高温両振り応力下の鋼の変形挙動

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Realistic constitutive equations of deformation under reversed cyclic stresses at elevated temperatures are necessary both for strain analysis of structural members and for fracture analysis of cracked materials. As the first step to obtain such equations, reversed cyclic creep tests were carried out on a carbon steel and an austenitic stainless steel under various conditions by changing stress amplitude, period (τ) , the ratio of stresses in compressive and tensile periods (σ_<max>/σ_<min>), and the ratio of compression hold time to tension hold time (τ_<com>/τ_<ten>). The following findings were obtained in the study. The strain rates in the tensile and compressive periods under a perfectly reversed cyclic stress (σ_<max>=|σ_<min>| and τ_<com>=τ_<ten>) are nearly equal to the primary creep rates in static creep tests at stresses equal to the maximum and the minimum stresses of the cyclic creep test, respectively. The strain rate in the tensile period under an imperfectly reversed cyclic stress (σ_<max>>|σ_<min>| or τ_<com>>τ_<ten>) is smaller than the primary creep rate, but larger than secondary creep rate in a static creep test at a stress equal to the maximum stress. Strain hardening seems to be fully eliminated during creep deformation in the former case but partially in the latter case. Although these trends qualitatively support the auxiliary rule of strain hardening proposed by C. E. Pugh et al., the observed strain rates are frequently larger than those estimated by using the auxiliary rule.
社団法人日本材料学会の論文
1980-02-15

高温両振り応力下の鋼の変形挙動

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