引張強さに及ぼす試片長さの影響

概要

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The effect of specimen length on tensile strength has been examined by the statistical theory of the tensile strength using a small size of data in the previous report. The results obtained are summarized as follows. (1) The mean value σ_M of tensile strength decreases with the increase of specimen length l, as represented by the following equation: where σ_M = αl^<-b> σ_M =:α_1l^<-b> for l≦l_s,σ_M =:α_2l^<-b2> for l>l_s where α_1, α_2, b_1 and b_2 are constants which depend on the chemical composition of materials and metallurgical structure, and α_1>α_2 and b_1>b_2. l_s is about 52 mm in the present case. (2) The scattering range [(σ_<max>)_r, (σ_<min>)_r] of tensile strength decreases as l becomes longer or shorter than l_s=52 mm. (3) The length l_s=52 mm is equal to the length of the standard specimen. Accordingly, the scattering range is maximum for the standard specimen. Moreover, the minimum value of the tensile strength σ at l_s is less than the minimum value of σ, at any other l. Therefore, the tensile strength σ of a specimen is represented as σ≧((σ_<min>)_r)_<l=52>, where ((σ_<min>)_r)_<l=52> is the minimum value of tensile strength at l_s.
社団法人日本材料学会の論文
1978-05-15