User menu

Accès à distance ? S'identifier sur le proxy UCLouvain

The coalescence of voids in prestrained notched round copper bars

Primary tabs

Pardoen, Thomas [UCL] Delannay, Francis [UCL]

Notched round copper bars are prestrained to various extents, recrystallized, and finally strained until fracture. Void nucleation and growth during prestraining cause a decrease in the macroscopic void coalescence strain. Modelling of this experiment requires a proper account of the changes in void sizes and their interdistances during prestraining. Modelling based on the Gurson-Leblond-Perrin model for void growth and the Thomason model for void coalescence is proposed. Comparison with experimental results allows a demonstration of the validity of the Thomason model and the inadequacy of models based on a critical porosity value. Porosity at coalescence is found to depend on the initial void volume fraction, the how properties and the stress state.

Document type Article de périodique (Journal article)
Publication date 1998
Language Anglais
Journal information "Fatigue & Fracture of Engineering Materials and Structures" - Vol. 21, no. 12, p. 1459-1472 (1998)
Peer reviewed yes
Publisher Blackwell Science Ltd (Oxford)
issn 8756-758X
Publication status Publié
Affiliation UCL - FSA/MAPR - Département des sciences des matériaux et des procédés
Keywords void nucleation ; void growth ; void coalescence ; strain hardening ; microstructure
Links
  1. Rice J.R., Tracey D.M., On the ductile enlargement of voids in triaxial stress fields∗, 10.1016/0022-5096(69)90033-7
  2. Gurson A. L., Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I—Yield Criteria and Flow Rules for Porous Ductile Media, 10.1115/1.3443401
  3. Tvergaard V, Int. J. Fracture, 17, 389 (1981)
  4. Leblond J.-B, Eur. J. Mech. A/Solids, 14, 499 (1995)
  5. Koplik J, Int. J. Solids Structures, 24, 835 (1990)
  6. Needleman A, Eur. J. Mech. A Solids, 9, 193 (1990)
  7. Xia L, A computational approach to ductile crack growth under large scale yielding conditions, 10.1016/0022-5096(94)00069-h
  8. Worswick M, Void growth and constitutive softening in a periodically voided solid, 10.1016/0022-5096(90)90025-y
  9. Richelsen AB, Acta Metall. Mater., 42, 2561 (1994)
  10. Becker R., The effect of porosity distribution on ductile failure, 10.1016/0022-5096(87)90018-4
  11. Magnusen PE, Acta Metall., 36, 1503 (1988)
  12. 12A Pineau, 1992 Global and local approaches of fracture-Transferability of laboratory test results to components. InTopics in Fracture and Fatigue(Edited by A. S. Argon), Springer, pp. 197-234.
  13. Thomason PF, Acta Metall. Mater., 41, 2127 (1993)
  14. Becker R, Acta Metall., 37, 99 (1989)
  15. Chu CC, J. Engng Mater. Tech., 102, 249 (1980)
  16. Fleck NA, Adv. Appl. Mech., 33, 295 (1997)
  17. Thomason P.F., Three-dimensional models for the plastic limit-loads at incipient failure of the intervoid matrix in ductile porous solids, 10.1016/0001-6160(85)90201-9
  18. Thomason P.F., A three-dimensional model for ductile fracture by the growth and coalescence of microvoids, 10.1016/0001-6160(85)90202-0
  19. 19PF Thomason, 1990 Ductile Fracture of Metals, Pergamon Press, Oxford
  20. 20PW Bridgman, 1952 Studies in large plastic flow and fracture,Metallurgy and Metallurgical Engineering Series(Edited by R. F. Mehl), McGraw-Hill, New York.
  21. 21T Pardoen, 1998 Ductile fracture of cold-drawn copper bars: experimental investigation and micromechanical modelling. Ph.D. dissertation, Universite catholique de Louvain, Belgium.
  22. 22A Benzerga, J Besson, and A Pineau, 1997 Modele couple comportement-endommagement ductile de toles anisotropes.3eme Colloque National en Calcul des Structures, 20-23 May 1997, Giens, France.
  23. 23RT de Hoff, and FN Rhines, 1972 Microscopie Quantitative, Masson
  24. Spitzig W.A., Kelly J.F., Richmond O., Quantitative characterization of second-phase populations, 10.1016/0026-0800(85)90045-x
  25. Pardoen T., Doghri I., Delannay F., Experimental and numerical comparison of void growth models and void coalescence criteria for the prediction of ductile fracture in copper bars, 10.1016/s1359-6454(97)00247-4
  26. Beremin FM, Metall. Trans. A, 12, 723 (1981)
  27. 27R Chaouadi, 1996 Micromechanically based damage modeling of crack initiation in reactor materials. Ph.D. dissertation, Katholieke Universiteit Leuven and SCKCEN, Belgium.
  28. 28L Bauvineau, 1996 Approche locale de la rupture ductile: application a un acier carbone-manganese. Ph.D. dissertation, Ecole Nationale Superieure des Mines de Paris, France.
  29. Le Roy G, Acta Metall., 29, 1509 (1981)
  30. Pardoen T, Metall. Mater. Trans. A, 29, 1895 (1998)
  31. Duva JM, Mech. Mater., 3, 41 (1984)
  32. Perrin G, Int. J. Plast., 6, 677 (1990)
  33. Norris D.M., Moran B., Scudder J.K., Quiñones D.F., A computer simulation of the tension test, 10.1016/0022-5096(78)90010-8
  34. Bourcier R.J., Koss D.A., Smelser R.E., Richmond O., The influence of porosity on the deformation and fracture of alloys, 10.1016/0001-6160(86)90147-1
  35. Becker R., Smelser R. E., Richmond O., Appleby E. J., The effect of void shape on void growth and ductility in axisymmetric tension tests, 10.1007/bf02651652
  36. Sovik OP, Fatigue Fract. Engng Mater. Struct., 20, 1731 (1997)
Bibliographic reference Pardoen, Thomas ; Delannay, Francis. The coalescence of voids in prestrained notched round copper bars. In: Fatigue & Fracture of Engineering Materials and Structures, Vol. 21, no. 12, p. 1459-1472 (1998)
Permanent URL http://hdl.handle.net/2078.1/44562