Comparison between Lemaitre and Gurson damage models in crack growth simulation during blanking process

Abstract In this paper, the numerical results obtained by a finite element analysis in the case of sheet metal blanking process are compared with the experimental ones to verify the validity of Gurson and Lemaitre damage models in describing the initiation and propagation of cracks during the process evolution. The concept of continuum damage mechanics has been retained to describe the progressive damage accumulation into the sheet metal leading to the final rupture. During the analysis, the crack propagation is simulated by the propagation of a completely damaged area. The comparative study of the results obtained by simulations using different damage models and experimental ones, showed that Gurson damage model is not able to predict the fracture propagation path in a realistic way. Only Lemaitre damage model gives good results.

[1]  William T. Carter.  A Model for Friction in Metal Forming , 1994 .

[2]  V. G. Wong,et al.  Analysis of Stresses in Bar Cropping , 1975 .

[3]  Cv Clemens Verhoosel,et al.  Non-Linear Finite Element Analysis of Solids and Structures , 1991 .

[4]  Jose Couto Marques,et al.  Stress computation in elastoplasticity , 1984 .

[5]  J. Chaboche,et al.  PHENOMENOLOGICAL ASPECTS OF CONTINUUM DAMAGE MECHANICS , 1989 .

[6]  Viggo Tvergaard,et al.  Mechanical modelling of ductile fracture , 1991 .

[7]  A. Gurson.  Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I—Yield Criteria and Flow Rules for Porous Ductile Media , 1977 .

[8]  A. Atkins,et al.  On cropping and related processes , 1980 .

[9]  A. J. Organ,et al.  Deformation in the ductile fracture processes examined by the visioplasticity method , 1973 .

[10]  J. Chaboche,et al.  On the creep crack-growth prediction by a non local damage formulation , 1989 .

[11]  G. Widera,et al.  Handbook of Metal Forming , 1985 .

[12]  Y. Liu,et al.  Mesh-dependence and stress singularity in finite element analysis of creep crack growth by continuum damage mechanics , 1994 .

[13]  Ridha Hambli,et al.  Finite element model fracture prediction during sheet-metal blanking processes , 2001 .

[14]  J. Lemaître.  A CONTINUOUS DAMAGE MECHANICS MODEL FOR DUCTILE FRACTURE , 1985 .

[15]  Ridha Hambli,et al.  Finite element modeling of sheet-metal blanking operations with experimental verification , 2000 .

[16]  Morten Rikard Jensen,et al.  Applying the finite-element method for determination of tool wear in conventional deep-drawing , 1998 .

[17]  S. R. S. Kalpakjian.  Manufacturing Processes for Engineering Materials , 1984 .

[18]  N. S. Ong,et al.  Effect of punch clearance in the high-speed blanking of thick metals using an accelerator designed for a mechanical press , 1989 .