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The stress intensity factor and Young's Modulus

Adjal's picture

The stress intensity factor and Young's Modulus 

It is evident that stress intensity factor considered as  the most important factor in fracture mechanics which used for evaluating the stress state near to tip crack . However this factor depends up many parameters (such us normal loading, cracks size and its geometry). my question is as follow 

The stress intensity factor is depend of Young's modulus, How to identify the effect of Young's modulus on the variation of stress intensity factors. 

My Colleague working on that and she is found that (Using numerical code Ansys) the same intensity factor value for different materials, How to explain that even we have different value of Young's modulus.

Best regards 


Zhigang Suo's picture

For a linearly elastic body, under traction-prescribed boundary conditions, the stress intensity factor is independent of Young's modulus.  See my class notes on crack tip field.

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