Abstract
In this paper, in order to evaluate the approximate equivalent accumulation area Sdmax 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 Sv were compared with Sdmax. With various Sv, approximate Gaussian distribution of the yield loads was obtained based on mathematical expectation E(Fs) and standard deviation σ(Fs), and the changing rule of E(Fs) as a function of Sv was obtained. A decrement of E(Fs) of 2.6% was obtained when Sv increased from 3654.4 μm2 to 6982.8 μm2. The approximate ratio of Sdmax to the initial sectional area So was evaluated as 3.0%.
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