二段多重および多段多重の等価両振応力を求める計算方法

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Although two kinds of stresses σ_<a1> and σ_<a2>, are applied in two-level multiple-step wave or two-level two-step wave fatigue tests, those stresses must be translated into one stress such as alternating stress σ_<a0>, when they are shown on σ_a-N curves. In this study, a way to calculate the equivalent alternating stress from the data of partial alternating wave tests is examined. The results obtained are as follows: (1) In small strain hardening materials, the equivalent alternating stress σ_<aoe> may be calculated from the data of fatigue tests of repeated stress σ_a with the mean stress σ_m. In this case, the values of η were about 0.60 at 3 600 cpm and 0.50 at 40 cpm in the range of ∞>A>0.5〜0.7 (A=σ_a/σ_m). The stress range diagram calculated from η=0.50 is very close to the linear range diagram or that obtained by the modified Goodman method. (2) When one of the lives Σn_1 under σ_<a1> and Σn_2 under σ_<a2> is given in two-level multiple-step wave tests under σ_<a1> and σ_<a2>(σ_<a1>>σ_<a2>), the other can be estimated very close to the experimental data by using the analyzed result. (3) The analyzed result of two-level multiple-step or two-level two-step wave can be extended to the case of multiple-level multiple-step wave. Hence, it seems possible to calculate the equivalent alternating stress σ'_<aoe> and the number of cycles to fracture N'_<eq> In the multiple-level multiple-step wave.
社団法人日本材料学会の論文
1978-06-15

二段多重および多段多重の等価両振応力を求める計算方法

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