Download PDF by G. Pluvinage: Fracture and Fatigue Emanating from Stress Concentrators

By G. Pluvinage

A overwhelming majority of disasters emanate from pressure concentrators comparable to geometrical discontinuities. The position of rigidity focus was once first highlighted by way of Inglis (1912) who supplies a pressure focus issue for an elliptical disorder, and later through Neuber (1936). With the development in computing, it truly is now attainable to compute the genuine rigidity distribution at a notch tip. This distribution isn't easy, yet appears like pseudo-singularity as in precept the ability dependence with distance continues to be. This distribution is ruled by means of the notch pressure depth issue that is the foundation of Notch Fracture Mechanics. Notch Fracture Mechanics is linked to the volumetric strategy which postulates that fracture calls for a actual quantity. in view that fatigue additionally wishes a actual method quantity, Notch Fracture Mechanics can simply be prolonged to fatigue emanating from a rigidity concentration.

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P. ’Elastic field equations for blunt cracks with reference to stress corrosion cracking’. 4 Chen. (C. 5 Usami. , (1985). ‘Short crack fatigue properties and component life estimation’. Current Research on Fatigue Crack, Edited by Tanaka. ; The Society of Materials Sciences, Kyoto, Japan. 6 Glinka. , Newport. , (1987). ’ International Journal of Fatigue, Vol. 9, N° 3, , July, pp 143~150. 7 Kujawski. ’Estimation of stress intensity factor for small cracks at notches’. Fatigue Fracture Materials and Structures, Vol.

71) D. 14]. n. 72) U ¹¬ V0 © © U ¹¼ C is a constant which depend of the strain hardening exponent. 73) I Hpef, the plastic effective strain at the notch root depend on the strain hardening exponent. 14. We can see that the maximum stress is not at the notch tip in this case. 15]. n. n. r U . dr rU . 75) 0 This formula overestimates the stress distribution compared to the Finite Element method. 76) §H ln¨¨ p ef © Hp with H n · ¸¸ and I = 0,85 . n. r U . 1 + Ln 1 + r U 0 < r < RE . 16] The stress distribution at the notch tip for an elastoplastic material has been computed using Finite Element method.

Oxford University Press. 12 Wilshaw. T. , Rau. C. , Tetelman. , (1968). ” Engineering Fracture Mechanics, Vol. 1, pp 191~211. 13 Tetelman. A. , McEvilly. , (1967). ’ John Wiley and Sons. 14 Xu. R. , Thompson. , Topper. T. , (1995). ‘Practical stress expressions for stress concentration regions’. Fatigue and Fracture of Engineering Materials and Structures, Vol. 18, N° 718, pp 885~895. 15 Lin K. , Pin. , (1980). ‘Singular finite elements for the fracture analysis of V notched plates’. International Journal for Numerical Methods in Engineering, Vol.

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