Class
Article
College
College of Engineering
Presentation Type
Oral Presentation
Abstract
Thermo-Mechanical Fatigue (TMF) is the combination of cyclic heating and loading and is characterized by the relative offset between peak temperature and load. This offset, referred to as phase angle, has been predominantly studied at two extremes, In-Phase (IP) and Out-of-Phase (OP). TMF failure is caused by a combination of creep, oxidation, and fatigue, where IP failure is dominated by creep and OP failure is dominated by oxidation. The life of material undergoing TMF can vary drastically depending on phase angle and the prevalent damage mechanism. The goal of this research is to determine whether TMF life can be extended under different phase angles. A series of TMF experiments have been run on Hastelloy-X using a Gleeble 1500D thermo-mechanical system, which applies cyclic heating and loading inside an environmental chamber. IP and OP testing was first performed at a variety of strain levels to develop a baseline. Then testing was performed introducing phase angle deviations from both IP and OP to further characterize TMF behavior under a variety of loading conditions.
Start Date
4-8-2020 12:00 PM
End Date
4-8-2020 1:00 PM
A Study on Phase Angle Deviation During Thermomechanical Fatigue of Hastelloy X
Thermo-Mechanical Fatigue (TMF) is the combination of cyclic heating and loading and is characterized by the relative offset between peak temperature and load. This offset, referred to as phase angle, has been predominantly studied at two extremes, In-Phase (IP) and Out-of-Phase (OP). TMF failure is caused by a combination of creep, oxidation, and fatigue, where IP failure is dominated by creep and OP failure is dominated by oxidation. The life of material undergoing TMF can vary drastically depending on phase angle and the prevalent damage mechanism. The goal of this research is to determine whether TMF life can be extended under different phase angles. A series of TMF experiments have been run on Hastelloy-X using a Gleeble 1500D thermo-mechanical system, which applies cyclic heating and loading inside an environmental chamber. IP and OP testing was first performed at a variety of strain levels to develop a baseline. Then testing was performed introducing phase angle deviations from both IP and OP to further characterize TMF behavior under a variety of loading conditions.