Material model calibration for superplastic forming

Show simple item record Jordaan, M.S. Kok, Schalk 2018-10-30T05:02:55Z 2019
dc.description.abstract Superplastic forming is a slow forming process. The forming time can be minimized by optimizing the pressure profile applied to the forming sheet. The optimization of the superplastic forming pressure is usually done such that a target strain rate at a high strain rate sensitivity is maintained. Careful consideration of the strain rate is required, since localized thinning can occur when the material is strained too quickly. This paper demonstrates that it is essential to explicitly include strain rate sensitivity data, obtained from strain rate jump tests, during the calibration of material model used for superplastic forming simulations. Conventional calibration methods only consider stress–strain data at different strain rates. Such an approach implicitly assumes that a material model that matches the stress–strain data at the different strain rates, will automatically match strain rate sensitivity data. However, by explicitly including the strain rate sensitivity data, the selected material model is more susceptible to localized thinning as the applied strain rate is increased. It is essential for the selected material model to exhibit this behaviour to prevent superplastic forming simulations at high strain rates from predicting stable deformation, when in fact localized thinning will occur. en_ZA
dc.description.department Mechanical and Aeronautical Engineering en_ZA
dc.description.embargo 2019-07-03
dc.description.librarian hj2018 en_ZA
dc.description.uri en_ZA
dc.identifier.citation M.S. Jordaan & S. Kok (2019) Material model calibration forsuperplastic forming, Inverse Problems in Science and Engineering, 27:5, 589-607, DOI:10.1080/17415977.2018.1489802 en_ZA
dc.identifier.issn 1741-5977 (print)
dc.identifier.issn 1741-5985 (online)
dc.identifier.other 10.1080/17415977.2018.1489802
dc.language.iso en en_ZA
dc.publisher Taylor and Francis en_ZA
dc.rights © 2018 Informa UK Limited, trading as Taylor & Francis Group. This is an electronic version of an article published in Inverse Problems in Science and Engineering, vol. 27, no. 5, pp. 589-607, 2019. doi : 10.1080/17415977.2018.1489802. Inverse Problems in Science and Engineering is available online at : en_ZA
dc.subject Material model en_ZA
dc.subject Superplastic forming en_ZA
dc.subject Strain rate sensitivity en_ZA
dc.subject Finite element method en_ZA
dc.subject Optimization en_ZA
dc.subject Pressure profiles en_ZA
dc.subject Localized thinning en_ZA
dc.subject High strain rates en_ZA
dc.subject Calibration method en_ZA
dc.subject Automatically match en_ZA
dc.subject Superplasticity en_ZA
dc.title Material model calibration for superplastic forming en_ZA
dc.type Postprint Article en_ZA

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