Prediction of Gas Leak Tightness of Superplastically Formed Products

Corijn .H.C. Snippe; T. Meinders

doi:10.1063/1.3457639

Prediction of Gas Leak Tightness of Superplastically Formed Products

Corijn .H.C. Snippe, T. Meinders

Faculty of Engineering Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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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 language	English
Title of host publication	NUMIFORM 2010
Subtitle of host publication	Proceedings of the 10th International Conference on Numerical Methods in Industrial Forming
Editors	F. Barlat, Y.H. Moon, M.G. Lee
Place of Publication	New York, NY
Publisher	American Institute of Physics
Pages	818-825
ISBN (Print)	978-0-7354-0800-5
DOIs	https://doi.org/10.1063/1.3457639
Publication status	Published - 13 Jun 2010
Event	10th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2010 - Pohang, Korea, Republic of Duration: 13 Jun 2010 → 17 Jun 2010 Conference number: 10

Publication series

Name	AIP Conference Proceedings
Publisher	AIP
Volume	1252
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	10th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2010
Abbreviated title	NUMIFORM
Country/Territory	Korea, Republic of
City	Pohang
Period	13/06/10 → 17/06/10

Keywords

Superplasticity
Gas leak
Sheet forming simulations

Access to Document

10.1063/1.3457639

Snippe10predictionAccepted author version, 1.17 MB

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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). American Institute of Physics. https://doi.org/10.1063/1.3457639

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title = "Prediction of Gas Leak Tightness of Superplastically Formed Products",

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).",

keywords = "Superplasticity, Gas leak, Sheet forming simulations",

author = "Snippe, {Corijn .H.C.} and T. Meinders",

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Snippe, CHC & Meinders, T 2010, Prediction of Gas Leak Tightness of Superplastically Formed Products. in F Barlat, YH Moon & MG Lee (eds), NUMIFORM 2010: Proceedings of the 10th International Conference on Numerical Methods in Industrial Forming. AIP Conference Proceedings, vol. 1252, American Institute of Physics, New York, NY, pp. 818-825, 10th International Conference on Numerical Methods in Industrial Forming Processes, NUMIFORM 2010, Pohang, Korea, Republic of, 13/06/10. https://doi.org/10.1063/1.3457639

Prediction of Gas Leak Tightness of Superplastically Formed Products. / Snippe, Corijn .H.C.; Meinders, T.
NUMIFORM 2010: Proceedings of the 10th International Conference on Numerical Methods in Industrial Forming. ed. / F. Barlat; Y.H. Moon; M.G. Lee. New York, NY: American Institute of Physics, 2010. p. 818-825 (AIP Conference Proceedings; Vol. 1252).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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N2 - 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).

AB - 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).

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Prediction of Gas Leak Tightness of Superplastically Formed Products

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