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<p>This study investigates the fracture behaviour of thin-walled Inconel sheet metal intended for forming lightweight and geometrically complex aerospace components. The Lou-Huh ductile damage model, coupled with the Barlat 1989 anisotropic yield criterion, was employed to predict fracture limits across four distinct stress states: pure shear, uniaxial tension, plane strain, and equi-biaxial tension. Four conventional damage models, Cockroft-Latham, Brozzo, Oh, and Rice-Tracey, were evaluated for comparison. Nine specimen configurations were experimentally deformed by uniaxial tensile testing and stretch-forming setups. The fracture strains were determined both experimentally and numerically, represented in the major-minor strain space and subsequently transformed into the equivalent plastic strain versus stress triaxiality space. Numerically predicted fracture locations showed strong consistency with experimental observations. Among all models, the Lou-Huh model demonstrated superior predictive accuracy across the entire stress triaxiality range, owing to its explicit consideration of shear-driven mechanisms of void coalescence.</p>

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Fracture Prediction of Ni-Based Super Alloy Thin Sheet Deformed Under Different Stress States

  • 期刊论文

  • 发表日期：

    2026年5月30日

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  • Ayush Morchhale,
  • Aarjoo Jaimin,
  • Suswanth Poluru,
  • Nitin Kotkunde,
  • U. Sachin Ural,
  • Siddhant Arvikar,
  • Tanya Buddi,
  • Swadesh Kumar Singh

摘要

This study investigates the fracture behaviour of thin-walled Inconel sheet metal intended for forming lightweight and geometrically complex aerospace components. The Lou-Huh ductile damage model, coupled with the Barlat 1989 anisotropic yield criterion, was employed to predict fracture limits across four distinct stress states: pure shear, uniaxial tension, plane strain, and equi-biaxial tension. Four conventional damage models, Cockroft-Latham, Brozzo, Oh, and Rice-Tracey, were evaluated for comparison. Nine specimen configurations were experimentally deformed by uniaxial tensile testing and stretch-forming setups. The fracture strains were determined both experimentally and numerically, represented in the major-minor strain space and subsequently transformed into the equivalent plastic strain versus stress triaxiality space. Numerically predicted fracture locations showed strong consistency with experimental observations. Among all models, the Lou-Huh model demonstrated superior predictive accuracy across the entire stress triaxiality range, owing to its explicit consideration of shear-driven mechanisms of void coalescence.