Abstract
Experimental confirmation is presented for a previously obtained, theoretical relationship between the size of the failure-process zone and the total strain-energy density (SED) in dimensionless form for conditions of mixed failure modes under static and cyclic deformation. Characteristic features of subcritical crack growth are delineated for static deformation as a function of type of steel structure. Familiar literature data on the ductile-brittle transition are described, and an equation proposed for calculation of fracture toughness on the basis of standard mechanical properties of materials. Both constraint and scale effects are analyzed for failure under plane stress and plane strain within the framework of the theory under development. Characteristics of cyclic crack growth are compared with fractography data on the fatigue-stria step. It is demonstrated that the results of static and fatigue experiments for steel in different structural compositions lie on one curve common for a given specimen geometry.
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