繰返し衝撃引張荷重に対する鋼材のき裂発生と進展寿命の予測

概要

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In order to study the effect of the loading time of impact tensile loads on the crack propagation rate, impact fatigue tests were carried out on circumferential V-notched specimens of 0.2% carbon steel by using a repeated impact tensile loading apparatus. Based on the experimental data, the crack initiation life and the crack propagation life for circumferential V-notched specimens were estimated empirically. The results obtained were summarized as follows; (1) The relation between the striation spacing (S) and the stress intensity factor (ΔK_I) is given empirically by, S=C_0T^<n_s>ΔK_I^<m_s> where C_0, n_s, and m_s are experimental constants, and T is the loading time of impact tensile loads. (2) The crack propagation life (N_p) and the crack initiation life (N_c) can be estimated by the following formulas and the estimated values were found to agree with the experimental results.[numerical formula] [numerical formula] where D^*. m^*, and n^* are experimental constants, a_i is the initial crack size, and a_f is the final crack size.
社団法人日本材料学会の論文
1980-05-15