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The roles of yield function and plastic potential under non-associated flow rule for formability prediction with perturbation approach

Hu, Q and Yoon, Jeong Whan 2020, The roles of yield function and plastic potential under non-associated flow rule for formability prediction with perturbation approach, in IDDRG 2020 : Proceedings of the 39th International Deep-Drawing Research Group Annual Conference 2020, IOP Publishing, Bristol, Eng., pp. 1-7, doi: 10.1088/1757-899X/967/1/012027.

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Title The roles of yield function and plastic potential under non-associated flow rule for formability prediction with perturbation approach
Author(s) Hu, Q
Yoon, Jeong WhanORCID iD for Yoon, Jeong Whan orcid.org/0000-0002-7616-5253
Conference name International Deep-Drawing Research Group. Conference (39th : 2020 : Online from Seoul, South Korea)
Conference location Online from Seoul, South Korea
Conference dates 2020/10/26 - 2020/10/30
Title of proceedings IDDRG 2020 : Proceedings of the 39th International Deep-Drawing Research Group Annual Conference 2020
Editor(s) [Unknown]
Publication date 2020
Series International Deep-Drawing Research Group Conference
Start page 1
End page 7
Total pages 7
Publisher IOP Publishing
Place of publication Bristol, Eng.
Keyword(s) perturbation approach
non-associated flow rule (non-AFR)
yield function
plastic potential function
Summary In this study, the perturbation approach for predicting material's forming limit strains under non-associated flow rule (non-AFR) is proposed. The influence of yield function and plastic potential function on the forming limit curve (FLC) evaluated by the perturbation approach are discussed through analyzing the normalized growth rate of a perturbation. In the framework of non-AFR, Hill'48 and Yld2000-2d are chosen for AA5754-O. The results show that the left side of FLCs predicted with the different forms of yield function and plastic potential nearly overlap. Hence, it is concluded that the yield function and plastic potential have a negligible influence on the forming limit strain under a negative strain path. However, the FLC under a positive strain path is principally dependent on the relationship between strain ratio β and stress ratio α, which can be determined by the plastic potential. Additionally, in comparison to the FLC under AFR, an increase in the forming limits strain is observed near the plain strain region, when the derivative of the normalized yield function concerning α is positive and vice versa.
ISSN 1757-8981
1757-899X
Language eng
DOI 10.1088/1757-899X/967/1/012027
Indigenous content off
HERDC Research category E1 Full written paper - refereed
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30146487

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.