Investigation of the Distribution of Tensile and Bending Stresses in Notched Flat Bars

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Report Number: ASD TDR 63-515
Author(s): Neuber, Ing. H.
Corporate Author(s): Institute for Technical Mechanics
Laboratory: AF Materials Laboratory
Date of Publication: 1963-07
Pages: 59
Contract: AF 61(052)-200
DoD Project: 7351 - Metallic Materials
DoD Task: 735106 - Behavior of Metals
Identifier: AD0415619

Abstract:
In the theoretical part the treatment of stress concentration in plates of arbitrary thickness is outlined. By means of the author's "Three functions set" the complete solution for these problems can be established. The usual stress functions are to be extended by additional functions in order to fulfill the complete boundary conditions in flat bar problems as well as in plate bending problems. Results of the theory are given for infinite flat bars in tension and plates in bending with a circular hole. The experimental part contains the results of static and fatigue tests with notched specimens. Static tests were performed with medium thick plates containing a pair of semicircular notches in transverse bending. Stress- and strain distributions in the elastic and plastic range respectively and the dependence of the stress concentration factor on the nominal stress are given. Push-pull fatigue tests had been carried out with specimens containing circular holes of various sizes. The purpose of these tests was to study the influence of stress concentration on the fatigue strength.

Provenance: Bearcat

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