Numerical Modelling of the Interaction Macro–Multimicrocracks in a Pipe under Tensile Stress

Abstract:

In this paper, the evaluation of the SIFof a macrocrack in interaction with one or several microcracks in a material containing a geometrical defect was investigated. Several configurations were considered in order to apprehend the mechanisms induced by the interaction effect and in particular the effects of reduction and/or amplification of the stress field between macro and single or multiple microcracks. The obtained results show that, macro–microcrack spacing is an important parameter if the microscopic crack is relatively close to the macrocrack-tip. The macrocrack has the tendency to accelerate as it propagates towards the microcrack. When the relative distance characterizing this spacing is higher than 0.3, the interaction effect can be neglected and the SIF remains unchanged for both defect types. When this ratio is lower than 0.3, the interaction between the two defects becomes significant and the stress intensity factor at the macrocrack tip strongly increases.

• Periodical: Advanced Materials Research (Volume 1105)
• Pages: 245-250
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1105.245
• Online since: May 2015
• Authors: Mohamed Sahnoun, Djamel Ouinas, B. Bachir Bouiadjra, J. Vina Olay, J. Vina Olay
• Keywords: Crack Interaction, Finite Element Analysis, Mixed-Mode Behavior, Notch, Stress Intensity Factor (SIF)

References

[1] Ouinas D., Bachir Bouiadjra B., Benderdouche N., Computational Materials Science 43 (2008) 1155–1159.

DOI: 10.1016/j.commatsci.2008.03.014

[2] Ouinas D., Serier B., Bachir Bouiadjra B., Achour T., Modélisation de l'effet de l'entailles dans une plaque sollicitée en traction, JUSTA, Université de Guelma, 24 et 25 Mai 2003-Algérie.

DOI: 10.1051/meca:2005064

[3] Hoagland, R. G., Hahn, G. T. and Rosenfiend, A.R., Influence on microstructure on the fracture propagation in roch. Roc. Mech. (1973) 5, 77-10.

[4] Claussen, N., Fracture toughness of Al2O3 with an unstabilized ZrC2 dispersed phase. J. Am. Ceram. Soc. 59 (1976) 49-51.

[5] Laures, J.P. and Kachanov,M., Three. International Journal of Fracture 48, (1991) 255–279.

[6] Kachanov M., Elastic solids with many cracks and related problems. In: J.W. Hutchinson, T.Y. Wu (eds) Advances in Applied Mechanics vol 30, (1993) p.259–445.

DOI: 10.1016/s0065-2156(08)70176-5

[7] Tamuzs, V.P.; Petrova, V.E. On macrocrack-microdefect interaction. Int. Appl. Mech. 38 (2002) No. 10, 1157-1177.

[8] Bachir Bouiadjra B., Benguediab M., Elmeguenni M., Belhouari M., Serier B., Ait Abdel Aziz M., Computational Materials Science 42 (2008) 100–106.

DOI: 10.1016/j.commatsci.2007.06.012

[9] Chen D.H., Nakamichi S., Int. J. Fracture 82 (1996) 131–152.

[10] Melander A., Int. J. Fatigue 19 (1997) 13–24.

[11] Schive J., Fatigue Engng. Mater. Struct. 5 (1982) 77–90.

[12] Glinka G., Engng. Fract. Mech. 22 (1983) 839–845.

[13] Kujawski D., Fatigue Fract., Engng. Mater. Struct. 14 (1991) 953–965.

[14] Lukas P., Engng. Fract. Mech. 26 (1987) 471–473.

[15] J.C. Newman Jr, Phillips E.P., R.A. Everett Jr, Mech. Mat. Branch, NASA Langley Research Center Hampton, Virginia USA, 23681, NASA/TM-1999-209329.

[16] ABAQUS Finite Element Program, ABAQUS/Standard 6. 7. 1. Hibbit, Karlsson and Sorensen, Inc. Pawtuket, USA, (2006).

[17] Henshel RD, Shaw KG., Crack tip finite elements are unnecessary. Int J. Num. Meth. Eng 9 (1975) 495-507.

[18] Ouinas D., Bachir Bouiadjra B., Benderdouche N., Computational Materials Science 43 (2008) 1155–1159.

DOI: 10.1016/j.commatsci.2008.03.014