Introduction to Fracture Mechanics phần 5 docx

Substitute the known expression for σ xx, σ yy and σ xy

in the Mode I crack problem (derived last time) and

find that:





 





 

2

1 sin

2

cos

2 1

 





r

KI

K    

6

(plane strain); σ3= 0 (plane stress). 2

cos

2 3 2 



 

r

KI







 





  2

1 sin

2

cos

2 2

 





r

KI