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Moyseychik E.A., Candidate of Technical Sciences, Associate Professor of the Department "Strength of Materials and Elasticity Theory", Belarusian National Technical University, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.

Year 2011 Issue 4 Pages 80-86
Type of article RAR Index UDK 620.17 Index BBK  
Abstract In the article on the basis of experimental data to investigate the mechanism of nucleation and crack development in the vicinity of defects in static tensile sheet elements of mild steel. It is shown that the destruction is initiated by the initial crack of a parabolic shape, emerging from defects in design-technological origin. Based on the correlations found that the shape and size of the initial cracks are determined by the volume of plastically deformed material at the base of the defect and the physical and chemical processes taking place in this volume. By using infrared heat deformation shows that the material of a deformable element for loading the formation of blocks with different stress-strain state. It is suggested that the development of initial cracks in elastically strained unit determines its brittle fracture and crack propagation along the trajectories of maximum shear stress leads to ductile fracture specimen.

static stretching, crack, loading, stress-strain state, low-carbon steel

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