A stress-based proposal for wrinkling criterion of clamped surfaces

A stress-based proposal for wrinkling criterion of clamped surfaces

BORBÉLY Richárd, KÖLÜS Martin L., BÉRES Gábor J.

Abstract. This study presents a possible stress-based limit theory regarding the wrinkling occurrence of clamped surfaces. There are several theorems that describe the buckling and/or the wrinkling phenomenon in different forms and conditions, but a general description, which would represent the limit state of wrinkling in sheet metal forming still does not exist according to the authors knowledge. This could be particularly important for the finite element simulations that are mostly used for process minoring purposes. However, some software work with body elements is suitable for the representation of wrinkles, users do not receive information about how close a process is to the wrinkling limit, or how it is affected by the input parameters. This is even less estimable if shell, or membrane elements are used in a finite element code. In this work, a purely analytical calculation for the wrinkling limit stress of clamped surfaces is carried out, i.e., when blank holder tool acts on the sheet. To take into consideration the effect of the normal pressure, Wang and Cao’s proposal was used. After expressing the critical stress by its major and minor principal components using anisotropic yield criteria, a novel illustration method of the wrinkling limit has become available and is published in this article.

Keywords
Wrinkling Limit, Clamped Surfaces, Stress-Based Diagram

Published online 4/19/2023, 10 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: BORBÉLY Richárd, KÖLÜS Martin L., BÉRES Gábor J., A stress-based proposal for wrinkling criterion of clamped surfaces, Materials Research Proceedings, Vol. 28, pp 761-770, 2023

DOI: https://doi.org/10.21741/9781644902479-83

The article was published as article 83 of the book Material Forming

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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