Prediction of Gas Leak Tightness of Superplastically Formed Products

Corijn .H.C. Snippe, T. Meinders

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Abstract

In some applications, in this case an aluminium box in a subatomic particle detector containing highly sensitive detecting devices, it is important that a formed sheet should show no gas leak from one side to the other. In order to prevent a trial-and-error procedure to make this leak tight box, a method is set up to predict if a formed sheet conforms to the maximum leak constraint. The technique of superplastic forming (SPF) is used in order to attain very high plastic strains before failure. Since only a few of these boxes are needed, this makes, this generally slow, process an attractive production method. To predict the gas leak of a superplastically formed aluminium sheet in an accurate way, finite element simulations are used in combination with a user-defined material model. This constitutive model couples the leak rate with the void volume fraction. This void volume fraction is then dependent on both the equivalent plastic strain and the applied hydrostatic pressure during the bulge process (backpressure).
Original languageEnglish
Title of host publicationNUMIFORM 2010
Subtitle of host publicationProceedings of the 10th International Conference on Numerical Methods in Industrial Forming
EditorsF. Barlat, Y.H. Moon, M.G. Lee
Place of PublicationNew York, NY
PublisherAIP
Pages818-825
ISBN (Print)978-0-7354-0800-5
DOIs
Publication statusPublished - 13 Jun 2010
Event10th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2010 - Pohang, Korea, Republic of
Duration: 13 Jun 201017 Jun 2010
Conference number: 10

Publication series

NameAIP Conference Proceedings
PublisherAIP
Volume1252
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference10th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2010
Abbreviated titleNUMIFORM
CountryKorea, Republic of
CityPohang
Period13/06/1017/06/10

Keywords

  • Superplasticity
  • Gas leak
  • Sheet forming simulations

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    Snippe, C. . H. C., & Meinders, T. (2010). Prediction of Gas Leak Tightness of Superplastically Formed Products. In F. Barlat, Y. H. Moon, & M. G. Lee (Eds.), NUMIFORM 2010: Proceedings of the 10th International Conference on Numerical Methods in Industrial Forming (pp. 818-825). (AIP Conference Proceedings; Vol. 1252). New York, NY: AIP. https://doi.org/10.1063/1.3457639