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...

The effect of the sheet width on the fatigue crack propagation in 2024-T3 Alclad material

The size effect on crack propagation was studied with sheet specimens of 2024-T3 Alclad. Values of the width were 80, 160, 300 and 600 mm, sheet thickness 3 mm, mean stress 8 kg/mm2 and stress amplitudes 2.5, 4 and 6.5 kg/mm2. Results are compared with the theory of the stress intensity factor and the Weibull theory. Practical implications of...

Programme-fatigue tests on aluminium alloy lug specimens with slotted holes and expanded holes

Constant-amplitude tests and programme tests were carried out on 2024-T3 lug specimens with standard holes, slotted holes and expanded holes. The results give information on (1) programme loading versus constant-amplitude loading, (2) cumulative damage and (3) the improvement of the fatigue endurance obtained by the application of slotted and 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.

Fatigue tests on aluminium alloy lugs with special reference to fretting

Fatigue tests have been carried out on light alloy lugs of 2024 and 7075 material in order to investigate the effects of some geometrical parameters (lug size, geometry of lug) and various means to reduce fretting, viz. lubrication of the pin, flattened pins, slotted holes and expanded holes. Complete S-N curves have been determined at a...