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[1] Segal, V.M., Materials processing by simple shear. Materials Science & Engineering: A, 197, pp. 157–164, 1995. [Crossref]
[2] Valiev, R.Z., Structure and mechanical properties of ultrafine-grained metals. Materials Science & Engineering: A, 234–236, pp. 59–66, 1997. [Crossref]
[3] Agnew, S.R. & Weertman, J.R., Cyclic softening of ultrafine grain copper. Materials Science & Engineering: A, 244, pp. 145–153, 1998. [Crossref]
[4] Vinogradov, A. & Hashimoto, S., Multiscale phenomena in fatigue of ultra-fine grain materials-an overview. Materials Transactions, 42, pp. 74–84, 2000. [Crossref]
[5] Brebbia, C.A., Telles, J.C.F. & Wrobel, L.C., (eds), Boundary Element Techniques, Springer-Verlag: Berlin and New York, pp. 11–13, 1984.
[6] Höppel, H.W., Zhou, Z.M., Mughrabi, H. & Valiev, R.Z., Microstructural study of the parameters governing coarsening and cyclic softening in fatigued ultrafine-grained copper. Philosophical Magazine -A, 82, pp. 1781–1794, 2002. [Crossref]
[7] Wu, S.D., Wang, Z.G., Jiang, C.B., Li, G.Y., Alexandrov, I.V. & Valiev, R.Z., The formation of PSB-like shear bands in cyclically deformed ultrafine grained copper processed by ECAP. Scripta Materiala, 48, pp. 1605–1609, 2003. [Crossref]
[8] Kunz, L., Lukáš, P. & Svpboda, M., Fatigue strength, microstructural stability and strain localization in ultrafine-grained copper. Materials Science & Engineering: A, 434, pp. 97–104, 2006. [Crossref]
[9] Fang, D., Zhang, P., Duan, Q., Wu, S., Zhang, Z., Li, J. & Zhao, N., Fatigue behavior of Al-Cu alloy subjected to different number of ECAP passes. Advanced Engineering Materilas, 9, pp. 860–866, 2007. [Crossref]
[10] Zhang, Z.F., Wu, D.S., Li, Y.J., Liu, S.M. & Wang, Z.G., Cyclic deformation and fatigue properties of Al–0.7 wt. % Cu alloy produced by equal channel angular pressing. Materials Science & Engineering, A, 412, pp. 279–286, 2005. [Crossref]
[11] Goto, M., Han, S.Z., Ahn, J.H., Yakushiji, T., Euh, K., Kim, S.S. & Lee, J., The role of mixed-mode deformation at the crack tip on shear banding and crack propagation of ultrafine-grained copper. International Journal of Fatigue, 66, pp. 220–228, 2014. [Crossref]
[12] Iwahashi, Y., Wang, J., Horita, Z., Nemoto, M. & Langdon, T.G., Principle of equalchannel angular pressing for the processing of ultra-fine grained materials. Scripta Materialia, 35, pp. 143–146, 1996. [Crossref]
[13] Khatibi, G., Horky, J., Weiss, B. & Zehetbauer, M.J., High cycle fatigue behavior of copper deformed by high pressure torsion. International Journal of Fatigue, 32, pp. 269–278, 2010. [Crossref]
[14] Goto, M., Han, S.Z., Yakushiji, T., Lim, C.Y. & Kim, S.S., Formation process of shear bands and protrusions in ultrafine grained copper under cyclic stresses. Scripta Materialia, 54, pp. 2101–2106, 2006. [Crossref]
[15] Goto, M., Han, S.Z., Euh, K., Kang, J-H., Kim, S.S. & Kawagoishi, N., Formation of a high-cycle fatigue fracture surface and a crack growth mechanism of ultrafine grained copper with different stages of microstructural evolution. Acta Materiala, 58, pp. 6294–6305, 2010. [Crossref]
[16] Goto, M., Kamil, K., Han, S.Z., Euh, K., Kim, S.S. & Lee, J., Fatigue-induced grain coarsening and crack growth behavior in ultrafine grained copper under different loading histories. International Journal of Fatigue, 51, pp. 57–67, 2013. [Crossref]
[17] Goto, M., Han, S.Z., Yamamoto, T., Kitamura, J., Ahn, J.H., Yakushiji, T., Kim, S.S. & Lee, J., Formation mechanism of inclined fatigue-cracks in ultrafine-grained Cu processed by equal channel angular pressing. International Journal of Fatigue, 92, pp. 577–587, 2016. [Crossref]
[18] Noda, N.A. & Kagita, M., Variations of stress intensity factors of a semi-elliptical surface crack subjected to mode I, II, III loading. International Journal of Pressure Vessels Piping, 81, pp. 635–644, 2004. [Crossref]
[19] Benthem, J.P., State of stress at the vertex of crack in a half-space. International Journal of Solids and Structures, 13, pp. 479–492, 1977. [Crossref]
[20] Zhang, J.Z., A shear band decohesion model for small fatigue crack growth in an ultrafine grain aluminium alloy. Engineering Fracture Mechanics, 65, pp. 665–681, 2000. [Crossref]
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Open Access
Research article

Relationship Between Shear Plane of the Final Pressing and Fatigue Crack Growth Behaviour of Round-Bar Specimens of Cu Processed by ECAP

Masahiro Goto1,
Takaei Yamamoto1,
Seung Zeon Han2,
Jee Hyuk Ahn2,
Junichi Kitamura1,
Kusno Kamil3,
Terutoshi Yakushiji4,
Toshiki Masuda1,
Takashi Iwamura1,
Sangshik Kim5
1
Department of Mechanical Engineering, Oita University, Oita, Japan
2
Korea Institute of Materials Science, Changwon, Republic of Korea
3
Universitas Muslim Indonesia, Makassar, Indonesia
4
National Institute of Technology, Oita College, Oita, Japan
5
Gyeongsang National University, Chinju, Republic of Korea
International Journal of Computational Methods and Experimental Measurements
|
Volume 6, Issue 4, 2018
|
Pages 691-702
Received: N/A,
Revised: N/A,
Accepted: N/A,
Available online: N/A
View Full Article|Download PDF

Abstract:

The formation mechanism of inclined fatigue cracks in ultrafine-grained Cu processed by equal channel angular pressing was studied by using a smooth specimen with a small blind hole. The crack growth direction depended on the location of drilling hole along the circumferential direction of the round bar specimen and on the applied stress amplitudes. Although the low-cycle fatigue crack growth paths inclined 45° and 90° to the loading-axis were observed in the different locations on the surface, crack faces in these cracks were extended along one set of maximum shear stress planes, corresponding to the shear plane of the final processing. To study the crack growth behaviour, surface damage around the crack paths formed by the two-step fatigue stress tests was observed. Profile of crack face was examined, showing the aspect ratios (b/a) of b/a = 0.38 and 1.10 for the cracks with 45° and 90° inclined path directions with respect to the loading axis, respectively. The role of the microstructure and deformation mode at the crack-tip areas on the formation of crack paths parallel to the shear plane of the final pressing was discussed in terms of the microstructural evolution caused by cyclic stressing and the mixed-mode stress intensity factor.

Keywords: Copper, Crack propagation, Equal channel angular pressing, Fatigue
Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

References
[1] Segal, V.M., Materials processing by simple shear. Materials Science & Engineering: A, 197, pp. 157–164, 1995. [Crossref]
[2] Valiev, R.Z., Structure and mechanical properties of ultrafine-grained metals. Materials Science & Engineering: A, 234–236, pp. 59–66, 1997. [Crossref]
[3] Agnew, S.R. & Weertman, J.R., Cyclic softening of ultrafine grain copper. Materials Science & Engineering: A, 244, pp. 145–153, 1998. [Crossref]
[4] Vinogradov, A. & Hashimoto, S., Multiscale phenomena in fatigue of ultra-fine grain materials-an overview. Materials Transactions, 42, pp. 74–84, 2000. [Crossref]
[5] Brebbia, C.A., Telles, J.C.F. & Wrobel, L.C., (eds), Boundary Element Techniques, Springer-Verlag: Berlin and New York, pp. 11–13, 1984.
[6] Höppel, H.W., Zhou, Z.M., Mughrabi, H. & Valiev, R.Z., Microstructural study of the parameters governing coarsening and cyclic softening in fatigued ultrafine-grained copper. Philosophical Magazine -A, 82, pp. 1781–1794, 2002. [Crossref]
[7] Wu, S.D., Wang, Z.G., Jiang, C.B., Li, G.Y., Alexandrov, I.V. & Valiev, R.Z., The formation of PSB-like shear bands in cyclically deformed ultrafine grained copper processed by ECAP. Scripta Materiala, 48, pp. 1605–1609, 2003. [Crossref]
[8] Kunz, L., Lukáš, P. & Svpboda, M., Fatigue strength, microstructural stability and strain localization in ultrafine-grained copper. Materials Science & Engineering: A, 434, pp. 97–104, 2006. [Crossref]
[9] Fang, D., Zhang, P., Duan, Q., Wu, S., Zhang, Z., Li, J. & Zhao, N., Fatigue behavior of Al-Cu alloy subjected to different number of ECAP passes. Advanced Engineering Materilas, 9, pp. 860–866, 2007. [Crossref]
[10] Zhang, Z.F., Wu, D.S., Li, Y.J., Liu, S.M. & Wang, Z.G., Cyclic deformation and fatigue properties of Al–0.7 wt. % Cu alloy produced by equal channel angular pressing. Materials Science & Engineering, A, 412, pp. 279–286, 2005. [Crossref]
[11] Goto, M., Han, S.Z., Ahn, J.H., Yakushiji, T., Euh, K., Kim, S.S. & Lee, J., The role of mixed-mode deformation at the crack tip on shear banding and crack propagation of ultrafine-grained copper. International Journal of Fatigue, 66, pp. 220–228, 2014. [Crossref]
[12] Iwahashi, Y., Wang, J., Horita, Z., Nemoto, M. & Langdon, T.G., Principle of equalchannel angular pressing for the processing of ultra-fine grained materials. Scripta Materialia, 35, pp. 143–146, 1996. [Crossref]
[13] Khatibi, G., Horky, J., Weiss, B. & Zehetbauer, M.J., High cycle fatigue behavior of copper deformed by high pressure torsion. International Journal of Fatigue, 32, pp. 269–278, 2010. [Crossref]
[14] Goto, M., Han, S.Z., Yakushiji, T., Lim, C.Y. & Kim, S.S., Formation process of shear bands and protrusions in ultrafine grained copper under cyclic stresses. Scripta Materialia, 54, pp. 2101–2106, 2006. [Crossref]
[15] Goto, M., Han, S.Z., Euh, K., Kang, J-H., Kim, S.S. & Kawagoishi, N., Formation of a high-cycle fatigue fracture surface and a crack growth mechanism of ultrafine grained copper with different stages of microstructural evolution. Acta Materiala, 58, pp. 6294–6305, 2010. [Crossref]
[16] Goto, M., Kamil, K., Han, S.Z., Euh, K., Kim, S.S. & Lee, J., Fatigue-induced grain coarsening and crack growth behavior in ultrafine grained copper under different loading histories. International Journal of Fatigue, 51, pp. 57–67, 2013. [Crossref]
[17] Goto, M., Han, S.Z., Yamamoto, T., Kitamura, J., Ahn, J.H., Yakushiji, T., Kim, S.S. & Lee, J., Formation mechanism of inclined fatigue-cracks in ultrafine-grained Cu processed by equal channel angular pressing. International Journal of Fatigue, 92, pp. 577–587, 2016. [Crossref]
[18] Noda, N.A. & Kagita, M., Variations of stress intensity factors of a semi-elliptical surface crack subjected to mode I, II, III loading. International Journal of Pressure Vessels Piping, 81, pp. 635–644, 2004. [Crossref]
[19] Benthem, J.P., State of stress at the vertex of crack in a half-space. International Journal of Solids and Structures, 13, pp. 479–492, 1977. [Crossref]
[20] Zhang, J.Z., A shear band decohesion model for small fatigue crack growth in an ultrafine grain aluminium alloy. Engineering Fracture Mechanics, 65, pp. 665–681, 2000. [Crossref]
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Goto, M., Yamamoto, T., Han, S. Z., Ahn, J. H., Kitamura, J., Kamil, K., Yakushiji, T., Masuda, T., Iwamura, T., & Kim, S. (2018). Relationship Between Shear Plane of the Final Pressing and Fatigue Crack Growth Behaviour of Round-Bar Specimens of Cu Processed by ECAP. Int. J. Comput. Methods Exp. Meas., 6(4), 691-702. https://doi.org/10.2495/CMEM-V6-N4-691-702
M. Goto, T. Yamamoto, S. Z. Han, J. H. Ahn, J. Kitamura, K. Kamil, T. Yakushiji, T. Masuda, T. Iwamura, and S. Kim, "Relationship Between Shear Plane of the Final Pressing and Fatigue Crack Growth Behaviour of Round-Bar Specimens of Cu Processed by ECAP," Int. J. Comput. Methods Exp. Meas., vol. 6, no. 4, pp. 691-702, 2018. https://doi.org/10.2495/CMEM-V6-N4-691-702
@research-article{Goto2018RelationshipBS,
title={Relationship Between Shear Plane of the Final Pressing and Fatigue Crack Growth Behaviour of Round-Bar Specimens of Cu Processed by ECAP},
author={Masahiro Goto and Takaei Yamamoto and Seung Zeon Han and Jee Hyuk Ahn and Junichi Kitamura and Kusno Kamil and Terutoshi Yakushiji and Toshiki Masuda and Takashi Iwamura and Sangshik Kim},
journal={International Journal of Computational Methods and Experimental Measurements},
year={2018},
page={691-702},
doi={https://doi.org/10.2495/CMEM-V6-N4-691-702}
}
Masahiro Goto, et al. "Relationship Between Shear Plane of the Final Pressing and Fatigue Crack Growth Behaviour of Round-Bar Specimens of Cu Processed by ECAP." International Journal of Computational Methods and Experimental Measurements, v 6, pp 691-702. doi: https://doi.org/10.2495/CMEM-V6-N4-691-702
Masahiro Goto, Takaei Yamamoto, Seung Zeon Han, Jee Hyuk Ahn, Junichi Kitamura, Kusno Kamil, Terutoshi Yakushiji, Toshiki Masuda, Takashi Iwamura and Sangshik Kim. "Relationship Between Shear Plane of the Final Pressing and Fatigue Crack Growth Behaviour of Round-Bar Specimens of Cu Processed by ECAP." International Journal of Computational Methods and Experimental Measurements, 6, (2018): 691-702. doi: https://doi.org/10.2495/CMEM-V6-N4-691-702
GOTO M， YAMAMOTO T， HAN S Z， et al. Relationship Between Shear Plane of the Final Pressing and Fatigue Crack Growth Behaviour of Round-Bar Specimens of Cu Processed by ECAP[J]. International Journal of Computational Methods and Experimental Measurements， 2018， 6(4)： 691-702. https://doi.org/10.2495/CMEM-V6-N4-691-702