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K value calculation in Ansys

Submitted by Gagandeep Singh on
education

I am trying to calculate K values for a double tip crack orientated at 45 deg in a rectangular plate in ansys.I am stuck with a strange problem. When i give the Kcal command it says the crack face is not parallel to the active x axis. But i have checked the cordinates of the keypoints that i have used to create the crack. The crack is perfectly symetric about the active cordinate system  about the crack tip.Can somebody help me please.

Siva P V Nadimpalli

Hi Gagan and Alam,

Some points to check are,

1) the positive direction of x-axis of cracktip coordinate system should be in the direction of crack growth. I assume that you have created a local coordinate system near the crack tip.  This is  different from global coordinate system.  And  while calculating K you need to make sure that the crack tip coordinate system is active.

2) also, try to check the way you have defined the "path"for K calculation.

I hope this helps.

 --Siva

Wed, 04/30/2008 - 15:46 Permalink