A STUDY OF THE EFFECT OF SUPERIMPOSED STRESS CONCENTRATIONS.
Rept. for 1 Apr 63-31 Mar 64,
SYRACUSE UNIV N Y
Pagination or Media Count:
The effect of tensile stress fields due to holes, superimposed on the stress fields due to external notches, was investigated by means of photoelastic techniques and tensile fracture tests. A columbia resin photoelastic material, CR-39, and the titanium alloy 2.5Al-16V, aged to a brittle condition, were used to construct simple model systems for these studies, as a first step to simulate a prototype ceramic material. It was found that no significant degree of interaction occurred between the stress fields of holes and the stress field due to the notch. Although the holes produced considerable localized stress inhomogeneities, this effect did not extend to the root of the notch where the maximum stress was solely determined by the stress concentration factor of the notch. The results of the tensile fracture tests confirmed the stress field studies. It was concluded that elastic stress field equations of notches and holes provide a satisfactory means of estimating the earliest possible interaction of a stress raisers. Author