The Role of Fretting in the Initiation and Early Growth of Fatigue Cracks in Turbo-Generator Materials

TC Lindley; KJ Nix

doi:10.1520/STP36231S

SYMPOSIA PAPER Published: 01 January 1985

STP36231S

The Role of Fretting in the Initiation and Early Growth of Fatigue Cracks in Turbo-Generator Materials

Source

The reduction in fatigue strength due to fretting has been measured for various combinations of materials used for components in turbo generators. With the range of pad contact pressures and pad spans employed, fretting fatigue strength reduction factors of up to 3.5 were found for 3.5Ni-Cr-Mo-V ferritic steel, 2.5 for 18Mn-4Cr, and 18Mn-18Cr austenitic steels and 11 for 2014A aluminum alloy. Metallography and strain gage methods (to monitor frictional forces) revealed that small cracks could develop by fretting early in fatigue life, and a fracture mechanics approach is developed to describe crack growth.

Author Information

Lindley, TC

Technology Planning and Research Division, Central Electricity Generating Board, Central Electricity Research Laboratories, Materials Branch, Leatherhead, Surrey, U.K.

Nix, KJ

Technology Planning and Research Division, Central Electricity Generating Board, Central Electricity Research Laboratories, Materials Branch, Leatherhead, Surrey, U.K.

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Details

Developed by Committee: E08

Pages: 340–360

DOI: 10.1520/STP36231S

ISBN-EB: 978-0-8031-4921-2

ISBN-13: 978-0-8031-0444-0

The Role of Fretting in the Initiation and Early Growth of Fatigue Cracks in Turbo-Generator Materials

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