Chen Long's blog

dear my friends:

 I am a new one in the fatigue crack study. as we all konw, there is a crack resistant near the crack tip before its cracking. HRR model has been well testfied in monotanic crack, so i wonder whether it can be expanded to the cyclic crack situation or not! if yes, so how to describe the stress-strain distribution just nearby the tip? can we define a similar resistant value in the cyclic status?and is the stress redistribution concept right for the stress harden material?

any suggestions would be appreciated!

regards, Long

Dear My friends:

hi!

i am interested in the fatigue crack growth of a cracked body.Recently,i am stucked by a problem of how is the stree-strain relationship near the crack tip  under cyclic loading.As we know,the HRR field near a crack tip under monotanic loading is well solved.So,i doublt that if the type of the HRR formulation can still be used under cyclic loading.If not,why?And how to solve this problem?if there is any suggestions or references ,i would be appreciated!