高耐力熱合金に対する全ひずみエネルギーに基づく疲労・クリープ相互作用下の寿命予測法の提案

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A new life prediction method was proposed for high strength materials under fatigue-creep interaction (FCI) based on their tensile total strain energy behavior. The net tensile hysteresis snery is now being used to evaluate FCI life in the frequency modified damage function rule developed by W. J. Ostergren. For high strength materials, however, this damage rule seems to require some modificatio to give good lie assesment, because the elastic strain rangeis much larger than the inelastic strain range in the FCI behavior of these materials. In this paper, strain controlled tensile or compressive strain hold tests with F-F, F-S and S-F wave forms were performed for Cast Rene 80. The total strain energy including a large elastic strain energy was defined, and FCI life was obtained against this strain energy including a large elastic strain energy was defined, and FCI life was obtained against this strain energy. multiple regression analysis was carried out to assess the relationship between strain energy and cycles to failure and was expressed numerically to improve life estimation accuracy. Finally, and frequency modified total strain energy parameter was defined to evaluate the failure lives (N_f) of high strength materials such as Rene 80 under the FCI condition. The total tensile strain energy (ΔW_<TT>) and the time (τ_<TT>) under tensile stress loading were used to define this tensile strain energy parameter. Thus, ΔW_<TT>・τ^n_<TT>・N^m_f=C where, n, m and C are constants. A similar relation was also obtained between total strain energy (ΔW_<TT>) and crack initiation life (N_c).
社団法人日本材料学会の論文
1989-07-15

高耐力熱合金に対する全ひずみエネルギーに基づく疲労・クリープ相互作用下の寿命予測法の提案

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