The fatigue crack growth rate and crack opening displacement in 18G2A-steel under tension |
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| Affiliation: | 1. Division of Solid Mechanics, Linköping University, SE-58183 Linköping, Sweden;2. Division of Engineering Materials, Linköping University, SE-58183 Linköping, Sweden;1. Division of Engineering Materials, Department of Management and Engineering, Linköping University, SE-58183 Linköping, Sweden;2. Siemens Industrial Turbomachinery AB, Finspång SE-612 31, Sweden;1. Institut Pprime, Téléport 2, 1 avenue Clément Ader, 86961 Futuroscope Chasseneuil Cedex, France;2. Framatome, 1 Pl. Jean Millier, 92400 Courbevoie, France;3. EDF R&D, 7 Boulevard Gaspard Monge, 91120 Palaiseau, France;1. Division of Engineering Materials, Department of Management and Engineering, Linköping University, SE-58183 Linköping, Sweden;2. Department of Applied Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden;3. GKN Aerospace Engine Systems, R&T Centre, SE-46181 Trollhättan, Sweden |
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| Abstract: | In the paper, the results of crack tip opening displacement (CTOD) and crack opening displacement (COD) in place of crack initiation as well as the fatigue crack growth rate in higher strength steel are presented. The investigation were carried out on flat specimens with central notch under constant amplitude tensile fatigue loading at stress ratio R = 0.2 and different value of the stress σmax. The test results showed that with growth of crack length l grew values of the CTOD and COD. In the work, it was proposed calculation of the CTOD value on basis various dependence of plastic zone radius on crack tip. |
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