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A rate-independent non-associated constitutive model for finite element simulation of sheet metal forming

Mohsen Safaei (UGent) , Wim De Waele (UGent) and Shun-lai Zang
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Abstract
This paper presents a plane stress anisotropic constitutive model based on a non-associated flow rule (non-AFR) and a one-surface non-linear mixed isotropic-kinematic hardening law. A fully implicit stress update algorithm was used to implement the developed continuum formulation as a user material subroutine (UMAT) into the commercial finite element code ABAQUS. This model is capable of predicting the permanent softening of metals in addition to the Bauschinger effect and transient behavior.
Keywords
Permanent softening, Bauschinger effect, non-linear mixed hardening, non-associated metal plasticity

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Chicago
Safaei, Mohsen, Wim De Waele, and Shun-lai Zang. 2012. “A Rate-independent Non-associated Constitutive Model for Finite Element Simulation of Sheet Metal Forming.” In Plasticity and Its Current Applications, 18th International Symposium, Proceedings, ed. Akhtar Khan, 61–63. Fulton, MD, USA: Numerical Engineering Analysis and Testing (NEAT).
APA
Safaei, M., De Waele, W., & Zang, S. (2012). A rate-independent non-associated constitutive model for finite element simulation of sheet metal forming. In Akhtar Khan (Ed.), Plasticity and its Current Applications, 18th International symposium, Proceedings (pp. 61–63). Presented at the 18th International symposium on Plasticity and its Current Applications (PLASTICITY  ’12), Fulton, MD, USA: Numerical Engineering Analysis and Testing (NEAT).
Vancouver
1.
Safaei M, De Waele W, Zang S. A rate-independent non-associated constitutive model for finite element simulation of sheet metal forming. In: Khan A, editor. Plasticity and its Current Applications, 18th International symposium, Proceedings. Fulton, MD, USA: Numerical Engineering Analysis and Testing (NEAT); 2012. p. 61–3.
MLA
Safaei, Mohsen, Wim De Waele, and Shun-lai Zang. “A Rate-independent Non-associated Constitutive Model for Finite Element Simulation of Sheet Metal Forming.” Plasticity and Its Current Applications, 18th International Symposium, Proceedings. Ed. Akhtar Khan. Fulton, MD, USA: Numerical Engineering Analysis and Testing (NEAT), 2012. 61–63. Print.
@inproceedings{1983212,
  abstract     = {This paper presents a plane stress anisotropic constitutive model based on a non-associated flow rule (non-AFR) and a one-surface non-linear mixed isotropic-kinematic hardening law. A fully implicit stress update algorithm was used to implement the developed continuum formulation as a user material subroutine (UMAT) into the commercial finite element code ABAQUS. This model is capable of predicting the permanent softening of metals in addition to the Bauschinger effect and transient behavior.},
  author       = {Safaei, Mohsen and De Waele, Wim and Zang, Shun-lai},
  booktitle    = {Plasticity and its Current Applications, 18th International symposium, Proceedings},
  editor       = {Khan, Akhtar},
  isbn         = {9780965946308},
  keyword      = {Permanent softening,Bauschinger effect,non-linear mixed hardening,non-associated metal plasticity},
  language     = {eng},
  location     = {San Juan, PR, USA},
  pages        = {61--63},
  publisher    = {Numerical Engineering Analysis and Testing (NEAT)},
  title        = {A rate-independent non-associated constitutive model for finite element simulation of sheet metal forming},
  year         = {2012},
}