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Modeling with line spring elements to find failure pressure of steam generator tube

Modeling with line spring elements to find failure pressure of steam generator tube

Modeling with line spring elements to find failure pressure of steam generator tube

(OP)
Hello, All
I am trying to model steam generator tube of length 110 , radius 11mm, thickness 1.27mm. It has 2 axial cracks of length 6.35mm. length between 2 cracks is 0.254mm.

As line spring elements cannot be created using Graphical user interface I first need input file. So I modelled the tube with shell elements S8R without any crack (once this model will run I will get input file and can modify it). As per paper which I am following the fracture coalescence pressure is 60Mpa means at this pressure J integral exceed the critical JIc.

**Material Property**
Material is Alloy 600.
Material property (Entered in ABAQUS): Elastic Modulus : 200 Gpa, Poission ratio : 0.3
Plastic property : Stress(MPa) Strain(mm/mm)
300 0
512 0.09274
687 0.178865
840 0.2582
946 0.33177
1125 0.5
1700 1.05
When I tried to run model WITHOUT CRACK (just simple cylindrical tube, length 55mm with end cap, quarter symmetry). At 30 MPa I didn’t get any warning. But at 60 Mpa I am getting warning that strain increment has exceeded 50 times the strain to cause first yield at xxxx points. Moreover I looked in job diagnostic so it shows that one node have numerical singularity.

What should I do to troubleshoot this warnings?

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