Accession Number : AD0433263


Title :   STRESS CONCENTRATION FACTORS FOR SEMIELLIPTICAL NOTCHES IN BEAMS UNDER PURE BENDING,


Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF


Personal Author(s) : Tsao,C H ; Ching,A ; Okubo,S


Report Date : 25 Oct 1963


Pagination or Media Count : 36


Abstract : Elliptical notches in rectangular beams under pure bending are examined photoelastically. Stress concentration factors due to a single elliptical notch are obtained for wide ranges of 2a/h and d/h, wher 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. Almost 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 nonelliptical. The graphs will enable the designers to find the stress concentration factors of elliptical notches and to pick out the geometry of the optimum notch which will give the least stress concentration for any given values of 2a/h and d/h. Stresses and the stress concentration factors at the bottom of the beam opposite the notch are also obtained. These stresses, though smaller in magnitude, are of an opposite sign to the peak stress at the notch. For brittle materials a smaller tensile stress may be more critical than a large compressive stress; therefore, these stress concentration factors are also given. (Author)


Descriptors :   *BEAMS(STRUCTURAL) , DEFORMATION , PHOTOGRAPHIC ANALYSIS , CREEP , PHOTOELASTICITY , LOADS(FORCES) , COMPRESSIVE PROPERTIES


Distribution Statement : APPROVED FOR PUBLIC RELEASE