FRP contact between to two solid surface (sandwich)

[hexa2016]

Hi,

I need to create contact between frp (shell element) and two solid surface (sandwich).

so i created an area between the solid surface (exactly at the mid loc between solid surfaces).....

number 1 and 2 represents contact at lower and upper of frp plates.

the script for both contacts are;

contact no 1;

!CONTACT SURFACE BETWEEN AREA 14 AND 73

R,4					!DEFINES THE ELEMENT REAL CONSTANTS NO 4
REAL,4				!SET THE ELEMENT REAL CONSTANT 4

!GENERATE TARGET SURFACE

ET,5,170	        !TARGE170 ELEMENT NO 5
ASEL,S,AREA,,14 	!RUBBER LAYER SURFACE
CM,TARGET,AREA
NSLA,S,1
ESLN,S,0
TYPE,5
ESURF

  
!GENERATE CONTACT SURFACE

ALLSEL 
ET,6,174            !CONTA174 ELEMENT  NO 6
KEYOPT,6,2,2        !CONTACT ALGORITHM-MPC APPROACH 
KEYOPT,6,4,2        !LOCATION OF DETECTION POINT -ON NODAL POINT NORMAL FROM CONTACT SURFACE-RIGID SURFACE CONSTRAINT 
KEYOPT,6,9,1		!Exclude both initial geometrical penetration or gap and offset
KEYOPT,6,11,1		!THICKNESS EFFECT : INCLUDED
KEYOPT,6,12,5       !BEHAVIOUR CONTACT SURFACE - BONDED ALWAYS 
ASEL,S,AREA,,73		!FRP SURFACE
CM,CONTACT,AREA		
NSLA,S,1			!SELECTS THE NODES ATTACHED TO THE AREA
ESLN,S,0			!SELECTS THOSE ELEMENTS ATTACHED TO THE SELECTED NODES
TYPE,6
ESURF

ALLSEL

contact no 2;

!CONTACT SURFACE BETWEEN AREA 19 AND 73

R,5				!DEFINES THE ELEMENT REAL CONSTANTS NO 5
REAL,5				!SET THE ELEMENT REAL CONSTANT 5

!GENERATE TARGET SURFACE

ET,7,170	        !TARGE170 ELEMENT NO 7
ASEL,S,AREA,,19 	!RUBBER LAYER SURFACE
CM,TARGET,AREA
NSLA,S,1
ESLN,S,0
TYPE,7
ESURF

  
!GENERATE CONTACT SURFACE

ALLSEL 
ET,8,174            !CONTA174 ELEMENT  NO 8
KEYOPT,8,2,2        !CONTACT ALGORITHM-MPC APPROACH 
KEYOPT,8,4,2        !LOCATION OF DETECTION POINT -ON NODAL POINT NORMAL FROM CONTACT SURFACE-RIGID SURFACE CONSTRAINT 
KEYOPT,8,9,1		!Exclude both initial geometrical penetration or gap and offset
KEYOPT,8,11,1		!THICKNESS EFFECT : INCLUDED
KEYOPT,8,12,5       !BEHAVIOUR CONTACT SURFACE - BONDED ALWAYS 
ASEL,S,AREA,,73		!FRP SURFACE
CM,CONTACT,AREA		
NSLA,S,1			!SELECTS THE NODES ATTACHED TO THE AREA
ESLN,S,0			!SELECTS THOSE ELEMENTS ATTACHED TO THE SELECTED NODES
TYPE,8
ESURF

ALLSEL

but i keep receiving warning message;

*** WARNING *** CP = 1013.047 TIME= 16:12:00
The geometric gap/penetration may be too large. Increase pinball
radius if it is a true geometric gap/penetration. Decrease pinball if
it is a false one.
****************************************

the gap between 2 solid surfaces is 1.2mm (exactly the size of frp final thickness

how to solve this problem?

thanks