Characteristics of the stress-strain state and structural changes in axisymmetric samples under sign-alternating deformation by free and constrained bending

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10405691" target="_blank" >RIV/00216208:11320/19:10405691 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=1eB1pUpJ-8" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=1eB1pUpJ-8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22226/2410-3535-2019-4-494-498" target="_blank" >10.22226/2410-3535-2019-4-494-498</a>

Result language

angličtina

Original language name

Characteristics of the stress-strain state and structural changes in axisymmetric samples under sign-alternating deformation by free and constrained bending

Original language description

The paper presents the results of computer modeling and experimental studies of the parameters of the stress-strain state and structure of the material during deformation by the method of alternating multi-cycle bending of a long-length workpiece (bar, wire rod) around a rotating roller in free and constrained conditions. The material for the study was long-length rods of low alloyed bronze for electrical applications - the Cu-0.5%Cr alloy. It was found that after 4 bending cycles with the workpiece turning through 90 degrees around the longitudinal axis, a gradient field of accumulated strain with maximum values in the peripheral region and minimum in the central region of the workpiece is formed in the workpiece before each subsequent processing cycle. Accordingly, the structural state also has a gradient distribution over the grain size. Constrained bending conditions provide a more uniform deformation field and lower average stresses in the deformation zone, which in turn leads to a smaller structural gradient in the cross section of the sample. After 4 cycles of free bending, a grain-subgrain structure with a minimum grain size of 7.0 +/- 0.5 mu m is formed in the surface layers of the workpiece, while in the central region, the grain size is 45 +/- 5 mu m.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/LTARF18010" target="_blank" >LTARF18010: Development of a plastic structure formation process for the fabrication of products with enhanced performance properties</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Letters on Materials

ISSN

2218-5046

e-ISSN

—

Volume of the periodical

9

Issue of the periodical within the volume

4

Country of publishing house

RU - RUSSIAN FEDERATION

Number of pages

5

Pages from-to

494-498

UT code for WoS article

000501586400025

EID of the result in the Scopus database

2-s2.0-85078984122