A STUDY ON THE PREDICTION OF FATIGUE LIFE IN AN AXISYMMETRICAL EXTRUSION DIE

Citation
Sh. Ahn et al., A STUDY ON THE PREDICTION OF FATIGUE LIFE IN AN AXISYMMETRICAL EXTRUSION DIE, Journal of materials processing technology, 71(3), 1997, pp. 343-349
Citations number
16
Categorie Soggetti
Material Science
ISSN journal
09240136
Volume
71
Issue
3
Year of publication
1997
Pages
343 - 349
Database
ISI
SICI code
0924-0136(1997)71:3<343:ASOTPO>2.0.ZU;2-C
Abstract
The present paper gives some results of the fatigue behavior of a typi cal axi-symmetric forward extrusion die. The extrusion process is anal yzed by the rigid-plastic FEM and deformation analysis of the extrusio n die is conducted by the elasto-plastic FEM. To approach the crack pr oblem, LEFM (linear elastic fracture mechanics) is introduced. Using a special element in order to consider the singularity of stress-strain in the vicinity of the crack tip, the stress intensity factor and the effective stress intensity factor are calculated. Applying a proper f atigue crack propagation criterion such as the Paris-Erdogan fatigue l aw and maximum principal criterion to these data, the angle and the di rection of fatigue crack propagation is then simulated. From the resul ts, it is established that the simulated fatigue crack propagates in t he zig-zag path along the radial direction and the fatigue life of the extrusion die is evaluated using the computed crack growth rate. (C) 1997 Elsevier Science S.A.