A review of crack propagation under unsteady loadingThe theories and research current available on crack propagation under unsteady loadings, especially those of acoustic origin, are reviewed. Since the original theories on fatigue failure did not account for random loading conditions, modified theories which provide statistical methods for evaluating the random loading have emerged. The impact of acoustic fatigue in the aerospace industry, basic principles such as fatigue crack initiation and propagation and load interactions, and testing procedures are discussed. Attention is also given to metal and metal alloy structures, fiber-reinforced composites and nonmetallic structures, short crack growth, and the effects of temperature, moisture, and corrosion on structures. Suggestions for future research in this field are presented, namely, studies on the effect of 'snap-through' response and associated crack growth patterns, studies in microcrack and 'small crack'; propagation under unsteady loading conditions, and the development of an accurate analytical model to predict acceleration and retardation effects in fatigue crack growth under random loading conditions.
Document ID
19930035210
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bryan, H. H. (NASA Kennedy Space Center Cocoa Beach, FL; Georgia Inst. of Technology, Atlanta, United States)
Ahuja, K. K. (Georgia Inst. of Technology Atlanta, United States)