Characterisation of out-of-plane shear behaviour of anisotropic sheet materials based on indentation plastometry

Satošek, Roman (author), Pepelnjak, Tomaž (author), Starman, Bojan (author)

This paper presents a new methodology for characterising the out-of-plane plastic anisotropy behaviour of sheet metal, based on indentation testing. Conventionally, advanced yield criteria are used to describe plastic anisotropy, requiring multiple in-plane mechanical tests (such as uniaxial and biaxial tests) to calibrate a model. However, in certain forming applications (e.g. blanking, ironing and incremental forming), the influence of mechanical behaviour through thickness cannot be ignored, necessitating the characterisation of out-of-plane material behaviour. To do this, a 3D plastic anisotropy model must be used and calibrated for the out-of-plane shear parameters, which can be difficult to determine. Researchers often assume an isotropic case or equal shear parameters for in-plane and out-of-plane behaviour. More advanced calibrations involve the crystal plasticity model. In this work, we propose a two-stage calibration procedure. In the first stage, we calibrate the in-plane parameters of the YLD2004–18p yield function conventionally. In the second stage, after fixing the in-plane parameters, we determine the remaining out-of-plane shear parameters based on the results of the ball indentation test. We show for the first time that out-of-plane shear parameters can be determined from a macro-mechanical test for a 2.42 mm thick cold-rolled AA5754-H22 series aluminium sheet.

• Language: English
• Keywords: plastic anisotropy, out-of-plane shear resistance, indentation test, indentation plastometry, YLD2004–18p, yield function
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 15 str.
• Numbering: Vol. 253, art. 108403
• PID: 20.500.12556/RUL-145687
• UDC: 620.1:621.795.8
• ISSN on article: 0020-7403
• DOI: 10.1016/j.ijmecsci.2023.108403
• COBISS.SI-ID: 149875203
• Publication date in RUL: 09.05.2023

Record is a part of a journal

• Title: International journal of mechanical sciences
• Shortened title: Int. j. mech. sci.
• Publisher: Elsevier
• ISSN: 0020-7403
• COBISS.SI-ID: 25648384

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: plastična anizotropija, odpor proti strigu izven ravnine, preskus z vtiskovanjem, plastometrija z vtiskovanjem, YLD2004-18p, funkcija plastičnosti