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crack arrest

can we stop cracks due to elastic modulus changes ahead of crack tips?

Submitted by Mike Ciavarella on

Dear Colleague

   It is known that ahead of a crack subject to static or fatigue loading microcracking and damage makes the material soften (of smaller elastic modulus) but also its strength degrades (in composite materials, there are so called “wearout models” which associate strength reduction exactly to the reduction of modulus).