FRETTING CRACKING BEHAVIOR ON PRESTRESSED ALUMINUM-ALLOY SPECIMENS

A new testing rig has been developed which enables fretting tests on p re-stressed specimens to be carried out. Three aluminium alloys, AI-LI 2091, AI-Cu 2024 and Al-Zn 7075, were used in the tests. The imposed amplitude D ranged from +/-10 to +/-75 mu m and normal load F-n from 5 00 to 1000 N. The static external stress sigma(s) was set as sigma(D)/ 10, sigma(D)/2 and sigma(D) (sigma(D) is the fatigue limit). The tests were carried out with a frequency of 1 or 5 Hz up to 10(6) cycles. In this paper, analysis of fretting behaviour has been carried out using the fretting map concept. The effect of the axial load (prestress) on fretting cracking is emphasized. Copyright (C) 1996 Elsevier Science Ltd