Abstract
Major disk design criteria are identified with emphasis on the life limiting design and the application of life prediction techniques. Design for low-cycle fatigue (LCF) capability includes consideration of operator usage, material characteristics, temperature, and stress analysis. Analytical stress analysis methods are discussed and related to experimental testing of both specimen and full-scale components. The role of initiation time in the total component life is discussed with emphasis given to analytical techniques, including finite element, finite difference, and the role of stress concentrations on fatigue life. The fatigue life initiation system and its inter-relationship with the flight profile including the effects of time, temperature, stress, and material characteristics are highlighted. Attention is focused on the role of crack propagation in the disk design system including the design of disks for internal defects. The general role of fatigue crack propagation and subcritical flaw growth is highlighted along with the inter-relationship with nondestructive inspection techniques for surface and sub-surface defects. The future of initiation-propagation relationship to total disk life concept is explored in light of improved NDI, advanced fracture mechanics analysis, and the potential for disk retirement for cause.
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