Some tests on the effect of the environment on the propagation of fatigue cracks in aluminium alloys

The investigation on the propagation of fatigue cracks in aluminium alloy sheet under fluctuating tension comprised four parts. (1) Tests to determine the combined effects of the humidity of the air and the lead frequency (clad 2024-T3 and 7075-T6). (2) Tests to determine the effect of water. (3) Tests to determine the effect of wetting with a...

Constant load amplitude and programme fatigue tests on single lap joints in CLAD 2024-T3 and 7075-T6 aluminium alloy with two rows of rivets or huckbolts

Constant load amplitude and programme fatigue tests on single lap joints in clad 2024-T3 and 7075-T6 aluminium alloy with two rows of rivets or Huckbolts

Several single lap Joints in clad 2024-T3 and 7075-T6 alitainium alloy with two rows of rivets or Huclcbolts have been evaluated in respect of their fatigue strength properties, both in tests with constant load amplitude and in tests with a programmed load sequence based on a gust spectrum. The results showed that: 1) The replacement of...

An investigation into the effect of oxygen and watervapour on the propagation of fatigue cracks in 2024-T3 alclad sheet

The propagation has been studied of fatigue cracks in 2024-T3 alclad sheet under fluctuating tension in different atmospheres. Of the principal constituents of air water vapour had a much more severe effect than oxygen; in wet -pure argon the endurance was much shorter than in dry pure oxygen. In air, other circumstances remaining unaltered, the...

The effect of hight temperature stress aging on the fatigue strength of 2024/T alclad double row riveted single lap joints

A comparison has been made between the fatigue strength at fluctuating tension of 2024-T3 alclad double row riveted single lap joints at room temperature in the as fabricated condition and at 150°C after stress-aging at this temperature for 100 hours. The tests showed an appreciable decrease in endurance of the specimens tested at 150°C,...

Tests on the effect of the size of the specimen on the fatigue strength of 2024-T alclad double row riveted single lap joints.

Fatigue tests on 2024-T4 alclad double row riveted single lap joints at fluctuating tension with a mean stress in the nett section of 9.0 kg/mm2 and stress amplitudes ranging from 8.6 to 3.0 kg/mm^ did not show any significant difference in endurance of similar specimens with a size ratio li2,66.