STRESS CONCENTRATION FACTORS FOR SEMIELLIPTICAL NOTCHES IN BEAMS UNDER PURE BENDING

摘要

Elliptical notches in rectangular beams under pure bending are examined photo elastically. Stress concentration factors due to a single elliptical notch are obtained for wide ranges of 2a/h and d/h, where 2a, d, and h are the width of notch, depth of notch, and depth of beam, respectively. In particular, the geometries of the optimum elliptical notches producing the least stress concentrations are obtained. Al-most the whole elliptical boundary of these notches are stressed to the same peak, which indicates that these notches will probably produce the least stress concentrations among all notches, elliptical or no elliptical.