| About this Abstract |
| Meeting |
2023 AWS Professional Program
|
| Symposium
|
2023 AWS Professional Program
|
| Presentation Title |
Thermo-Mechanical Fatigue of Welding Defect-containing Boiler Water Walls |
| Author(s) |
Suvan Dev Chourhury, Leijun Li |
| On-Site Speaker (Planned) |
Suvan Dev Chourhury |
| Abstract Scope |
The outer surfaces of boiler water walls are exposed to fire or air, while the inner tubular surfaces are exposed to superheated steam flow. This service condition makes the water walls susceptible to thermos-mechanical fatigue, particularly during start-ups and shutdowns, which may lead blow-hole failure. Water walls are welded structures with defects that are potential sites for initiating fatigue cracks.
This study examines the defect-free and defect-containing specimens extracted from the welded membrane of water walls for their fatigue performance. X-ray computed tomography (XCT) has been used for a three-dimensional characterization of the lack of fusion and porosity defects. High temperature (at the water wall operating temperature) LCF test is performed at the strain levels matching the actual service conditions. A finite element fatigue damage model using ABAQUS is developed to simulate the fatigue life cycles of the defect-free welded membrane specimens. The calibrated model considers the inelastic hysteresis energy per cycle to simulate fatigue damage initiation and propagation for both defect-free and defect-containing specimens. Finally, the weld defects analyzed from post-processing of the XCT scans have been modelled into the water wall ABAQUS model to predict the fatigue cycles of defect-containing water walls. |
| Proceedings Inclusion? |
Undecided |