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 language | English |
|---|---|
| Title of host publication | ESAFORM 2016: Proceedings of the 19th International ESAFORM Conference on Material Forming |
| Publisher | American Institute of Physics |
| Pages | - |
| Volume | 1769 |
| ISBN (Electronic) | 9780735414273 |
| DOIs | |
| Publication status | Published - 27 Apr 2016 |
| Event | ESAFORM 2016: 19th International ESAFORM Conference on Material Forming - Nantes, France Duration: 27 Apr 2016 → 29 Apr 2016 Conference number: 19 |
Publication series
| Name | |
|---|---|
| Publisher | AIP |
Conference
| Conference | ESAFORM 2016 |
|---|---|
| Abbreviated title | ESAFORM |
| Country | France |
| City | Nantes |
| Period | 27/04/16 → 29/04/16 |
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Keywords
- METIS-319220
- IR-102370
Cite this
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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 proceeding › Conference contribution › Academic › peer-review
TY - GEN
T1 - Gradient Enhanced Physically Based Plasticity: Implementation and Application to a Problem Pertaining Size Effect
T2 - Implementation and application to a problem pertaining size effect
AU - Perdahcioglu, Emin Semih
AU - Soyarslan, C.
AU - van den Boogaard, Antonius H.
AU - Bargmann, S.
PY - 2016/4/27
Y1 - 2016/4/27
N2 - 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.
AB - 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.
KW - METIS-319220
KW - IR-102370
UR - http://www.scopus.com/inward/record.url?scp=84994181975&partnerID=8YFLogxK
U2 - 10.1063/1.4963404
DO - 10.1063/1.4963404
M3 - Conference contribution
VL - 1769
SP - -
BT - ESAFORM 2016: Proceedings of the 19th International ESAFORM Conference on Material Forming
PB - American Institute of Physics
ER -