INFLUENCE OF COLD-ROLLING AND FATIGUE ON THE RESIDUAL-STRESS STATE OFA METAL-MATRIX COMPOSITE

Citation
E. Hanus et al., INFLUENCE OF COLD-ROLLING AND FATIGUE ON THE RESIDUAL-STRESS STATE OFA METAL-MATRIX COMPOSITE, Journal de physique. IV, 3(C7), 1993, pp. 1817-1820
Citations number
5
Categorie Soggetti
Physics
Journal title
ISSN journal
11554339
Volume
3
Issue
C7
Year of publication
1993
Part
3
Pages
1817 - 1820
Database
ISI
SICI code
1155-4339(1993)3:C7<1817:IOCAFO>2.0.ZU;2-D
Abstract
The large difference in the coefficient of thermal expansion between t he matrix alloy and the particle in a metal matrix composite gives ris e to residual stresses in the material. In the present work the effect of cold rolling and four-point bending fatigue on the residual stress state of a silicon carbide particle reinforced aluminium alloy (AA 20 14) has been investigated. The three dimensional stress state measured in both phases: matrix and reinforcement, has been determined by usin g an X-ray diffraction technique. It was found that cold rolling induc es surface compressive macrostresses of about -250 MPa, with a penetra tion depth around 2 mm. The absolute values of the pseudomacrostresses in both phases are significantly reduced due to the single track roll ing. Stress relaxation occurs during four-point bending fatigue.