O. Kolednik et Ce. Turner, APPLICATION OF ENERGY-DISSIPATION RATE ARGUMENTS TO DUCTILE INSTABILITY, Fatigue & fracture of engineering materials & structures, 17(10), 1994, pp. 1129-1145
Equations are established for the final macro-unstable behaviour of a
fully plastic cracked component in terms of the energy dissipation rat
e. Control by this first differential of energy occurs when the second
differential of the energy absorbed is negative, a condition easily m
et for crack growth in certain fully plastic cases. The driving force
for the instability is a term, I that becomes greater than the lefm te
rm, G, as plasticity occurs. The additional component is an exchange o
f elastic to plastic energy, a term that is system dependent and is th
us the main driving force for a fully plastic ductile instability. A p
ossible relevance to brittle fracture and to a system dependence of bo
th initiation toughness and the whole crack growth resistance curve is
discussed.