A Z-parameter method is used to evaluate the damage process of HK40 austenitic steel. By using Z-parameter based on the Larson-Miller method, the nonlinear master curve of the log stress vs Larson-Miller parameter P c...A Z-parameter method is used to evaluate the damage process of HK40 austenitic steel. By using Z-parameter based on the Larson-Miller method, the nonlinear master curve of the log stress vs Larson-Miller parameter P can be expressed as： P=27.74-3.41gσ-0.032σ, and a family of curves parallel to the master curve can be written as： P=（27.74-Z）-3.41gσ-0.032σ, where Z represents the magnitude of the deviation from the master curve. According to the creep rupture data both from different segments of a serviced tube and from the same segment locations with different service time, the value of parameter Z has close relationship with the deterioration of creep rupture properties. The damage state of the samples is evaluated by monitoring the changes in natural frequency f and Young＇s modulus E, and the relationships between Z and the damage parameters are discussed.展开更多
A new general parameterization with eight mixing parameters among Z, γ and an extra neutral gauge boson Z is proposed and subjected to phenomenological analysis. We show that in addition to the conventional Weinberg ...A new general parameterization with eight mixing parameters among Z, γ and an extra neutral gauge boson Z is proposed and subjected to phenomenological analysis. We show that in addition to the conventional Weinberg angle θW , there are seven other phenomenological parameters, G , ξ, η, θl, θr, r and l, for the most general Z-γ-Z mixings, in which parameter G arises due to the presence of an extra Stueckelberg- type mass coupling. Combined with the conventional Z-Z mass mixing angle θ , the remaining six parameters, ξ, η, θl θ , θr θ , r and l, are caused by general kinetic mixing. In all eight phenomenological parameters, θW , G , ξ, η, θl, θr , r and l, we can determine the Z-Z mass mixing angle θ and the mass ratio MZ/MZ . The Z-γ-Z mixing that we discuss are based on the model-independent description of the extended electroweak chiral Lagrangian （EWCL） previously proposed by us. In addition, we show that there are eight corresponding independent theoretical coefficients in our EWCL, which are fully fixed by our eight phenomenological mixing parameters. We further find that the experimental measurability of these eight parameters does not rely on the extended neutral current for Z , but depends on the Z-Z mass ratio.展开更多
文摘A Z-parameter method is used to evaluate the damage process of HK40 austenitic steel. By using Z-parameter based on the Larson-Miller method, the nonlinear master curve of the log stress vs Larson-Miller parameter P can be expressed as： P=27.74-3.41gσ-0.032σ, and a family of curves parallel to the master curve can be written as： P=（27.74-Z）-3.41gσ-0.032σ, where Z represents the magnitude of the deviation from the master curve. According to the creep rupture data both from different segments of a serviced tube and from the same segment locations with different service time, the value of parameter Z has close relationship with the deterioration of creep rupture properties. The damage state of the samples is evaluated by monitoring the changes in natural frequency f and Young＇s modulus E, and the relationships between Z and the damage parameters are discussed.
基金Supported by National Natural Science Foundation of China(10875065,10947152,11005084)
文摘A new general parameterization with eight mixing parameters among Z, γ and an extra neutral gauge boson Z is proposed and subjected to phenomenological analysis. We show that in addition to the conventional Weinberg angle θW , there are seven other phenomenological parameters, G , ξ, η, θl, θr, r and l, for the most general Z-γ-Z mixings, in which parameter G arises due to the presence of an extra Stueckelberg- type mass coupling. Combined with the conventional Z-Z mass mixing angle θ , the remaining six parameters, ξ, η, θl θ , θr θ , r and l, are caused by general kinetic mixing. In all eight phenomenological parameters, θW , G , ξ, η, θl, θr , r and l, we can determine the Z-Z mass mixing angle θ and the mass ratio MZ/MZ . The Z-γ-Z mixing that we discuss are based on the model-independent description of the extended electroweak chiral Lagrangian （EWCL） previously proposed by us. In addition, we show that there are eight corresponding independent theoretical coefficients in our EWCL, which are fully fixed by our eight phenomenological mixing parameters. We further find that the experimental measurability of these eight parameters does not rely on the extended neutral current for Z , but depends on the Z-Z mass ratio.
