A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies

This paper aims to develop a method for determining the workability diagram by varying frictional conditions in the cylinder upsetting test. The method is based on a known theoretical relationship between the average stress triaxiality ratio and in-surface strains if the initiation of fracture occur...

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Autores principales:	Dejan Movrin, Mladomir Milutinovic, Marko Vilotic, Sergei Alexandrov, Lihui Lang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ductile fracture workability diagram upsetting friction Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/43c07a60c12b45f784093b74d8817a13
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spelling	oai:doaj.org-article:43c07a60c12b45f784093b74d8817a132021-11-25T17:19:32ZA Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies10.3390/cryst111114112073-4352https://doaj.org/article/43c07a60c12b45f784093b74d8817a132021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1411https://doaj.org/toc/2073-4352This paper aims to develop a method for determining the workability diagram by varying frictional conditions in the cylinder upsetting test. The method is based on a known theoretical relationship between the average stress triaxiality ratio and in-surface strains if the initiation of fracture occurs at a traction-free surface. This relationship is valid for any rigid/plastic strain hardening material obeying the Mises-type yield criterion and its associated flow rule, which shows the wide applicability of the method. The experimental input to the method is the strain path at the site of fracture initiation. Neither experimental nor numerical determination of stress components is required at this site, though the general ductile fracture criterion involves the linear and quadratic invariants of the stress tensor. The friction law’s formulation is neither required, though the friction stress is the agent for varying the state of stress and strain at the site of ductile fracture initiation. The upsetting tests are carried out on normalized medium-carbon steel C45E, for which the workability diagram is available from the literature. Comparison of the latter and the diagram found using the new method shows that the new method is reliable for determining a certain portion of the workability diagram.Dejan MovrinMladomir MilutinovicMarko ViloticSergei AlexandrovLihui LangMDPI AGarticleductile fractureworkability diagramupsettingfrictionCrystallographyQD901-999ENCrystals, Vol 11, Iss 1411, p 1411 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ductile fracture workability diagram upsetting friction Crystallography QD901-999
spellingShingle	ductile fracture workability diagram upsetting friction Crystallography QD901-999 Dejan Movrin Mladomir Milutinovic Marko Vilotic Sergei Alexandrov Lihui Lang A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies
description	This paper aims to develop a method for determining the workability diagram by varying frictional conditions in the cylinder upsetting test. The method is based on a known theoretical relationship between the average stress triaxiality ratio and in-surface strains if the initiation of fracture occurs at a traction-free surface. This relationship is valid for any rigid/plastic strain hardening material obeying the Mises-type yield criterion and its associated flow rule, which shows the wide applicability of the method. The experimental input to the method is the strain path at the site of fracture initiation. Neither experimental nor numerical determination of stress components is required at this site, though the general ductile fracture criterion involves the linear and quadratic invariants of the stress tensor. The friction law’s formulation is neither required, though the friction stress is the agent for varying the state of stress and strain at the site of ductile fracture initiation. The upsetting tests are carried out on normalized medium-carbon steel C45E, for which the workability diagram is available from the literature. Comparison of the latter and the diagram found using the new method shows that the new method is reliable for determining a certain portion of the workability diagram.
format	article
author	Dejan Movrin Mladomir Milutinovic Marko Vilotic Sergei Alexandrov Lihui Lang
author_facet	Dejan Movrin Mladomir Milutinovic Marko Vilotic Sergei Alexandrov Lihui Lang
author_sort	Dejan Movrin
title	A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies
title_short	A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies
title_full	A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies
title_fullStr	A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies
title_full_unstemmed	A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies
title_sort	method for determining the workability diagram by varying friction conditions in the upsetting of a cylinder between flat dies
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/43c07a60c12b45f784093b74d8817a13
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A Method for Determining the Workability Diagram by Varying Friction Conditions in the Upsetting of a Cylinder between Flat Dies

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