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<p>The complete parameterization of complex anisotropic material models for forming simulation of tubes presents significant challenges due to the inherent limitations of tube material testing. Furthermore, the impact of anisotropic material behavior on the hydroforming process, along with the relevance of specific parameters, remains inadequately understood. This study aims to investigate how selected parameters within elastic-visco-plastic anisotropic material models influence hydroforming simulations. Sensitivity analyses are conducted across three distinct characteristic hydroforming geometries, employing a zone-based approach to enable systematic comparison of parameter sensitivities and their correlation with the underlying hydroforming geometries. The results reveal substantial variations in sensitivity driven by differences in plastic strains, diverse strain or stress states, and interactions between neighboring zones. For accurate material modeling of E235 carbon steel tubes in hydroforming applications, determining the true stress–strain curve is basically important. Additionally, experimental quantification of strain rate sensitivity <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(p\)</EquationSource> </InlineEquation>, uniaxial yield stress <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\sigma}_{90}\)</EquationSource> </InlineEquation>, and biaxial yield stress <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({\sigma}_{b}\)</EquationSource> </InlineEquation> is essential for ensuring simulation precision.&#xa0;&#xa0;&#xa0;&#xa0;</p>

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Understanding the effect of anisotropic material model parameters for tube hydroforming simulations

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月31日

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  • Franz Reuther,
  • Sven Winter,
  • Verena Psyk,
  • Verena Kräusel

摘要

The complete parameterization of complex anisotropic material models for forming simulation of tubes presents significant challenges due to the inherent limitations of tube material testing. Furthermore, the impact of anisotropic material behavior on the hydroforming process, along with the relevance of specific parameters, remains inadequately understood. This study aims to investigate how selected parameters within elastic-visco-plastic anisotropic material models influence hydroforming simulations. Sensitivity analyses are conducted across three distinct characteristic hydroforming geometries, employing a zone-based approach to enable systematic comparison of parameter sensitivities and their correlation with the underlying hydroforming geometries. The results reveal substantial variations in sensitivity driven by differences in plastic strains, diverse strain or stress states, and interactions between neighboring zones. For accurate material modeling of E235 carbon steel tubes in hydroforming applications, determining the true stress–strain curve is basically important. Additionally, experimental quantification of strain rate sensitivity \(p\) , uniaxial yield stress \({\sigma}_{90}\) , and biaxial yield stress \({\sigma}_{b}\) is essential for ensuring simulation precision.