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RISAnalysis of Multi Axial Creep–Fatigue Damage on an Outer Cylinder of a 1000 MW Supercritical Steam Turbine
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A multiaxial continuum damage mechanics (CDM) model was proposed to calculate the multiaxial creep–fatigue damage of a high temperature component. A specific outer cylinder of a 1000 MW supercritical steam turbine was ...
Numerical Analysis of Fatigue Life Improvement by Optimizing the Startup Phase for a 1000 MW Supercritical Steam Turbine Inner Casing
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The fatigue behavior of a specific inner casing of a 1000 MW supercritical steam turbine was investigated during a complete startup phase. The Ramberg–Osgood model and Manson–Coffin strainlife law were used to describe ...
Numerical Investigation of Creep–Fatigue Behavior in a Steam Turbine Inlet Valve Under Cyclic Thermomechanical Loading
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The aim of this study was to investigate the cyclic creep–fatigue interaction behavior in a steam turbine inlet valve under cyclic thermomechanical loading conditions. Three years and nine iterations of idealized ...
Multidisciplinary Design Optimization for Performance Improvement of an Axial Flow Fan Using Free-Form Deformation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper describes a multidisciplinary design optimization for performance improvement of an electric-ducted fan rotor using free-form deformation (FFD) and data mining techniques. A practical partitioning approach for ...
Comparative Study of Flange to Seal Contact Couplings With Bolt Relaxation Under Creep Condition
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Future coalfired steam turbines promise increased efficiency and low emissions. However, this comes at the expense of increased thermal load from higher inlet steam temperatures and pressures leading to severe creep that ...
A Continuum Damage Mechanics Based Viscoplastic Model of Adapted Complexity for High Temperature Creep–Fatigue Loading
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A continuum damage mechanics (CDM) based viscoplastic constitutive model is established in this study to describe the fully coupling of creep and fatigue behavior. The most significant improvement is the introduction of a ...
A Comprehensive Heat Transfer Study Inside a Steam Turbine Valve: Experiment, Numerical Simulation, and Simplified Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In a steam turbine system, one of the main factors limiting the operational flexibility is the thermal stress associated with a high-temperature gradient within the control valves, which often leads to structural damage ...
Application of a Creep Damage Constitutive Model for the Rotor of a 1000 MW Ultrasupercritical Steam Turbine
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A damagebased creep constitutive model for a wide stress range is applied to the creep analysis of a 1000 MW ultrasupercritical steam turbine, the inlet steam of which reaches 600 آ°C and 35 MPa. In this model, the ...
Finite Element Analysis of the Effects of Thermally Grown Oxide Thickness and Interface Asperity on the Cracking Behavior Between the Thermally Grown Oxide and the Bond Coat
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Finite element simulations based on an interface cohesive zone model (CZM) have been developed to mimic the interfacial cracking behavior between the α−Al2O3 thermally grown oxide (TGO) and the aluminum-rich Pt–Al metallic ...
A Model-Guided Neural Network for the Prediction of Creep Behavior Under in-Service Conditions
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Data-driven neural network methods have been widely applied for the prediction of stress–strain behavior, but have proven ill-suited for the extrapolation of time-dependent creep behavior. To overcome this problem, we ...