Hello,

I made a 2-D crack simulation for thermal barrier coating, but I didn't know the accuracy of my results. Could anyone help? I will list my major steps in the following. The crack is located in the middle of the model.

There are many 2-D Pre-Meshed Crack tutorial online, but none of them sets the crack in the middle. So it's hard for me to check the accuracy of my simulation results, especially the G (Strain Energy Release Rate) value I obtained for the case is not similar to the J-Integral value. 

1. Following is the 2-D model. The crack and the coordinate system is set as shown in picture.

2. Two ends of the crack are set as crack tips in "Pre-Meshed Crack"

3. Then I obtained results of J-Integral and G total:

G=10.158

J=4932.8

In the theory, these two values should be similar to each other. I made the simulation for side open crack also, which did have similar values of G and J. So I am so confused that why the crack in the middle will have such different results.

If you did similar research, please help me! I will do appropriate it.

Thanks,

Sylvia