Reduction of the residual stresses in cold expanded thick-walled cylinders by plastic compression; Defence Technology; Vol. 12, iss. 6

Reduction of the residual stresses in cold expanded thick-walled cylinders by plastic compression; Defence Technology; Vol. 12, iss. 6

Bibliographic Details
Parent link:Defence Technology: Scientific Journal
Vol. 12, iss. 6.— 2016.— [P. 473-479]
Corporate Author: Национальный исследовательский Томский политехнический университет Инженерная школа новых производственных технологий Отделение материаловедения
Other Authors: Skvortsov V. F. Vladimir Fedorovich, Boznak A. O. Aleksey Olegovich, Kim A. B. Aleksey Bogovich, Arlyapov A. Yu. Aleksey Yurievich, Dmitriev A. I. Andrey Ivanovich
Summary:Title screen
We suppose that in order to maintain high accuracy of holes and to lower residual stresses after cold expansion of thick-walled cylinders, which undergo cross-section plastic deformation, it is necessary to perform axial plastic compression and subsequent cold expansion with small interferences. To test this hypothesis, we studied hoop, radial and axial residual stresses in cylinders made of carbon steel AISI 1050 with hole diameter of 5 mm, outer diameter of 15 mm and length of 30 mm by Sachs method as well as accuracy of expanded holes. It is found that double cold expansion with total interference equal to 5.1% generates hoop residual stresses with largest absolute value equal to 284 MPa and ensures high holes accuracy (IT7). After plastic compression with strain equal to 0.5 and 1% the mentioned stresses reduced to 120 and 75 MPa respectively, and accuracy of the holes reduced as well. Subsequent cold expansion with small interference equal to 0.9% helps to restore holes accuracy (IT7) gained by double cold expansion and ensure that absolute value of hoop residual stresses (177 MPa) is lower compared to double cold expansion.
Режим доступа: по договору с организацией-держателем ресурса
Language:English
Published: 2016
Subjects:
электронный ресурс
труды учёных ТПУ
thick-walled cylinders
cold expansion
plastic compression
residual stresses
Online Access:https://doi.org/10.1016/j.dt.2016.08.002
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=667263

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