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izvor podataka: crosbi

Application of modified Locati method in fatigue strength testing of a turbo compressor blade (CROSBI ID 294414)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Braut, Sanjin ; Tevčić, Marina ; Butković, Mirko ; Božić, Željko ; Žigulić, Roberto Application of modified Locati method in fatigue strength testing of a turbo compressor blade // Procedia structural integrity, 31 (2021), 33-37. doi: 10.1016/j.prostr.2021.03.007

Podaci o odgovornosti

Braut, Sanjin ; Tevčić, Marina ; Butković, Mirko ; Božić, Željko ; Žigulić, Roberto

engleski

Application of modified Locati method in fatigue strength testing of a turbo compressor blade

The blades of axial turbomachines (steam and gas turbines, axial compressors) are highly stressed by centrifugal force, temperature, and alternating fluid forces, which leads to vibrations and fatigue cracking. This requires the studious engagement of designers and technologists. In this paper, a procedure for accelerated fatigue testing of a gas turbine compressor blade based on the modified Locati method is presented. The tests were performed on a vibration shaker with the frequency that equal the blade’s first natural frequency. S-N curves were estimated according to two approximate representation namely one-slope and two-slope models. Then, the blades were tested at different stress levels starting at a level below foreseen fatigue strength at the specified fatigue life. In each loading block, a blade was subjected to 2ˑ107 cycles. After the first block was completed, the stress level in the second loading block was increased by 20 MPa and a new 2ˑ107 cycles were applied. A procedure was repeated until the blade failure occurred. It was considered that a blade has failed when its natural frequency drops by more than 2%. After the failure, the fatigue strength was calculated using Palmgren -Miner rule.

Modified Locati method ; accelerated fatigue test ; compressor blade

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Podaci o izdanju

31

2021.

33-37

objavljeno

2452-3216

10.1016/j.prostr.2021.03.007

Povezanost rada

Strojarstvo, Temeljne tehničke znanosti, Zrakoplovstvo, raketna i svemirska tehnika

Poveznice
Indeksiranost