Load range influence of a short propagating edge crack using the discrete dislocation technique

• Autorzy: Hansson P. , Melin S.
• Konferencja: Konferencja mechaniki pękania / sympozjum (X ; 11-14.09.2005 ; Opole-Wisła, Polska)
• Języki publikacji: EN

Abstrakty

EN

The influence of different load cycles on the growth of a short edge crack has been studied using a discrete dislocation technique. The external boundary is modeled with dislocation dipole elements and the plasticity is modeled by discrete dislocations. The crack is located within one grain in a bcc material, and is assumed to grow through a single shear mechanism, due to nucleation and annihilation of discrete dislocations along preferred slip planes. It was found that the applied maximum load in the cycle strongly affected the growth behavior of the crack, both in the case of constant minimum load and the case of constant load range.

Słowa kluczowe

EN

edge crack; discrete dislocation technique

• Wydawca: Oficyna Wydawnicza Politechniki Opolskiej
• Czasopismo: Zeszyty Naukowe. Mechanika / Politechnika Opolska
• Rocznik: 2005
• Tom: z. 82
• Strony: 107--114
• Opis fizyczny: Bibliogr. 11 poz., rys., tab., wykr.

Twórcy

autor

Hansson P.

• Lund University, Sweden

autor

Melin S.

• Lund University, Sweden

Bibliografia

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• [3] ZHANG J.Z.: A shear band decohesion model for small fatigue crack growth in an ultra-fine grain aluminium alloy. Engineering Fracture Mechanics, 65:665-681, 2000.
• [4] RIEMELMOSER F.O., PIPPAN R., KOLĘDNIK O.: Cyclic crack growth in elastic plastic solids: a description in terms of dislocation theory. Computational Mechanics, 20:139-144, 1997.
• [5] RIEMELMOSER F.O., PIPPAN R.: Mechanical reasons for plasticity-induced crack closure under plane strain conditions. Fatigue & Fracture of Engineering Materials & Structures, 21:1425-1433, 1998.
• [6] BJERKEN C, MELIN S.: A tool to model short crack growth using a discrete dislocation formulation. Int Jnl of Fatigue, 25(6):559-566, 2003.
• [7] BJERKEN C, MELIN S.: A study of the influence of grain boundaries on short crack growth during varying load using a dislocation technique. Engineering Fracture Mechanics, 71(15):2215-2227, 2004.
• [8] HANSSON P., MELIN S.: Dislocation-based modeling of the growth of a microstructurally short crack by single shear due to fatigue loading. Int Jnl of Fatigue, 27:347-356, 2005.
• [9] HILLS D.A., KELLY P.A., DAI D.N.,KORSUNSKY A.M.: Solution of Crack problems: The distributed dislocation technique. Kluwer Academic Publisher, 1996.
• [10] ASKELAND D.R.: The Science and Engineering of Materials, third edition. Stanley Thornes (Publishers) Ltd, 1998.
• [11] HULL D., BACON D.J.: Hull, D. and Bacon, D, J. Introduction to Dislocations, fourth edition. Butterworth-Heinemann, 2001.