Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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A Prediction of Bursting Failure in Tube Hydroforming Process Based on Necking Conditions

네킹발생조건에 의한 관재 액압성형 공정에서의 터짐 불량 예측

  • 김상우 (부산대학교 항공우주공학과 대학원) ;
  • 김정 (부산대학교 항공우주공학과) ;
  • 박훈재 (한국생산기술연구원 생산공정기술본부) ;
  • 강범수 (부산대학교 ERC/NSDM)
  • Published : 2004.11.01
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Abstract

Based on plastic instability, analytical prediction of bursting failure on tube hydroforming processes under combined infernal pressure and independent axial feeding is carried out. Bursting is irrecoverable phenomenon due to local instability under excessive tensile stresses. In order to predict the bursting failure, three different classical necking criteria such as diffuse necking criterion for sheet and tube, local necking criterion for sheet are introduced. The incremental theory of plasticity for anisotropic material is adopted and then the hydroforming limit and bursting failure diagram with respect to axial feeding and hydraulic pressure are presented. In addition, the influences of the material properties such as anisotropy Parameter, strain hardening exponent and strength coefficient on bursting Pressure are investigated. As results of the above approach, the hydroforming limit in view of bursting failure is verified with experimental results.

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References

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