Dislocation-based and continuum models of crack tip shielding in fatigue

• Autorzy: Pokluda J.
• Konferencja: Conference on Fracture Mechanics (XIII ; 5-7.09.2011 ; Opole ; Polska)
• Języki publikacji: EN

Abstrakty

EN

Along with external forces and the macro-geometry of cracked bodies, the local stress intensity factors k at fronts of brittle and fatigue cracks are also determined by internal residual stress fields and the crack front mi- crogeometry (extrinsic shielding). Consequently, the values of k that represent a real crack driving force can be significantly different from those of the remote. This means that, even in the frame of two-parameter linear-elastic fracture mechanics, a characterization of the crack-tip stress field only by K and T is not sufficient at all.

Słowa kluczowe

EN

fatigue crack; fracture mechanics

• Wydawca: Oficyna Wydawnicza Politechniki Opolskiej
• Czasopismo: Zeszyty Naukowe. Mechanika / Politechnika Opolska
• Rocznik: 2011
• Tom: z. 99
• Strony: 44--45
• Opis fizyczny: Bibliogr. 7 poz.

Twórcy

autor

Pokluda J.

• Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic,

Bibliografia

• [1] POKLUDA J., ŠANDERA P., HORNÍKOVÁ J.: Statistical approach to roughness-induced shielding effects, Fat. Fract. Engng. Mater. Struct., 27, 2004, pp. 141-157
• [2] POKLUDA J., ŠANDERA P., PIPPAN R.: Analysis of crack closure level in terms of crack-wake plasticity, In: Fatigue 06, Edited by W. S. Johnson. Elsevier, Atlanta, Georgia, USA, 2006, 0107A_03
• [3] POKLUDA J., PIPPAN R.: Analysis of roughness-induced crack closure based on asymmetric crack wake plasticity and size ratio effect, Mater. Sci. Eng. A462, 2007, pp. 355-358
• [4] POKLUDA J., ŠANDERA P.: Micromechanisms of Fracture and Fa- tigue In a Multiscale Context, Springer-Verlag London Limited, UK, 2010
• [5] JAMES M.N., PACEY M.N., WEI L.W., PATTERSON E.A.: Charac- terization of plasticity-induced crack closure – crack flank contact forceversus plastic enclave, Engng. Fract. Mech. 70, 2003, pp. 2473- 2487
• [6] PACEY M.N., JAMES M.N., PATTERSON E.A.: A new photoelastic-model for studying fatigue closure, Expl. Mech. 45, 2005, pp. 42-52
• [7] CHRISTOPHER C. J., JAMES M.N., PATTERSON E.A., TEE K.F.: A quantitative evaluation of fatigue crack shielding forces using photoelas- ticity, Engng. Fract. Mech. 75, 2008, pp. 4190-4199