Numerical and experimental analysis of the isothermal high temperature pneumoforming process

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dc.contributor.authorKamaliev, Mike
dc.contributor.authorFlesch, Jan
dc.contributor.authorGrodotzki, Joshua
dc.contributor.authorTekkaya, A. Erman
dc.date.accessioned2025-02-18T14:31:23Z
dc.date.available2025-02-18T14:31:23Z
dc.date.issued2023-07-04
dc.description.abstractThe isothermal high temperature pneumoforming process to form tubes at constant elevated temperatures by means of internal pressure is investigated. Two materials, a ferritic (X2CrTiNb18) and a martensitic stainless steel (X12Cr13) are used for the investigations. The required material characterization is performed at the temperature and strain rate of the actual process. A new method for quantifying thermal softening via the time-dependent decrease in static yield stress is presented. At a temperature of 1000 °C, the static yield stress decreases by 50% within 100 s for both materials. The numerical models are validated on the basis of the formed geometry and used to study the influence of maximum internal pressure, axial feed, holding time under load and die edge length on the final part geometry. It was observed, that with higher internal pressures and longer holding times smaller corner radii are formed for both materials. In contrast, a superimposed axial feed as well as the effective friction coefficient have a negligible influence on the formed geometry. With an increasing die edge length, smaller radii are formed with the ferritic stainless steel numerically and experimentally. By contrast, for the martensitic stainless steel, larger radii are observed numerically. Experimentally, the limited formability of these tubes weld seam becomes apparent. Based on the findings, process windows depending on the process parameters internal pressure and die edge length were derived. Numerically, forming limit curves of tubular semi-finished products under comparable conditions serve as a failure criterion. Good agreement with experiments was observed.en
dc.identifier.urihttp://hdl.handle.net/2003/43473
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-25306
dc.language.isoen
dc.relation.ispartofseriesInternational journal of material forming; 16(4)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectPneumoformingen
dc.subjectHydroformingen
dc.subjectElevated temperaturesen
dc.subjectHot stampingen
dc.subjectPress hardeningen
dc.subjectStainless steelen
dc.subject.ddc620
dc.subject.ddc670
dc.subject.rswkIsothermes Umformende
dc.subject.rswkHydroumformende
dc.subject.rswkRohrumformende
dc.subject.rswkHeißprägende
dc.subject.rswkFormhärtende
dc.subject.rswkMartensitischer Stahlde
dc.subject.rswkFerritischer Stahlde
dc.titleNumerical and experimental analysis of the isothermal high temperature pneumoforming processen
dc.typeText
dc.type.publicationtypeArticle
dcterms.accessRightsopen access
eldorado.secondarypublicationtrue
eldorado.secondarypublication.primarycitationKamaliev, M. et al. (2023) ‘Numerical and experimental analysis of the isothermal high temperature pneumoforming process’, International journal of material forming, 16(4). Available at: https://doi.org/10.1007/s12289-023-01767-y
eldorado.secondarypublication.primaryidentifierhttps://doi.org/10.1007/s12289-023-01767-y

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