FATIGUE LIVES OBTAINED IN RANDOM AND PROGRAM TESTS ON FULL-SCALE WING CENTER SECTIONS

摘要

Fatigue tested was conducted on eight full-locale wing oyster sections of the F-27 Friendship aircraft. The specimen consisted of the tension skin, including all stiffening elements. The remainder of the wing was replied by a dummy structure. Two tests were carried out for each of the following load sequences! (l) Random load (2) programmed load (3) random load with ground-to-air cycles (4) programmed load including ground-to-air cycles. The random loading vas based on a simulation of strain gage records obtained by flying in turbulent air. The primary aim of the investigation was to study the equivalence of random and programmed loadings.