Introduction to Fracture Mechanics phần 2 pptx

Irwin introduced, for this purpose, the energy release

rate G which is defined as

. 

  d

dWP

WP, and thus G, can be evaluated for different loading

G

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WP, and thus G, can be evaluated for different loading

conditions. This definition is valid for both linear and

nonlinear elastic deformation of the body. G is a function

of the load (or displacement) and crack length. It is

independent of the boundary conditions, in particular

whether the loading is fixed-displacement or fixed-load.