Abstract
The equilibrium, path-independent J-integral is commonly interpreted as the rate of decrease in the potential energy of an elastic body, containing a crack, per unit area of the new surface created by crack extension. Such an interpretation encounters difficulties. The correct, contradiction-free description of the energy-release rate is the approach based on the dynamic energy flow into the crack tip. As a corollary, it leads to the correct quasistatic criteria for brittle-fracture propagation.
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