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APPLICATION OF ENERGY DISSIPATION RATE ARGUMENTS TO DUCTILE INSTABILITY
Author(s) -
Kolednik O.,
Turner C. E.
Publication year - 1994
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1994.tb01403.x
Subject(s) - dissipation , plasticity , instability , materials science , brittleness , fracture toughness , mechanics , strain energy release rate , fracture (geology) , toughness , fracture mechanics , composite material , thermodynamics , physics
— Equations are established for the final macro‐unstable behaviour of a fully plastic cracked component in terms of the energy dissipation rate. Control by this first differential of energy occurs when the second differential of the energy absorbed is negative, a condition easily met for crack growth in certain fully plastic cases. The driving force for the instability is a term, I that becomes greater than the lefm term, G , as plasticity occurs. The additional component is an exchange of elastic to plastic energy, a term that is system dependent and is thus the main driving force for a fully plastic ductile instability. A possible relevance to brittle fracture and to a system dependence of both initiation toughness and the whole crack growth resistance curve is discussed.