Methods for an estimation of thershold values for fatique crack propagation through a bi-material interface

• Autorzy: Nahlik L.
• Konferencja: Applied Mechanics 2003, Gliwice, Polska
• Języki publikacji: EN

Abstrakty

EN

elastic materials under assumptions of linear-elastic fracture mechanics. Two procedures for the estimation of threshold values for further crack propagation from bi-material interface to the second material are suggested. One of the is related to the area of the plastic zone in front of the crack tip, while the second one is based on the Sih's strain energy density concept. Special attention is devoted to a crack perpendicularly oriented to the bi-material interface. It is shown that the corresponding fatigue threshold value is strongly influenced by the existence of an interface between the two materials. Both methods are used to quantify the threshold values of the fatigue crack propagation and simultaneously compare the relative accuracy of both approaches. On the basis of the obtained results, it seems promising to use any approach in the decision on whether the crack will stop at the interface or will continue growing into the second material.

Słowa kluczowe

EN

thershold values; atique crack propagation through; bi-material

• Wydawca: Wydawnictwo Katedry Mechaniki Stosowanej
• Czasopismo: Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
• Rocznik: 2003
• Tom: nr 21
• Strony: 179--184
• Opis fizyczny: Bibliogr. 9 poz.

Twórcy

autor

Nahlik L.

• Equipe Mecanique et Materiaux, Ecole Centrale de Lille, Cité Scientifique - BP 48 - 59651 Villeneuve d'Ascq Cedex , tel. [phone]

Bibliografia

• [1] Nahlik L., Knesl Z., Vrbka J.: Propagation of a fatigue crack through a protective layer Proceedings of Conference Surface treatment 2001, Sevilla 2001.
• [2] Nahlik L., Knesl, Z.: Estimation of the critical stress for failure of protective layers. Cl proceedings of conference Materials structure & micromechanics of fracture, Brno 2001.
• [3] Nahlik L.: Fatigue crack propagation near a bi-material interface of two elastic material: PhD Thesis, Faculty of mechanical engineering, Brno University of Technology an Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno 2002.
• [4] Fenner D.N.: Stress singularities in composite materials with an arbitrarily oriented crack meeting an interface. International Journal of Fracture, 12(5), pp. 705-721, 1976.
• [5] Lin K. Y., Mar J. W.: Finite element analysis of stress intensity factors for cracks at a bi material interface. International Journal of Fracture, 12(4), pp. 521-531, 1976.
• [6] Meguid S. A., Tan M. & Zhu Z. H.: Analysis of cracks perpendicular to bimaterial interfaces using a novel finite element. International Journal of Fracture, 73, pp. 1-23 1995.
• [7] Dundurs J.: Elastic interaction of dislocation with inhomogeneities. Mathematical theory of dislocations, The American Society of Mechanical Engineers, New York, 1969.
• [8] Sih G. C.: A special theory of crack propagation, in Mechanics of Fracture, ed. G.C.Sih Noordhoff Intern. Publishing, Leyden 1977.
• [9] Ansys Release 5.6.2. Ansys, Inc., 1999.