On constructing the theory of ductile fracture near friction surfaces |
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Authors: | S E Alexandrov E A Lyamina |
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Institution: | 1.Ishlinskii Institute for Problems in Mechanics,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | A criterion of ductile fracture is proposed, which takes into account the singular character of theoretical solutions near
the maximum friction surfaces and the emergence of a thin layer with intense plastic strains near surfaces with high friction
stresses in real processes of metal forming. The equation for the thickness of the layer with intense plastic strains and
the fracture criterion include the strain rate intensity factor, apparently, characterizing the intensity of physical processes
that occur in a thin material layer near the friction surfaces. Some experimental data are used to determine the thickness
of this layer. The ductile fracture criterion is analyzed by solving the problem of strip extrusion under conditions of plane
strain deformation. |
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