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Bifurcation analysis based on a material model with stress-rate dependency and non-associated flow rule for fracture prediction in metal forming

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Τίτλος: Bifurcation analysis based on a material model with stress-rate dependency and non-associated flow rule for fracture prediction in metal forming
Συγγραφείς: Oya, Tetsuo, Yanagimoto, Jun, Ito, Koichi, Uemura, Gen, Mori, Naomichi
Στοιχεία εκδότη: CIMNE
Έτος έκδοσης: 2017
Συλλογή: Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge
Θεματικοί όροι: Àrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits, Finite element method, Plasticity -- Mathematical models, Metal Forming, Fracture Prediction, Bifurcation Theory, Plastic Constitu- tive Equation, Stress–rate Dependency, Non–associated Flow Rule, Elements finits, Mètode dels, Plasticitat -- Models matemàtics, Plasticitat
Περιγραφή: Recent increasing application of advanced high-strength metals causes grow-ing demand for accurate fracture prediction in metal forming simulation. However, since the construction of objective and reliable fracture prediction method is generally difficult, essential progress in fundamental theory that supports evolution of fracture rediction framework is required. In this study, a fracture prediction framework based on the bifurcation theory is pre- sented. The main achievement is a novel material model based on stress-rate dependency related with non-associate flow rule. This model is based on non-associated flow rule with independent arbitrary higher-order yield function and plastic potential function for any anisotropic materials. And this formulation is combined with the stress-rate depen- dency plastic constitutive equation, which is known as Ito-Goya model, to construct a generalized plastic constitutive model in which non-normality and non-associativity are reasonably considered. Then, by adopting the three-dimensional bifurcation theory, which is known as the 3D localized bifurcation theory, more accurate prediction of the initiation of shear band is realized, leading to general and reliable construction of forming limit dia- gram. Then, by using virtual material data, numerical simulation is carried out to exhibit fracture limit diagram for demonstrating the generality and reliability of the proposed methodology. In particular, the effect of stress-rate dependency on the bifurcation analy- sis is investigated, and the order of the yield function is used to investigate the influence on the forming limit prediction.
Τύπος εγγράφου: conference object
Περιγραφή αρχείου: 8 p.; application/pdf
Γλώσσα: English
Relation: https://hdl.handle.net/2117/180376
Διαθεσιμότητα: https://hdl.handle.net/2117/180376
Rights: Open Access
Αριθμός Καταχώρησης: edsbas.D0A962F
Βάση Δεδομένων: BASE
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  Data: Bifurcation analysis based on a material model with stress-rate dependency and non-associated flow rule for fracture prediction in metal forming
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  Data: <searchLink fieldCode="AR" term="%22Oya%2C+Tetsuo%22">Oya, Tetsuo</searchLink><br /><searchLink fieldCode="AR" term="%22Yanagimoto%2C+Jun%22">Yanagimoto, Jun</searchLink><br /><searchLink fieldCode="AR" term="%22Ito%2C+Koichi%22">Ito, Koichi</searchLink><br /><searchLink fieldCode="AR" term="%22Uemura%2C+Gen%22">Uemura, Gen</searchLink><br /><searchLink fieldCode="AR" term="%22Mori%2C+Naomichi%22">Mori, Naomichi</searchLink>
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  Data: CIMNE
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  Data: 2017
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  Data: Universitat Politècnica de Catalunya, BarcelonaTech: UPCommons - Global access to UPC knowledge
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– Name: Abstract
  Label: Description
  Group: Ab
  Data: Recent increasing application of advanced high-strength metals causes grow-ing demand for accurate fracture prediction in metal forming simulation. However, since the construction of objective and reliable fracture prediction method is generally difficult, essential progress in fundamental theory that supports evolution of fracture rediction framework is required. In this study, a fracture prediction framework based on the bifurcation theory is pre- sented. The main achievement is a novel material model based on stress-rate dependency related with non-associate flow rule. This model is based on non-associated flow rule with independent arbitrary higher-order yield function and plastic potential function for any anisotropic materials. And this formulation is combined with the stress-rate depen- dency plastic constitutive equation, which is known as Ito-Goya model, to construct a generalized plastic constitutive model in which non-normality and non-associativity are reasonably considered. Then, by adopting the three-dimensional bifurcation theory, which is known as the 3D localized bifurcation theory, more accurate prediction of the initiation of shear band is realized, leading to general and reliable construction of forming limit dia- gram. Then, by using virtual material data, numerical simulation is carried out to exhibit fracture limit diagram for demonstrating the generality and reliability of the proposed methodology. In particular, the effect of stress-rate dependency on the bifurcation analy- sis is investigated, and the order of the yield function is used to investigate the influence on the forming limit prediction.
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  Data: https://hdl.handle.net/2117/180376
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RecordInfo BibRecord:
  BibEntity:
    Languages:
      – Text: English
    Subjects:
      – SubjectFull: Àrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Plasticity -- Mathematical models
        Type: general
      – SubjectFull: Metal Forming
        Type: general
      – SubjectFull: Fracture Prediction
        Type: general
      – SubjectFull: Bifurcation Theory
        Type: general
      – SubjectFull: Plastic Constitu- tive Equation
        Type: general
      – SubjectFull: Stress–rate Dependency
        Type: general
      – SubjectFull: Non–associated Flow Rule
        Type: general
      – SubjectFull: Elements finits
        Type: general
      – SubjectFull: Mètode dels
        Type: general
      – SubjectFull: Plasticitat -- Models matemàtics
        Type: general
      – SubjectFull: Plasticitat
        Type: general
    Titles:
      – TitleFull: Bifurcation analysis based on a material model with stress-rate dependency and non-associated flow rule for fracture prediction in metal forming
        Type: main
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            NameFull: Oya, Tetsuo
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            NameFull: Yanagimoto, Jun
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            NameFull: Ito, Koichi
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            NameFull: Uemura, Gen
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            NameFull: Mori, Naomichi
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            – D: 01
              M: 01
              Type: published
              Y: 2017
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