Stress intensity factors and crack propagation path under mixed mode conditions

Document Type : Original Article

Authors

1 MSc student, Civil Engineering Department, Islamic Azad University of Qazvin, Qazvin, Iran

2 Professor, Department of Civil Engineering, Sharif University of Technology, Tehran, Iran

Abstract

Use of crack propagation principles based on SIFs (stress intensity factors) is among the most common methods of fracture mechanic engineering. SIF is an important parameter in fracture analysis. In analyzing elastic fracture, SIF reveals the stress near the crack tip and substantial information about crack propagation. When loading or geometry of a structure is not symmetrical around a crack, rupture occurs with combined loading and the crack does not propagate on a straight line. Therefore, to determine the new direction of facture propagation use of twist angle criteria is necessary. The objective of this research was to propose a numerical model of crack propagation under combined loading conditions. In each crack with increased length the twist angle is assessed as a function of SIFs. This research aimed to determine SIFs for the crack propagation problem and to determine the crack development path through linear elastic fracture analysis. This study was primarily based on examination of the propagation and development of cracks on a plane under tensile loading and combined mode loading conditions. The ANSYS finite element software and FRANC3D crack propagation software were used to simulate crack propagation and to calculate the stress and SIFs

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References

[1] Journet, B., Ohrloff, N., Pavlou, D., Pantelakis, S., Scra, L., Poole, D., Smart, J. (1993). Investigation on Al-Li Alloys for Damage Tolerant Applications. B/E3250 project, task 4 (Flight Simulation), Final Report DCR/M-60365/F-93, AEROSPATIALE, Suresnes.
[2] Pavlou, D.G. (2000). Prediction of fatigue crack growth under real stress histories, Engineering Structures, vol. 22, no. 12, p. 1707-1713, DOI:10.1016/S0141- 0296(99)00069-3.
[3] Paris, P.C., Erdogan, F. (1963). A critical analysis of crack propagation Laws. Transaction ASME, Journal of Basic Engineering, vol. 85, no. 4, p. 528-533 ,DOI:10.1115/1.3656900.
[4] Erdogan, F., Sih, G.C. (1963). On the crack extension in plates under plane loading and transverse shear. Transaction ASME, Journal of Basic Engineering, vol.85, p. 519-525, DOI:10.1115/1.3656897.
[5] Petrašinović, D., Boško, R., Petrašinovic, N. (2012). Extended finite element method (XFEM) applied to aircraft duralumin spar fatigue life estimation. Tehnički vjesnik – Technical Gazzete, vol. 19, no. 3, p. 557-562.
[6] Marija Blažiæ – Stevan Maksimoviæ – Zlatko Petroviæ – Ivana Vasoviæ – Dragana Turniæ-Determination of Fatigue Crack Growth Trajectory and Residual Life under Mixed Modes-Strojniški vestnik - Journal of Mechanical Engineering 60(2014)4, 250-254.
]7[ محمد رضا اصفهانی،١٣٨٦, مکانیک شکست بتن، ناشر: دانشگاه صنعتی امیرکبیرنویسنده، ویرایش اول, چاپ اول.
]8[  رحمت‌ا... قاجار ، مکانیک شکست و خستگی،1388، انتشارات: دانشگاه صنعتی خواجه نصیرالدین طوسی.
]9[  اس ا مگید،1387، مکانیک شکست ، مترجم دکتر غلامحسین فرهی، ناشر : دانشگاه بو علی سینا، ویرایش اول, چاپ سوم.
]10[ احسان سوایی،1390،آنالیز مکانیک جامدات با انسیس 12 ،انتشارات نشر سیمرغ.
Journal of Structural and Construction Engineering
Volume 3, Issue 3 - Serial Number 8
December 2016
Pages 86-96

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History

  • Receive Date: 25 April 2016
  • Revise Date: 04 November 2016
  • Accept Date: 30 November 2016

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