Abstract
The work is devoted to the experimental study of mechanical behavior regularities of the structural steel 40Cr under postcritical deformation of specimens in conditions of strain localization formation in the form of neck during extension. The results of testing specimens cut from the initial samples with a neck are given. Various levels of preliminary postcritical deformation of initial samples are implemented. Using a noncontact 3D video system for recording displacement and strain fields of Vic 3D Correlated Solutions, based on the digital images correlation technique, the displacement and strain fields in the gauge length of both the original specimens with the neck and after the groove were recorded in two different schemes to eliminate geometrical heterogeneity. On the base of obtained results, the stiffness and strength of 40Cr steel were evaluated in a necked specimen at various stages of postcritical deformation. It is shown that the material in the peripheral areas of the gauge length of the sample is in a strengthened state, which does not depend on the degree of previously achieved postcritical deformation, and the strength of the material in the neck-forming zone on the initial specimens is thereby increased.
Highlights
C urrently, the attention of a large number of researchers is aimed at studying various aspects of deformation processes, accumulation of damages and destruction of structural materials
The aim of the presented work is an experimental study of the mechanical behavior regularities of structural steels during postcritical deformation of specimens under the conditions of the strain localization formation in the neck form at tension
Particular attention is paid to the registration and interpretation of experimental data in the context of the formation of the strain localization as a necking effect
Summary
C urrently, the attention of a large number of researchers is aimed at studying various aspects of deformation processes, accumulation of damages and destruction of structural materials. The material deformation at the postcritical stage of deformation is accompanied by actively proceeding plasticity processes and in most cases leads to the localization of strain as a necking effect in the gauge length of the specimen This effect in the test significantly complicates the registration, processing and interpretation of the experimental data [7,8,9,10]. In [16,17,18,19], methodological issues of testing were considered and experimental data of postcritical behavior of structural steels and alloys under various types of stress-strain state and temperatures were obtained. The aim of the presented work is an experimental study of the mechanical behavior regularities of structural steels during postcritical deformation of specimens under the conditions of the strain localization formation in the neck form at tension. Features description of the mathematical aspects of the video system, based on digital image correlation technique, as well as methodological aspects of the system application for solving problems related to solid mechanics is given in the following works [25, 26]
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