Gradient Enhanced Physically Based Plasticity: Implementation and Application to a Problem Pertaining Size Effect: Implementation and application to a problem pertaining size effect

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

3 Citations (Scopus)

Abstract

A physically based plasticity model is implemented which describes work hardening of a material as a function of the total dislocation density. The local part of the model, which involves statistically stored dislocations (SSDs) only, is based on Bergström's original model. The nonlocal part is based on geometrically necessary dislocations (GNDs) which appear and evolve due to existence of large plastic strain gradients. The evolution of GNDs with respect to strain gradients is described based on the flow theory. The gradients are computed explicitly using the converged plastic strain field and the coupling is achieved using a staggered (weak) approach. Gradient computation is carried out using an effcient algorithm that makes use of plastic strain increments at integration points whose arrangement is not necessarily regular. The algorithm is applied on a void growth problem in which high strain gradients occur around the void due to stress concentrations.

Original languageEnglish
Title of host publicationESAFORM 2016: Proceedings of the 19th International ESAFORM Conference on Material Forming
PublisherAmerican Institute of Physics
Pages-
Volume1769
ISBN (Electronic)9780735414273
DOIs
Publication statusPublished - 27 Apr 2016
EventESAFORM 2016: 19th International ESAFORM Conference on Material Forming - Nantes, France
Duration: 27 Apr 201629 Apr 2016
Conference number: 19

Publication series

Name
PublisherAIP

Conference

ConferenceESAFORM 2016
Abbreviated titleESAFORM
CountryFrance
CityNantes
Period27/04/1629/04/16

Fingerprint

plastic properties
gradients
plastics
voids
flow theory
work hardening
stress concentration

Keywords

  • METIS-319220
  • IR-102370

Cite this

Perdahcioglu, E. S., Soyarslan, C., van den Boogaard, A. H., & Bargmann, S. (2016). Gradient Enhanced Physically Based Plasticity: Implementation and Application to a Problem Pertaining Size Effect: Implementation and application to a problem pertaining size effect. In ESAFORM 2016: Proceedings of the 19th International ESAFORM Conference on Material Forming (Vol. 1769, pp. -). [160011] American Institute of Physics. https://doi.org/10.1063/1.4963404, https://doi.org/10.1063/1.4963554
Perdahcioglu, Emin Semih ; Soyarslan, C. ; van den Boogaard, Antonius H. ; Bargmann, S. / Gradient Enhanced Physically Based Plasticity: Implementation and Application to a Problem Pertaining Size Effect : Implementation and application to a problem pertaining size effect. ESAFORM 2016: Proceedings of the 19th International ESAFORM Conference on Material Forming. Vol. 1769 American Institute of Physics, 2016. pp. -
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abstract = "A physically based plasticity model is implemented which describes work hardening of a material as a function of the total dislocation density. The local part of the model, which involves statistically stored dislocations (SSDs) only, is based on Bergstr{\"o}m's original model. The nonlocal part is based on geometrically necessary dislocations (GNDs) which appear and evolve due to existence of large plastic strain gradients. The evolution of GNDs with respect to strain gradients is described based on the flow theory. The gradients are computed explicitly using the converged plastic strain field and the coupling is achieved using a staggered (weak) approach. Gradient computation is carried out using an effcient algorithm that makes use of plastic strain increments at integration points whose arrangement is not necessarily regular. The algorithm is applied on a void growth problem in which high strain gradients occur around the void due to stress concentrations.",
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Perdahcioglu, ES, Soyarslan, C, van den Boogaard, AH & Bargmann, S 2016, Gradient Enhanced Physically Based Plasticity: Implementation and Application to a Problem Pertaining Size Effect: Implementation and application to a problem pertaining size effect. in ESAFORM 2016: Proceedings of the 19th International ESAFORM Conference on Material Forming. vol. 1769, 160011, American Institute of Physics, pp. -, ESAFORM 2016, Nantes, France, 27/04/16. https://doi.org/10.1063/1.4963404, https://doi.org/10.1063/1.4963554

Gradient Enhanced Physically Based Plasticity: Implementation and Application to a Problem Pertaining Size Effect : Implementation and application to a problem pertaining size effect. / Perdahcioglu, Emin Semih; Soyarslan, C.; van den Boogaard, Antonius H.; Bargmann, S.

ESAFORM 2016: Proceedings of the 19th International ESAFORM Conference on Material Forming. Vol. 1769 American Institute of Physics, 2016. p. - 160011.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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