Method of stress intensity factor calculation based on the unitary weight finction

A method of stress intensity factor evaluation is presented. Calculating procedure is based on the well known weight function or influence function concept. After significant modifications, a unit an weight function is proposed, which may be easily transformed to obtain a matrix data base adequate for computer use and subsequent storage in its memory. This data may be then applied to different loading functions, including residual stresses.

By separating the geometry of the body from the load applied, one geometric description covers many particular solutions for different loading functions.

Simplified integrating procedure is also described, which makes the computing time of K values very short.