Wide Range Stress Intensity Factor and Crack-Mouth-Opening Displacement Expressions Suitable for Short Crack Fracture Testing with Arc Bend-Chord Suppport Samples

The correct short crack limit solutions for both the stress intensity factor and the crack-mouth-opening displacement are derived for the arc bend- chord support specimen. The short crack limit, along with the deep crack limit, is used to develop wide range interpolating polynomials to estimate the stress intensity factor and crack-mount-opening displacement over a wide range of possible specimen configurations and crack lengths. The polynomials are developed such that the limit for short cracks is the most accurate. More accurate expressions can be found elsewhere for crack lengths and specimen geometries more commonly used in fracture toughness determination or fatigue crack propagation. KR