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
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.