13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- 0 100 200 300 400 500 0 2 4 6 8 10 Strain [×10−6] Load [kN] (a) 0 20 40 60 0 2 4 6 8 10 Subtracted strain [×10−6] Load [kN] (b) Figure 10. Example of relationship between load and strain (at N = 4.0 × 104 cycles): (a) strain is measured strain and (b) strain is subtracted strain 5. Conclusions The mechanical model for the Mode II experimental method proposed in the previous paper was modified. Thus, the load was considered to be equally divided into two halves and applied to each cantilever of the specimen. Furthermore, a new method for determining the friction between the crack faces was proposed. The crack length and friction between the crack faces were measured using an AC potential method and deduced from the load-strain curve, respectively. From this measurement and deduction, ΔKIIeff could be determined. However, the value of ΔKIIth has not yet been determined. It will be determined using this method in a future study. Acknowledgements This work was supported by JSPS KAKENHI Grant Number 24560103. References [1] American Society for Testing and Materials, ASTM E647-11ε1: Standard test method for measurement of fatigue crack growth rates, 2011. [2] A. Otsuka, K. Mori and K. Tohgo, Current research on fatigue cracks, material research series, The society of materials science, Japan, 1 (1985) 127-55. [3] Y. Murakami, S. Hamada, Fatigue Fract. Engng. Mater. Struct., 20 (1997) 863-70. [4] Y. Murakami, C. Sakae and S. Hamada, Engineering Against Fatigue, edited by J. H. Beynon, M.W. Brown, T. C. Lindley, R. A. Smith & B. Tomkins, Taylor & Francis, UK. [5] A. Otuska, Y. Fujii and K. Maeda, Fatigue Fract. Engng. Mater. Struct., 27 (2004) 203-212. [6] H. Matsunaga, N. Shomura, S. Muramoto and M. Endo, Fatigue Fract. Engng. Mater. Struct., 34 (2011) 72-82. [7] M. Liu, S. Hamada, Procedia Engineering, 10 (2011) 1949-1954. [8] M. Liu, S. Hamada, Proceedings of 19th European Conference on Fracture (ECF19), (2012) ID 455.
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