On the design of porous structures with enhanced fatigue life
| Autor: | Minh Quan Pham, Thomas Scarinci, Scott Yandt, Christopher Booth-Morrison, Katia Bertoldi, Matthew Christopher Innes, Ahmad Rafsanjani, Farhad Javid, Megan Schaenzer, Ali Shanian, Jia Liu, Miklos Gerendas, David Backman |
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| Rok vydání: | 2017 |
| Předmět: |
Gas turbines
Materials science Mechanical Engineering Fatigue testing Bioengineering Fracture mechanics 02 engineering and technology Soft modes 021001 nanoscience & nanotechnology Rotation Combustion 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Chemical Engineering (miscellaneous) Deformation (engineering) Composite material 0210 nano-technology Porosity Engineering (miscellaneous) |
| Zdroj: | Extreme Mechanics Letters. 16:13-17 |
| ISSN: | 2352-4316 |
| Popis: | Many components of gas turbines, including the combustion liners, ducts, casings and sealing structures, comprise metallic sheets perforated with arrays of circular cooling holes. These parts are highly prone to fatigue failure due to the stresses induced by temperature variations during operation. Here, we demonstrate both experimentally and numerically that the fatigue life of these porous components can be greatly enhanced by carefully designing the pores’ shape. In particular, we show that while the fatigue life of a metallic sheet with a square array of conventional circular cooling holes is 100 k cycles, by replacing the pores with novel orthogonal S-shaped holes the life of the structure increases up to more than one million cycles. This is because the S-shaped pores introduce a soft mode of deformation based on rotation of the domains between neighboring holes that significantly affect the stress distribution and crack propagation in the structure. |
| Databáze: | OpenAIRE |
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