I meet a problem for very long surface crack (a/c<0.1)

[yxh992003]

Dear Sir/Madam,

I am doing fracture mechanics analysis of inner pressured Ti tubes.

I have finished the work for the traditional surface crack,
including the calculation of J-integral and K of the tube, and the
crack propagation life prediction. All results are satisfactory.

However, I meet a problem for the very long crack, i.e. the ratio of
crack depth to crack length is very small, a/c=0.02, 0.01, 0.005,
the FE result shows that the J-integral along the crack tip is not a
constant value anymore.

Could you please tell me or give me some literature how to do the
crack propagation for the very long crack when the J-integral is not
a constant along the crack tip?

Thank you very much and best regards

[sachin bm]

You can simulate crack propagation using zencrack software. which uses abaqus as the solver. following is the web address

http://www.zentech.co.uk/


with best regards
Sachin BM




----- Original Message ----
From: yxh992003 <***@yahoo.com>
To: ***@yahoogroups.com
Sent: Wednesday, January 31, 2007 4:15:26 AM
Subject: [ABAQUS] I meet a problem for very long surface crack (a/c<0.1)

Dear Sir/Madam,

I am doing fracture mechanics analysis of inner pressured Ti tubes.

I have finished the work for the traditional surface crack,
including the calculation of J-integral and K of the tube, and the
crack propagation life prediction. All results are satisfactory.

However, I meet a problem for the very long crack, i.e. the ratio of
crack depth to crack length is very small, a/c=0.02, 0.01, 0.005,
the FE result shows that the J-integral along the crack tip is not a
constant value anymore.

Could you please tell me or give me some literature how to do the
crack propagation for the very long crack when the J-integral is not
a constant along the crack tip?

Thank you very much and best regards






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