Fatigue Crack Propagation in Thin Wires of Ultra-High Strength Steel

Jean Petit; C. Sarrazin-Baudoux

doi:10.4028/www.scientific.net/KEM.627.153

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Fatigue Crack Propagation in Thin Wires of Ultra-High Strength Steel

Abstract:

Fatigue crack propagation is studied in thin wires of about 1 mm in diameter of an ultrahigh strength steel (σ_max> 2400MPa) in ambient air and in air with controlled residual humidity. A specific equipment is developed based on an electro-dynamic testing machine equipped with an environmental chamber for air humidity control. Threshold tests are run using a load shedding procedure specifically adapted to the specimen size. The relation between load ratio and crack closure is evaluated from constant K_max tests. The results are discussed on the basis of fracture surface observations and of existing modelling for environmentally assisted fatigue crack propagation.

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Periodical:

Key Engineering Materials (Volume 627)

Pages:

153-156

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.627.153

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Online since:

September 2014

Authors:

Jean Petit*, C. Sarrazin-Baudoux

Keywords:

Cold Drawn Pearlitic Steel, Effective Threshold, Fatigue Crack Propagation, Load Ratio, Residual Atmospheric Humidity, Thin Wire, Threshold

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