Deformation of laboratory truncated disc samples with stress concentrators


Аuthors

Tsvik L. B.*, Zenkov E. V.**, Malomigev D. O.***

Irkutsk National Research Technical University, 83, Lermontov str., Irkutsk, 664074, Russia

*e-mail: tsvik_l@mail.ru
**e-mail: jovanny1@yandex.ru
***e-mail: kbprf13@gmail.com

Abstract

The article assesses the structural strength of sample materials destroyed on standard single-drive testing machines. The stress-strain state (SSS) of laboratory truncated circular disk samples with stress concentrators in the form of grooves was analyzed. It was revealed that the disc truncation along the two symmetrical chords allows for varying the type of SSS (the ratio of principal stresses) in the sample and intensity of stresses in the working zone. The problems of the linear theory of elasticity were solved for samples with different degrees of disc truncation and with different geometric parameters of the groove profile. The computational experiment shows that in the studied range of dimensionless values of the geometric parameters (relative curvature of the groove surface, relative depth of the groove and the degree of truncation of the sample disk), the type coefficient of the stress-strain state P and the stress concentration coefficient Kσ change in the intervals 0 ≤ P ≤ 2 and Kσ < 4. If necessary, concentrating grooves can be located on the loading surface of the samples under consideration, which makes it possible to study the behavior of various materials under conditions of biaxial compression. The analysis of disk deformation showed that these laboratory samples can be used in simulating the type and level of stress-strain state of various structural elements of machines and mechanisms, including highly loaded elements of aircraft and engines used in rocket and space technology. This factor significantly expands the possibilities for assessing the structural strength of materials during laboratory studies of the materials. It was revealed that the type of SSS plays a role in localizing the sources of destruction of highly loaded structural elements made from structural carbon steel St45. The results can be used both for the experimental assessment of the structural strength of materials and for constructing limit state equations corresponding to a SSS level and type.

Keywords:

laboratory sample, stress-strain state, structural strength, computational modeling, variant studies, localization of the source of destruction

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