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Numerical Simulation on Fracture Formation on Surfaces of Bi-Layered Materials

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Abstract:

Fracture formation on surfaces of bi-layered materials is studied numerically. A simplified two-layered materials model like growing tree trunk is present. This work is focused on patterns of fractures and fracture saturation. We consider the formation of crack pattern in bark as an example of pattern formation due to expansion of one material layer with respect to another. As a result of this expansion, the bark stretches until it reaches its limit of deformation and cracks. A novel numerical code, 3D Realistic Failure Process Analysis code (abbreviated as RFPA3D) is used to obtain numerical solutions. In this numerical code, the heterogeneity of materials is taken into account by assigning different properties to the individual elements according to statistical distribution function. Elastic-brittle constitutive relation with residual strength for elements and a Mohr-Coulomb criterion with a tensile cut-off are adopted so that the elements may fail either in shear or in tension. The discontinuity feature of the initiated crack is automatically induced by using degraded stiffness approach when the tensile strain of the failed elements reaching a certain value. The different patterns are obtained by varying simulation parameters, the thickness of the material layer. Numerical simulation clearly demonstrates that the stress state transition precludes further infilling of fractures and the fracture spacing reaches constant state,i.e. the socalled fracture saturation. It also indicates that RFPA code is a viable tool for modeling fracture formation and studying fracture patterns.

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Periodical:

Key Engineering Materials (Volumes 353-358)

Pages:

993-996

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.993

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Online since:

September 2007

Authors:

Tian Hui Ma, Ju Ying Yang, Zheng Zhao Liang, Yong Bin Zhang, Tao Xu

Keywords:

Fracture Pattern, Fracture Saturation, Numerical Simulation, RFPA

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] B. N. Whittaker, P. Gaskll and D. J. Reddish: Min. Sci. Technol. Vol. 10(1990), p.71.

Google Scholar

[2] J. A. Romberger, Z. Hejnowicz and J. F. Hill: Plant Struct. Funct. Develop. Springer-Verlag, (1993).

Google Scholar

[3] C. A. Tang, Z. Z. Liang, Y. B. Zhang and T. Xu: Key Eng. Mater. Vol. 297-300(2005), p.1196.

Google Scholar

[4] L. C. Zhang: Solid Mech. Eng., Palgrave, (2001).

Google Scholar

[5] P. Neger,D. Steglich and W. Brocks: Int. J. Fract. Vol. 134 (2005), p.209.

Google Scholar

[6] C. A. Tang and S. Q. Kou: Eng. Fract. Mech. Vol. 61(1998), p.311.

Google Scholar

[7] P. Federl and P. Prusinkiewicz: Proce. Comput. Sci. ICCS, (2004).

Google Scholar

[8] D. Broek: Elementary engineering mechanics (Kluwer Academic Publisher, USA 1986).

Google Scholar

[9] Z. Z. Liang, C. A. Tang, D. S. Zhao, Y. B. Zhang, T. Xu and H. Q. Zhang: Key Eng. Mater. Vol. 297-300(2005), p.1113.

Google Scholar

[10] T. H. Ma, C. A. Tang, T. Xu and Z. Z. Liang: Key Eng. Mater. Vol. 324-325 (2006) p.931.

Google Scholar

[11] S. H. Wang, H. R. Sun, T. Xu, T.H. Yang and E. D. Wang: Key Eng. Mater. Vol. 297-300(2005), p.2612.

Google Scholar