The Paris equation

raulito — Thu, 12 Jun 2008 10:58:25 -0400

The Paris equation should correctly be referred to as the ERDOGAN-PARIS equation, maybe some more names may be needed.

LEFM is a term bandied about in the text books, but very few texts know how to define what it means and how it applies.

You can take my course. What happened to the earlier posts about my course.

Anyone who contributes to my DORN-RAJNAK or HARPER DORN will be given credit.

John Dorn explained to me when I met him at Berkeley ( a while back), that the purpose of his dislocation experiments with the large Hopkinson apparatus there ("largest west of the Mississippi") was basically towards the application to the orowan equation:

de/dt = r b v

While working with Dave Wood and others at Caltech we studied the power dependence of velocity on applied stress. I set up a small Hopkinson apparatus there. I hear it is still being used.

Recent discussions with well known persons reveal that the work on dislocations and glide have been forgotten - certainly by the larger fatigue and fracture community . How does one relate glide to the empirical equations of fatigue (LCF and HCF)--- An interesting topic for further research. I pose the question to interested young students and would be willing to enter into correspondence with such people.

NO MONEY PLEASE

iMechanica - The Paris equation - Comments

The Paris equation