General Mechanical

General Mechanical

2D Crack Growth

    • Afrah
      Subscriber

      Hi everyone,


      I have attached some pictures of my model. Basically, I have a square specimen (dimensions 2000x2000 micrometer) with a hole (d = 120 micro) in the center. There is a crack (a=10 micro) located on the right of the hole. The material is glass ceramic, E = 91 GPA. 





      My goal is find the stress required to propagate the crack. Right now, however, the crack won't grow. I am using VCCT and my fracture criterion is the critical energy release rate (I have attached a picture). What am I doing wrong? 


       


       

    • Sandeep Medikonda
      Ansys Employee

      Afrah,


      That mesh is way too Coarse. Also please explain with a picture as to how you are loading this geometry?


      Here is a tutorial on VCCT from the help and here is another, which deals with a geometry similar to the one you are dealing with.


      P.S: Moved your question to the Structural Mechanics Category where it might get more traction.


      Regards,
      Sandeep

    • ammorey
      Subscriber

      you are looking for the stress required for the crack to grow ? have you checked another method ? j- integral as example ?


       

    • Afrah
      Subscriber

      Thank you for your response, I will refine the mesh and try again. 


       


      Here are my loading conditions:



       

    • Afrah
      Subscriber

      Thank you for your response. 


      Correct: I am looking for the stress for the crack to grow, but the results aren't the problem, the crack doesn't even to begin the propagate. 

    • ammorey
      Subscriber

      may be the load you have applied is quite less, have increased the load to check ? 

    • Afrah
      Subscriber

      Yeah, Ive increased the load to 1 GPa and the crack still doesnt grow.  I could increase it more, but even at lower loads the energy release rate is much greater than GIC. 

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