STRESS CONCENTRATION FACTORS FOR MULTIPLE SEMIELLIPTICAL NOTCHES IN BEAMS UNDER PURE BENDING.
Rept. for Jan 63-Sep 66,
AEROSPACE CORP EL SEGUNDO CA LABS DIV
Pagination or Media Count:
Uniformly spaced semielliptical notches in rectangular beams under pure bending are examined photoelastically. Minimum stress concentration factors, produced by multiple elliptical notching of beams, are obtained for wide ranges of notch width, semiminor elliptical axis, notch depth, notch pitch, and depth of beam. In particular, the geometries of the optimum elliptical notch producing the least stress concentration are obtained for a practical range of parameters. Stress concentration factors for beams with multiple semielliptical notches are compared to those for beams with single semielliptical notches and to those for beams with semicircular notches. The maximun reduction of stress concentration factor for beams with multiple semielliptical notches is to approximately 37 percent of the stress concentration factor for beams with single semielliptical notches. Within the range of parameters investigated, the stress concentration factor for beams with multiple semielliptical notches was reduced to 15 to 37 percent less than that for multiple semicircular notches. Author
- Structural Engineering and Building Technology