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This paper surveys the current state of fatigue-crack research and the effect of this work on structural design. The subject areas discussed include: (1) fatigue-crack growth equations, (2) multiaxial strain effects, (3) temperature effects, (4) frequency effects, (5) anisotropic effects, (6) variable stress field effects, (7) fractography, (8) crack growth under random loads, and (9) critical elements and fracture modes. The current limited application of the available fatigue information to design is recognized. Practical objectives for fatigue research from the standpoint of structural design are itemized.
fatigue (materials), crack propagation, anisotropy, structural design, flight vehicles, aircraft, rockets, missiles
Christensen, R. H.
Chief, Douglas Aircraft Co., Inc., Santa Monica, Calif.
Harmon, M. B.
Design specialist, Douglas Aircraft Co., Inc., Santa Monica, Calif.