引張りおよび曲げ形両系列試験片によるクリープき裂成長挙動の支配力学因子に関する検討

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The creep crack growth behavior of the SUS 304 stainless steel was investigated at 650℃ using tension-type (CN and DEN) and bending-type (SEN and CT) specimens, in order to discriminate the most probable governing mechanical parameter of the phenomenon from several candidate mechanical parameters. The following mechanical parameters were examined in this study; stress intensity factor K_I, elastic net section stress (σ_n)_e, rigid-plastic net section stress (σ_n)_p and modified J-integral J' (C* parameter). The effect of temperature on the creep crack growth behavior of center-notched (CN) specimens was also investigated. It was found that the creep crack growth rates could successfully be correlated with J', regardless of the types of specimens selected in this study, while the other three mechanical parameters, K_I, (σ_n)_e and (σ_n)_p, gave poor correlations with the crack growth rates. This result was quite consistent with those in previous studies obtained by using several series of proportional specimens with different tension-type geometries (CN, DEN and round bar). It was concluded that J' is the most probable mechanical parameter which governs the creep crack growth behavior. Temperature increased the creep crack growth rates and the correlation curves of the crack growth rates with K_I and (σ_n)_e [≡(σ_n)_p, in this case] moved upwards and approximately in parallel. However, the correlation curves with J' were almost unaffected by temperature. This may be a very convenient and useful property in various engineering applications.
社団法人日本材料学会の論文
1978-11-15

引張りおよび曲げ形両系列試験片によるクリープき裂成長挙動の支配力学因子に関する検討

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