Stress intensity factor

It describes a kind of weightage of the stress field as we go toward the crack tip with square root of distance singularity. It's key quantity based on known loading and crack geometry that describes full form of stress field near by crack tip. G is the global quantity which can be described in terms of SIF near under some condition. So, it's describing how much global energy is flowing in the crack tip through K-dominance field. It's not just simple energy necessary to create two new surfaces. Yes, it is true but only at the quasi-static condition when SSY condition is valid.

I hope, this is enough to explain your question.

Manish

Hi

Anderson, textbook, shows that SIF of slant line crack can be approximated in terms of that of horizontal (tensile dominant) crack. i.e. crack oriented with angle (B) have two SIF-components: the SIF-tension=SIF(B=0, horizontal)*(sin(B))^2, SIF-shear=SIF(B=0, horizontal)*(cos(B)*sin(B))

My question if a slant-crack initiates from a central hole under tension load, how can derive/approximate the SIF formula in terms of mode-I as in the case above.

using the modification above in terms of the angle of the crack is not enough as the stress concentration change with each angle and then the stress distribution along the crack line changes for each crack angle. so with salnt-crack emerge from hole, two factors have effect on SIF: the angle, and the stress concentration effect on crack lengths relative to the hole radius

some references presented a Table of factors of SIF-tension, and shear, for specific angles but cannot interpolate them to get other crack angles. 

Is it possible to express the inclined radial crack emanating from a hole, under tension by the specimens of horizontal-tensile crack under biaxial load?

Any ideas are appreciated

thanks

Wazy