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Erschienen in: International Journal of Material Forming 1/2023

01.01.2023 | Developments in modelling and simulation..Japan, South Korea and China

Prediction for cryogenic formability of AA2219 alloy cylindrical parts with friction stir weld

verfasst von: Wei Liu, Yonggang Hao, Wen Sun, Mengjia Yao

Erschienen in: International Journal of Material Forming | Ausgabe 1/2023

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Abstract

A cryogenic deep drawing process was proposed for complex curved surface part forming with aluminum alloy friction stir welded (FSW) blanks. The experimental forming limit curves (FLCs) of AA2219 alloy FSW blanks were obtained using the Nakajima tests at -196 °C. The theoretical FLC of base metal (BM) and weld zone for the FSW blank were calculated by M-K theory, respectively. The limited drawing ratio (LDR) was tested by the deep drawing of the hemispherical bottom cylindrical parts, and the splitting behavior of the drawn-part at ultra-low temperature was accurately predicted using the numerical simulations combined with theoretical FLCs. It was found that the forming limits and LDR of the FSW blanks were improved at -196 °C, and the FLD0 and LDR reached to 0.27 and 1.90, respectively. The improved cryogenic deep drawability was attributed to hyper hardening and high plasticity of the FSW blanks, which help to transfer deformation and prevent localized deformation from splitting in weak deformation zone. Finally, three effective methods were further proposed to improve cryogenic formability of FSW blanks. The increased blank holder force can ensure the suppressed co-existence of wrinkling and splitting due to increased resistance to localized deformation ability during cryogenic deep drawing. The strain distribution between the weld and BM zone of the deep drawn parts was more uniform by isothermal condition. Furthermore, the cryogenic formability can be further improved for the FSW blank with an offset weld.

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Literatur
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Metadaten
Titel
Prediction for cryogenic formability of AA2219 alloy cylindrical parts with friction stir weld
verfasst von
Wei Liu
Yonggang Hao
Wen Sun
Mengjia Yao
Publikationsdatum
01.01.2023
Verlag
Springer Paris
Erschienen in
International Journal of Material Forming / Ausgabe 1/2023
Print ISSN: 1960-6206
Elektronische ISSN: 1960-6214
DOI
https://doi.org/10.1007/s12289-022-01724-1

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