Part 1: Biaxial Thermo-Mechanical Fatigue Response of SS-316 Structures: Isothermal & Thermo-Mechanical Fatigue Life Assessment for Type SS 316
The design of pressurized equipment involves consideration of a wide range of complex load combinations. Cyclic loading involving fatigue of structures is one of the most complex engineering issues. The purpose of this project is to provide the design engineer with a methodology for addressing the complexity of biaxial fatigue problems at elevated temperature where the loading is both mechanical and thermal and the phase relationship between them varies from in-phase to out-of-phase. The project also demonstrates the ability to perform biaxial thermo-mechanical fatigue (TMF) testing.
Typical fatigue data was performed at a constant temperature (isothermal) and under uniaxial conditions. However, typical reactors, pressure vessels, piping or other structural components may be subjected to complex thermal and mechanical transient loading conditions with a wide variety of phase relationships. The objective of this project is to provide the design engineer with a tool for addressing these issues.
Part 2: Biaxial Thermo-Mechanical Fatigue Response of SS-316 Structures: Characterization of Thermo-Mechanical Fatigue Response of Structures Extended for Biaxiality Effect
A biaxial thermo-mechanical fatigue (TMF) model has been developed by extending a biaxial fatigue model for isothermal condition. The proposed model assesses the in-phase and out-of-phase type cycle incorporating the effect of oxidation and creep. The isothermal fatigue model utilizes the concept of triaxiality factor (TF) which accounts for the state of stress effect on material's fracture ductility. The TMF biaxial strain ratios varied from 0 to 3.65 at cyclic temperature of 399-621°C (750-1150°F). All tests were strain controlled using tubular specimens. Heating was by induction and the cooling was by natural convection.
| File Size : | 1
file
, 1.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 35 |
| Published : | 2001 |
