Convergence Problem using Biphasic Material to model hip joint in Abaqus

Dear All,

i am new to this forum and would like say hello to everybody!

I am currently working on a hip joint model consistent mainly
of the cartilogenous tissues. Biphasic Materials consitent of
a linear elastic Matrix and trapped fluid, which i modelled in
abaqus using Soil Mechanics (permeability).

At the moment, however, i am unable to obtain convergence. The
whole calculation stops at ca 0.122 sec out of total 1 sec. I
guess its just one parameter set wrong in Contact or an convergence

criteria! Would be very thankful for any help.

[Material is validated against Literiture first modeled as a plug,
Elements are C3D20RP, unsymetric solver is used due to curvedcontact surfaces and biphasic material.]

http://files.engineering.com/getfile.aspx?folder=a4044fd5-1af5-4e8a-9db2-fce39966e57e&file=Model.zip 

Cheers
Felix