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how to get the directions of principal stress

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I just want to know how could I get the direction or angle of principal stress, as it show in the tensor plot. I have been struggling with this problem since yesterday, but I didn't get anything.

Thank you for you time..so..much..

Any advice will be appreciated.

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hi, @Q.Nguyen-Dai

Thank you so much for you reply.

I am so sorry for I didn't express my question clearly.

As your screenshot shows, different element have principal stress with different direction. I just want to get the direction/angle in numerical. Then I can calculate something based on this direction. I don't know if I have right expressed what I want to get. I want to a direction in numerical, such as l=(0,0,1) which means the major principal stress direction of one element parallel with Z-axis. Then the l=(0,0,1) is what I want to get.

best wishes


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