Crack propagation using XFEM

Hi all,

I have my material properties from a tensile test as shown in this table: (it's the plastic part + damaged part)

I have created my model in 3D and it's a bone shape. the material properties in Abaqus is defined as elastic part : E=290 , 0.45 for Poisson Ratio- and for plastic part I have used the table up to 20.55Mpa stress. and then Damage: Maxps =20.5 and damage evolution : Displacement --->Tabular

I calculated D and displacement.

after running the program, it starts the cracking and it propagate, but the problem is that 1- it does not separate(as I assigned displacement load, so it should be able to converge) and 2- the stress strain curve after propagation is not the same as the one from lab tests.

would you please guide me about these two questions?

True stressTrue Strain
7.2864286150.0243023
8.1708172330.0280451
9.2916653640.0322702
11.950846050.0411369
12.542533570.0432124
13.26692840.0459021
13.604375630.0472033
14.143881160.0491594
15.679922060.0551143
15.820619440.0557699
16.583343390.0589307
16.954655390.0605718
18.09346070.0656859
18.872059550.0694622
19.272243390.0716056
19.8664580.0747184
20.075588780.0760233
20.487712760.0783376
20.55286120.0790803
20.375006910.0792456
11.516360510.0817789
5.9173196920.0846346
2.8735246980.0876654
1.2646055760.0908921
0.4149099510.0943113
-0.04664660.0979001