Dear friend:
As known to all, the magnitude of the stress/strain at the crack tip is mathematically infinite,while it is physically finite. So,what i am concerned is how to caculate the value of the stress/strain at the tip.What's more, i doubt that whether the CTOD is constant during the propogation process.if yes.so can i take a constant range of the limited stress/strain near the crack tip? If there is any reply ,i will be appreciated!
Yours Sincerely