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ABAQUS 3D model not initiating crack

ABAQUS 3D model not initiating crack

ABAQUS 3D model not initiating crack

(OP)
Hello
Properties
Outside cuboid, bigger ellipsoid one: E=3.24 GPa, =0.3
G1c, G2c, G3c=2870 N/m
Maxps= 22MPa (maximum principal stress)
Inside Ellipsoid (smaller one): E=0.81 GPa,=0.075

Outside is the cuboid, inside is two ellipses (the bigger has some property with the out cuboid, it is only for enrichment area where the crack should propagate), the smaller ellipse has different material properties than rest of two.
Model:


Prestress and BCS


Results

So when I release the prestress crack is not forming, can you please let me know why.
I will be grateful.

With regards
Biswabhanu Puhan

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