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<p>Workability is the term that is commonly used to refer to the ease with which metal can be shaped during bulk forming processes. Experimental tests of compression testing are performed on cylindrical, ring, tapered and flanged samples in different geometries. For each of the different strain paths, axial and circumferential strains are calculated and the workability diagram is extracted. One of the most important theoretical methods to obtain these diagrams is the method of continuous damage mechanics. Thermodynamically consistent, non-associative and fully anisotropic elastoplastic constitutive equations strongly coupled with ductile anisotropic damage developed in previous work are used to study compression tests validation which includes Hill's yield criterion and combined nonlinear isotropic and kinematic hardening. The implemented formulation has been defined in the framework of thermodynamics of irreversible processes and a symmetric second-order tensor is adopted to describe the anisotropic damage state variable.The damage model is implemented with VUMAT coding and ABAQUS/Explicit software, and is used to simulate experiments to determine the workability diagram of C22000 alloy in bulk forming processes. But of course, damage level is being unknown in this diagram. Thus, with this method, extraction of diagram is drawn more comprehensively. The intended failure point is not the only point. Different levels of damage and damage evolution can be used to express different regions of the workability diagram.</p>

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Appling ductile damage mechanics criterion to predict workability of C22000 in bulk metal forming; with different damage levels

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Seyyed Mohsen Seyyed Hatami,
  • Mehrdad Khandaei,
  • Hosein Lexian

摘要

Workability is the term that is commonly used to refer to the ease with which metal can be shaped during bulk forming processes. Experimental tests of compression testing are performed on cylindrical, ring, tapered and flanged samples in different geometries. For each of the different strain paths, axial and circumferential strains are calculated and the workability diagram is extracted. One of the most important theoretical methods to obtain these diagrams is the method of continuous damage mechanics. Thermodynamically consistent, non-associative and fully anisotropic elastoplastic constitutive equations strongly coupled with ductile anisotropic damage developed in previous work are used to study compression tests validation which includes Hill's yield criterion and combined nonlinear isotropic and kinematic hardening. The implemented formulation has been defined in the framework of thermodynamics of irreversible processes and a symmetric second-order tensor is adopted to describe the anisotropic damage state variable.The damage model is implemented with VUMAT coding and ABAQUS/Explicit software, and is used to simulate experiments to determine the workability diagram of C22000 alloy in bulk forming processes. But of course, damage level is being unknown in this diagram. Thus, with this method, extraction of diagram is drawn more comprehensively. The intended failure point is not the only point. Different levels of damage and damage evolution can be used to express different regions of the workability diagram.