Author(s)

V.N. Shlyannikov

Abstract

- The strain energy density (SED) criterion is applied for analysing of the crack growth in full range of yielding. A fracture process zone (FPZ) local to the crack tip is defined and discussed in connection with the influence of the constraint effects in fracture. It can be estimated from the uniaxial mechanical properties of the material. Dimensionless constraint parameter is suggested depending on both the local elastic-plastic stress intensity and local fracture stress.According to SED- approach the above stresses are determined on the distance equal to the fracture process zone size.The relation of connection between the constraint and damage parameters is suggested. It is shown that the damage parameter to describe satisfactory the well known mechanism of ductile-brittle transition for a mild steel at a temperature change taking into account the FPZ-size.Both experimental and anal

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