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The causes and nature of acoustical fatigue are discussed and recent experiences reviewed. The types of acoustical excitation are classified and typical spectral curves indicated. The dynamic response of a structure exposed to an acoustical environment is discussed to indicate the four material and configuration properties which govern fatigue life. The role and importance of each of these properties, particularly structural damping, is appraised. The mechanisms involved in both inherent structural damping and in various types of surface layer additions are analyzed and their potential damping contributions are compared.
Trapp, W. J.
Wright Air Development Division, Wright-Patterson Air Force Base, Dayton, Ohio
Lazan, B. J.
University of Minnesota, Institute of Technology, Minneapolis, Minn