CT specimen and crack analysis

Hi! I'm working on a project and I have to analyze a compact tension specimen with a crack. I tried different meshes but they all have the same problem: all the stresses are confined in the first element around the crack tip, thus I cannot see properly the stresses on the component. Furthermore, the crack tip has both maximum and minimum stresses. How can I solve this problem?

Thank you. 

Martina 








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