PSI - Issue 13

Hiroaki Ito et al. / Procedia Structural Integrity 13 (2018) 1105–1110 Author name / Structural Integrity Procedia 00 (2018) 000–000

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5. Conclusion The model for predicting fatigue life and limit based on microstructural information is modified by considering two important factors, the crack closure and the stress distribution. Predicted fatigue lives and limits showed good agreement with the experimental results for three types of steels with various microstructures. By considering the stress distribution, this model can be applied to other loading conditions with various stress distributions, e.g. bending tests. Acknowledgement This study was supported by Cross-ministerial Strategic Innovation Promotion Program (SIP). The authors express thanks to them. References Tanaka, K., Akinawa, Y., 1986. Modelling of small fatigue crack growth interacting with grain boundary, Eng. Fract. Mech, 24, 803-819 Shibanuma, K., Ueda, K., Ito H., Nemoto, Y., Kinefuchi, M., Suzuki, K., Enoki, M., 2018, Model for predicting fatigue life and limit of steels based on micromechanics of small crack growth, Materials and Design, 139, 269-282. Anai, Y., Niwa, T., Gotoh, K., 2015, Practical formula of the shape evolution of a surface crack under fatigue loading, in : Proceedings of the ASME 2015 34 th International Conference on Ocean, Offshore and Arctic Engineering, OMAE2015-41978 Shen, G., Glinka, G., 1991, Closed form weight functions for a surface semi-elliptical crack in a finite thickness plate, Theoretical and Applied Fracture Mechanics Newman Jr., J.C., 1984, A crack opening stress equation for fatigue crack growth, International Journal of Fracture, 24, R131-R135 McEvily, A., Endo, M., Murakami, Y., 2003, On the square root area relationship and the short crack threshold, Fatigue Fract. Eng. Mater Strict, 26(3), 269-278