Experimental Determination and Numerical Calculation of Fracture Viscosity Criterion (J-integral)

Abstract

The paper shows that it is necessary to accept energy J-integral criterion as a criterion of fracture viscosity under conditions when the zone of plasticity is rather large at crack top. Numerical modeling of fracture process has shown good convergence with experimental investigations of J-integral parameter. Values of J-integral for 38ХНЗМФА steel, ЭП-131 cobalt alloy, MT molybdenum alloy have been experimentally determined. It is revealed that high-velocity deformation at explosive steel processing forms structure with high parameters of fracture viscosity and significant increase in material yield strength.