The results of an experimental and analytical investigation on the use of a precracked coupon mounted onto a structure for monitoring the effect of service loads upon fatigue crack growth in the structure are discussed. The precracked coupon of 'gage' is a simple device which provides a convenient means for determining the potential damage in a structure since the gage takes into account the mechanics of crack growth. Experimental results ...
A laser interferometry technique is described which is capable of resolving crack surface displacements to a high degree of sensitivity (about 0.1 micron). The method provides continuous measurements of the free surface crack profile in metal specimens without being limited by rigid body displacements. Using the laser interferometry procedure to determine fatigue crack profiles in 2024-T851 aluminum specimens, it was possible to measure the load at which the crack faces ...
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