Author(s)

N.-A. Noda, Y. Takase & K. Monda

Abstract

Stress concentration of V-shaped notches in round and flat bars under various loading is important especially for the test specimen used to investigate the mechanical properties of materials. For notched bars, Neuber proposed simple approximate formula K^ useful for wide range of notch shape: 1/(K^ -1)™ = l/(Kfe -1)™ +l/(K|d -1) and m=2. Here, K% and K%, are exact solutions for shallow and deep notches, respectively. In this study, first, most suitable exponent m is determined so as to minimize the difference between K^ and accurate K,, that is, the results of body force method. Next, by applying the least squares method to the ratio K/K^ more accurate formulae are proposed. The formulae proposed in this paper are found to give the stress conc

Keywords