A stress-based proposal for wrinkling criterion of clamped surfaces
BORBÉLY Richárd, KÖLÜS Martin L., BÉRES Gábor J.download PDF
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.
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
The article was published as article 83 of the book Material Forming
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