Energy balance considerations during stable crack growth

Raju, KN (1979) Energy balance considerations during stable crack growth. In: Proceedings of the International Conference on Fracture Mechanics in Engineering Application, 26-30 Mar 1979, Bangalore, India.

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Abstract

An expression for plastic energy dissipation rate during stable crack growth is obtained in terms of four integrals by an approximate analysis. It is shown that the plastic energy dissipation rate can be expressed as the sum of two of these integrals without serious error. An expression for plastic energy dissipation rate in the case of stationary crack in an infinite sheet with a central crack under increasing uniform stress has been obtained by a similar analysis. Energy release rates for a stationary crack with growing plastic enclaves under increasing stress and for a crack growing in a stable fashion have been obtained using an energetic interpretation of plastic zone correction. Energy balance equations governing conditions prior to crack extension and during stable crack growth have been set up. Using critical energy absorbed in the fracture process zone (FPZ) as a criterion for crack extension, an equation is derived for stable crack growth. This has been numerically solved to obtain stable crack growth curves.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Crack propagation;Energy dissipation;Energy methods;Fracture mechanics;Plastic properties;Thin plates;Approximation; Integral equations;Mathematical models;Plastic deformation; Rates(Per time);Stress analysis;Stress distribution
Subjects: AERONAUTICS > Aeronautics (General)
Division/Department: Materials Science Division
Depositing User: M/S ICAST NAL
Date Deposited: 01 Dec 2006
Last Modified: 24 May 2010 09:53
URI: http://nal-ir.nal.res.in/id/eprint/3577

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