Multiple necks around biaxially loaded holes in sheets

Arndt, S.; Świłło, S.; Atkins, A.G.

doi:10.1016/s0020-7403(99)00114-9

Cited by 13 publications

(1 citation statement)

References 6 publications

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“…Suppression of necking is not unknown in sheet metal forming. For example, Arndt et al [23] investigated the formation of multiple necks in the biaxial expansion of annuli of ductile sheets, and showed that the continuous growth of necks was only possible if the following two necessary and sufficient conditions for the formation of necks in plane strain were fulfilled.…”

Section: Variation In the Thickness Of Spif Parts And Absence Of Neckingmentioning

confidence: 99%

Single‐point incremental forming and formability—failure diagrams

Silva

Skjoedt

Atkins

et al. 2008

The Journal of Strain Analysis for Engineering Design

195

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In recent work, the present authors constructed a closed-form analytical model that is capable of dealing with the fundamentals of single-point incremental forming (SPIF) and explaining the experimental and numerical results published in the literature over the past couple of years. The model is based on membrane analysis with in-plane contact frictional forces but is limited to plane strain, rotationally symmetric conditions.The aim of the present paper is twofold: first, to extend the previous closed-form analytical model into a theoretical framework that can easily be applied to the different modes of deformation that are commonly found in general single-point incremental forming processes and, second, to investigate the formability limits of SPIF in terms of ductile damage mechanics and the question of whether necking does, or does not, precede fracture.Experimentation by the present authors, together with data retrieved from the literature, confirms that the proposed theoretical framework is capable of successfully addressing the influence of the major parameters of the SPIF process. It is demonstrated that neck formation is suppressed in SPIF, so that traditional forming limit diagrams are inapplicable to describe failure. Instead fracture forming limit diagrams should be employed.

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Section: Variation In the Thickness Of Spif Parts And Absence Of Neckingmentioning

confidence: 99%