Investigation into Detection Criteria for Wrinkling in Tube Hydroforming

Document Type : Research Article

Authors

Department of Mechanical Engineering, University of Mashhad, Mashhad, Iran

Abstract

One of the most common non-traditional forming process, is the tube hydroforming,
which is widely used for to form various tubular parts. To produce final product without any failure,
tube hydroforming process is strictly dependent on load path, internal pressure-axial feed. Major
modes of failure which may be occur in tube hydroforming process are necking, bursting, buckling and
wrinkling. Predicting and preventing each of these failures are very important and leads to defects-free
products. In this study, geometrical criteria for detecting wrinkling in numerical methods such as finite
element analysis are reviewed. This type of identifying the wrinkling can be pointed out such as the first
derivative or geometric slope and length to area indices criteria. In this paper, a new geometric method
as a center of volume is introduced. In this case, the center of volume of wrinkled part is not equal with
the wrinkled-free one. In order to verify, the results of this new criterion were compared with the results
of previous measures and experimental tests in published articles.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 49, Issue 4
March 2018
Pages 829-838

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