEMA AXISIMETRICO
		Ho=( FFB2(alfa)*((3.d0*Y1r+Y2r)*FFA1(2)+(Y1r+Y2r)*FFA2(2))+
	@	     FFB1(alfa)*((Y1r+Y2r)*FFA1(2)+(Y1r+3.d0*Y2r)*FFA2(2)) )
	@	     *LB/12.d0
	  CASE DEFAULT
	    WRITE(F_W,10500) 1
	    WRITE( *,10500) 1 
		STOP
      END SELECT
C
	H(1,3)= nA(1)*Ho
	H(1,4)= nA(2)*Ho
	H(2,3)=-nA(2)*Ho
	H(2,4)= nA(1)*Ho
C	Terminos que afectan a la matriz del sistema
	DO j=1,NOD(ELTA.NI(2)).NINC
	  cinc=NOD(ELTA.NI(2)).INC(j)
	  DO m=3,4
		SAij(ceq,cinc)  =SAij(ceq,cinc)+
	@                     H(1,m)*NOD(ELTA.NI(2)).Gij(m,j)
		SAij(ceq+1,cinc)=SAij(ceq+1,cinc)+
	@                     H(2,m)*NOD(ELTA.NI(2)).Gij(m,j)
	  END DO
	ENDDO
C	Terminos que afectan al vector de carga
	DO j=1,NOD(ELTA.NI(2)).NBC
	  k=j+NOD(ELTA.NI(2)).NINC
	  DO m=3,4
		SFi(ceq)  =SFi(ceq)  -H(1,m)*NOD(ELTA.NI(2)).Gij(m,k)*
	@                     NOD(ELTA.NI(2)).VBC(j)
		SFi(ceq+1)=SFi(ceq+1)-H(2,m)*NOD(ELTA.NI(2)).Gij(m,k)*
	@                     NOD(ELTA.NI(2)).VBC(j)
	  END DO
	ENDDO
C
C	SOLIDO B
C
C	Primer nodo
C
	SELECT CASE(PRB.TP.TIP)	
	  CASE(21,22,31,32,51,52)
C	  PROBLEMA PLANO
		Ho=( FFB2(alfa)*(2.d0*FFB2(1)+FFB1(1))+
	@	     FFB1(alfa)*(FFB2(1)+2.d0*FFB1(1)) )*LB/6.d0
	  CASE(1)
C	  PROBLEMA AXISIMETRICO
		Ho=( FFB2(alfa)*((3.d0*Y1r+Y2r)*FFB2(1)+(Y1r+Y2r)*FFB1(1))+
	@	     FFB1(alfa)*((Y1r+Y2r)*FFB2(1)+(Y1r+3.d0*Y2r)*FFB1(1)) )
	@	     *LB/12.d0
	  CASE DEFAULT
	    WRITE(F_W,10500) 1
	    WRITE( *,10500) 1 
		STOP
      END SELECT
C
	H(1,5)= nB(1)*Ho
	H(1,6)= nB(2)*Ho
	H(2,5)=-nB(2)*Ho
	H(2,6)= nB(1)*Ho
C	Terminos que afectan a la matriz del sistema
	DO j=1,NOD(ELTB.NI(1)).NINC
	  cinc=NOD(ELTB.NI(1)).INC(j)
	  DO m=5,6
		SAij(ceq,cinc)  =SAij(ceq,cinc)+
	@                     H(1,m)*NOD(ELTB.NI(1)).Gij(m,j)
		SAij(ceq+1,cinc)=SAij(ceq+1,cinc)+
	@                     H(2,m)*NOD(ELTB.NI(1)).Gij(m,j)
	  END DO
	ENDDO
C	Terminos que afectan al vector de carga
	DO j=1,NOD(ELTB.NI(1)).NBC
	  k=j+NOD(ELTB.NI(1)).NINC
	  DO m=5,6
		SFi(ceq)  =SFi(ceq)  -H(1,m)*NOD(ELTB.NI(1)).Gij(m,k)*
	@                     NOD(ELTB.NI(1)).VBC(j)
		SFi(ceq+1)=SFi(ceq+1)-H(2,m)*NOD(ELTB.NI(1)).Gij(m,k)*
	@                     NOD(ELTB.NI(1)).VBC(j)
	  END DO
	ENDDO
C
C	Segundo nodo
C
	SELECT CASE(PRB.TP.TIP)	
	  CASE(21,22,31,32,51,52)
C	  PROBLEMA PLANO
		Ho=( FFB2(alfa)*(2.d0*FFB2(2)+FFB1(2))+
	@	     FFB1(alfa)*(FFB2(2)+2.d0*FFB1(2)) )*LB/6.d0
	  CASE(1)
C	  PROBLEMA AXISIMETRICO
		Ho=( FFB2(alfa)*((3.d0*Y1r+Y2r)*FFB2(2)+(Y1r+Y2r)*FFB1(2))+
	@	     FFB1(alfa)*((Y1r+Y2r)*FFB2(2)+(Y1r+3.d0*Y2r)*FFB1(2)) )
	@	     *LB/12.d0
	  CASE DEFAULT
	    WRITE(F_W,10500) 1
	    WRITE( *,10500) 1 
		STOP
      END SELECT
C
	H(1,3)= nB(1)*Ho
	H(1,4)= nB(2)*Ho
	H(2,3)=-nB(2)*Ho
	H(2,4)= nB(1)*Ho
C	Terminos que afectan a la matriz del sistema
	DO j=1,NOD(ELTB.NI(2)).NINC
	  cinc=NOD(ELTB.NI(2)).INC(j)
	  DO m=3,4
		SAij(ceq,cinc)  =SAij(ceq,cinc)+
	@                     H(1,m)*NOD(ELTB.NI(2)).Gij(m,j)
		SAij(ceq+1,cinc)=SAij(ceq+1,cinc)+
	@                     H(2,m)*NOD(ELTB.NI(2)).Gij(m,j)
	  END DO
	ENDDO
C	Terminos que afectan al vector de carga
	DO j=1,NOD(ELTB.NI(2)).NBC
	  k=j+NOD(ELTB.NI(2)).NINC
	  DO m=3,4
		SFi(ceq)  =SFi(ceq)  -H(1,m)*NOD(ELTB.NI(2)).Gij(m,k)*
	@                     NOD(ELTB.NI(2)).VBC(j)
		SFi(ceq+1)=SFi(ceq+1)-H(2,m)*NOD(ELTB.NI(2)).Gij(m,k)*
	@                     NOD(ELTB.NI(2)).VBC(j)
	  END DO
	ENDDO
C
C     FIN DE LA RUTINA 
C        
      RETURN
C
C     FORMATOS DE ESCRITURA. 
C                  
10500 FORMAT(/,2x,'ERROR 10500 - EQUIL_DEB - Error Programa (#',
     @       i1,'#)')
C
      END
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