Improving the accuracy of finite element modeling of superplastic forming processes

O.P. Tulupova ORCID logo , C. Gumerova, V.R. Ganieva ORCID logo , A.A. Kruglov, F.U. Enikeev ORCID logo show affiliations and emails
Received 12 March 2022; Accepted 13 May 2022;
Citation: O.P. Tulupova, C. Gumerova, V.R. Ganieva, A.A. Kruglov, F.U. Enikeev. Improving the accuracy of finite element modeling of superplastic forming processes. Lett. Mater., 2022, 12(2) 142-147
BibTex   https://doi.org/10.22226/2410-3535-2022-2-142-147

Abstract

Unlike of our previous report the method suggested takes into account consideration the initial stage of superplastic forming, when the pressure of the inert gas changes from the initial zero level to a pre-given constant value. It is shown that such kind refinement enables one to improve considerably the accuracy of calculating the value of the strain rate sensitivity index, m, and, as a result, to provide more accurate finite element description of the superplastic forming processes.A method of improving the accuracy of finite element modeling of superplastic forming processes is suggested. It is based on improving the accuracy of determining the values of material constants for the standard power law of superplastic flow from the results of technological experiments under constant pressure forming of hemispherical domes. Unlike other known procedures, the method suggested takes into consideration the initial stage of superplastic forming, when the pressure of the inert gas changes from the initial zero level to a pre-given constant value. Since this part of loading is usually neglected in reports known in the literature the main attention in the present study is paid to the analysis of its importance as far as the accuracy of finite element modeling is concerned. Besides, the entry radius in the die used is also a variable in the analysis. The calculations are performed for alloys Ti-6Al-4V, AZ31, AA5083 using the experimental data known in the literature. Finite element modeling is carried out using the ANSYS code. It is concluded that the influence of the initial part of loading should be considered in finite element modeling of the superplastic forming processes since this factor can affect the accuracy of predictions.

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