Contact elements

I use contact element as MPC methods in ansys but I meet problem maybe because the target surface isn't shape-flat.

my project is modelling crack growth in weld fillet on tubular joint,  I have plan to modelling brace and chord with shell element and for weld metal with solid element ...

this my listing model in ansys 

!Subrotine

q=0.0005 !change with crack depth

w=q+0.0005

e=0.0005



/filname,Tugas Akhir Eko,0,off 

/title,Fracture on mismatching welded tubular joint

/prep7

/units,si



mp,ex,1,2E11                !Material properties (base)

mp,prxy,1,0.26                 

mp,dens,1,7850

tb,biso,1

tbdata,1,2.5e8,2e7



mp,ex,2,2E11                !Material properties (weld)

mp,prxy,2,0.26                 

mp,dens,2,7850

tb,biso,2

tbdata,1,2.5e8,2e7



et,1,186,,,1                    !Elements selection                

et,2,181

et,3,170

et,4,175

           

keyopt,2,1,0                    !Keyoptions setting

keyopt,3,5,3

keyopt,4,2,2

keyopt,4,12,5



r,1,0.1128                !Real constant setting

r,2,,,,,,-300



!----------(weld)            !Tubular joint modelling  

cylind,0.19172,0.203,-2.065,2.065,0,90

wprota,,-45

cylind,0.07556,0.07,0,2.2402,-90,90

csys,4

agen,2,3,,,,,0.015

vsba,2,13

vdele,4,,,1

vsba,1,15

vdele,2,,,1

vsba,3,20

vdele,1,,,1

cylind,0.0872,0.091,0,1,-90,90

vsba,4,7

vdele,5,,,1

vdele,1,,,1

vglue,2,3

l,24,27

l,21,28

al,2,3,41

al,1,4,39

al,4,36,44,3

va,4,7,8,9,23

vglue,1,2,4



!----------(brace)

cylind,0.07,0.07278,0,2.2482,-90,90

vsba,1,18

vdele,2,,,1

vdele,4

adele,28,30,,1

adele,2,26,26-2,1



!----------(chord)

wprota,,45

cylind,0.19172,0.19736,-2.065,2.065,-90,90

vsba,1,17

vsba,2,15

vdele,4

vdele,7,,,1

vdele,1

adele,3,31,31-3,1

adele,19,,,1

adele,24,28,2,1

adele,1,2,,1

adele,9,29,29-9,1



kl,3,.5                    !Surface crack modelling

kwpave,2

kwplan,,2,24,18

csys,wp

kgen,2,2,,,0.001

kgen,2,2,,,-0.001

kgen,2,2,,,,,0.005

kgen,2,2,,,,w

kgen,2,12,,,,w

lstr,3,11

lstr,11,12

lstr,3,12

lstr,12,32

lstr,31,32

larc,3,31,2,w

larc,11,31,2,w

al,5,13,14

al,5,6,7

al,6,14,12,11

al,7,13,12,11

va,1,2,3,9

vgen,2,1,,,,-e,,,,1

vovlap,1,3,5,6

vdele,2,4,2,1

Thanks U so much if you can help me   

Go on my email: ekolossal [at] gmail.com