Evaluation of equivalent accumulation area of internal defects based on statistical law of yield loads

In this paper, in order to evaluate the approximate equivalent accumulation area S-dmax of initial internal defects in the dangerous cross section of structures, a series of Vickers indentations were prepared on the gage part of well polished Ti-6Al-4V specimens as emebedded defects, the indentation areas S-v were compared with S-dmax. With various Sv, approximate Gaussian distribution of the yield loads was obtained based on mathematical expectation E(F-s) and standard deviation sigma(Fs), and the changing rule of E(F-s) as a function of S-v was obtained. A decrement of E(F-s) of 2.6% was obtained when S-v increased from 3654.4 mu m(2) to 6982.8 mu m(2). The approximate ratio of Sdmax to the initial sectional area S-o was evaluated as 3.0%. (C) 2015 Elsevier B.V. All rights reserved.