A. Eftekhari et al., INFLUENCE OF SURFACE CONDITION ON THE FATIGUE OF AN ALUMINUM-LITHIUM ALLOY (2090-T3), Materials science & engineering. A, Structural materials: properties, microstructure and processing, 199(2), 1995, pp. 3-6
This report examines the axial fatigue life data of the shot peened an
d unpeened 2090-T3 aluminum-lithium alloy. The effect of shot peening
on life was detrimental and insignificant at higher and lower stresses
respectively. This life variation is discussed in terms of crack init
iation and, subsequently, such shot peened induced surface characteris
tics as the surface roughness and the surface compressive residual str
ess. The former eases cracking at all stresses; the latter, on the oth
er hand, offers an opposing effect which was noted to be most signific
ant at low stresses and minimal at high stresses. The life was conceiv
ed to depend on the way these factors respond to applied stress.