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abaqus - ball indentation- high value of stress
I have modeled a cyclic ball indentation problem in
Abaqus. The sphere has been modeled as axisymmetric rigid surface while
the plate is axisymmetric deformable. The material data fed in for the
plate has been obtained from low cycle fatigue experiments and the
combined hardening model using half-cycle has beem employed.
Apart from this, the loading is displacement-controlled and sphere
is the master surface while the plate is slave surface. The other
parameters used are: surface to surface contact, small sliding, "Hard"
contact and friction coefficient as 0.2.
The meshing is done as is done is various published papers.
PROBLEM: I am getting Stress values (in the vertical direction: S22) as
very high. I am getting values as high as 1600 MPa underneath the
indenter, when the UTS of the material is only 540 MPa.
What could be the reason for this?
It would be kind of you to reply to me as soon as possible.