Document Type

Article

Publication Date

12-1-2004

Abstract

The analysis and modeling of tube-hydroformed components is more complicated than that employed for sheet-metal panels, due to the lengthier process sequence and variable strain path - from flat-rolled sheet to tube; from straight tube to bent tube; and from bent tube to hydroformed component. These additional process steps make it difficult to determine whether post mortem analyses of tube failure during hydroforming can, and should, be conducted with the same tools and databases as used for simple stampings. To provide a partial answer, the properties of commercially fabricated welded straight tubes were evaluated using a free-expansion internal pressure test and compared with those of free-expansion internal pressure tests on bent tubes. The results demonstrated that the behavior of the bent tube was consistent with the mechanical properties of the as-received tube, provided due notice was accorded to the complex strain history of the bent tube. However, due to the strain-path changes occurring at the failure location, conventional approaches for monitoring strain history would yield (apparently) anomalous results.

Journal Title

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Volume

35

Issue

13

First Page

1151

Last Page

1158

DOI

https://doi.org/10.1007/s11661-004-1018-3

First Department

Engineering

Acknowledgements

Free article retrieved April 2, 2021 from https://link.springer.com/content/pdf/10.1007/s11661-004-1018-3.pdf

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