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XFEM crack propagation problem

XFEM crack propagation problem

XFEM crack propagation problem

(OP)
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 stress True Strain
7.286428615 0.024302293
8.170817233 0.028045138
9.291665364 0.032270163
11.95084605 0.041136892
12.54253357 0.043212398
13.2669284 0.045902121
13.60437563 0.047203275
14.14388116 0.049159352
15.67992206 0.055114318
15.82061944 0.055769926
16.58334339 0.058930722
16.95465539 0.060571782
18.0934607 0.065685889
18.87205955 0.069462235
19.27224339 0.071605596
19.866458 0.074718437
20.07558878 0.076023305
20.48771276 0.078337611
20.5528612 0.079080301
20.37500691 0.079245629
11.51636051 0.081778852

20.48771276 0.078337611
20.5528612 0.079080301
20.37500691 0.079245629
11.51636051 0.081778852
5.917319692 0.084634578
2.873524698 0.087665403
1.264605576 0.090892141
0.414909951 0.094311276
-0.046646599 0.097900124

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