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Mechanical Engineering Technologies
ArticleName Analysis of the stress-strain state when knurling riffles in a steel cylindrical shell
DOI 10.17580/chm.2022.04.11
ArticleAuthor V. D. Kukhar, V. A. Korotkov, S. S. Yakovlev, A. A. Shishkina

Tula State University, Tula, Russia:
V. D. Kukhar, Dr. Eng., Professor, Head of the Dept. of Theoretical Mechanics
V. A. Korotkov, Cand. Eng., Associate Professor, Dept. of Mechanics of Plastic Forming
S. S. Yakovlev, Postgraduated Student, Dept. of Mechanics of Plastic Formings, e-mail:
A. A. Shishkina, Student, Dept. of Labour and Environment Protection


Obtaining shells with riffling inner surface is a complex and urgent task, therefore, a new riffling method has been developed, which is characterized by high efficiency and low metal consumption of the structure relative to existing ones. At the same time, there are practically no works devoted to the assessment and study of stresses, deformations, and material damage when knurling by local form change. The paper analyzes the intensity of deformations, average stresses and the risk of destruction when knurling the inner surface of the shell during local shaping using tools that have different-shaped lead-in parts of the wedge protrusions. A comparative analysis of the stress-strain state is performed for various methods of knurling in one direction – local shaping and reduction through a conical matrix. The study was carried out in order to determine the most appropriate method of knurling in terms of obtaining the favorable stress-strain state. The stress-strain state when knurling of the opposite direction in the zone of their intersection in the process of forming a mesh of riffles by local shaping is also considered. To solve the problem, computer simulation was carried out in the DEFORM program with subsequent interpretation of the results.
The work was carried out within the framework of the grant of the Government of the Tula region in the field of science and technology No. DS/167.

keywords Knurling, mesh of riffles, local deformation, steel, stress intensity, cylindrical shell, deformation intensity, wedge protrusions, gap size

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