In previous studies of the tightness and flushness of machine—countersunk flush rivets (references 1 to 3) it has been found that, if the countersunk head protrudes above the sheet surface before the rivet is driven, a much tighter riveted joint is obtained than if the counter sunk head is below the sheet surface before the rivet is driven. The purpose of the present investigation is to study the effect of the height of the rivet head on the number of cycles required to cause failure of a machine countersunk flush—riveted joint under a combined static and alternating shear load.
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