Damage Tolerant Design of Turbine Engine Disks

This paper describes a USAF sponsored effort to develop, apply, test, and evaluate Pratt & Whitney's Damage Tolerant Design System for cold-section gas turbine engine disks. The design system includes a Damage Tolerance Specification proposed for new USAF engine programs, material characterization for crack- growth behavior, design procedures, and analytical life prediction methodology for consideration of large flaws. To evaluate and refine the design system, a current engine fan disk was redesigned to operate safely for a specified time after the occurrence of 0. 030-inch (0.76 mm) surface length fatigue cracks. The redesigned disk was tested to failure while monitoring crack growth and correlating observed measurements with analytical prediction. Test results were used to refine the design system. Current work involves extending Damage Tolerant Design capability to hot-section powder-metallurgy disks. The impact of these efforts is twofold; current designs will benefit from improved life prediction capability in applying Retirement-for-Cause philosophy, and future designs can take advantage of the Life-Cycle-Cost benefit of designing for damage tolerance. criterion. Under this criterion, all components of a given popula- tion are considered to be unsafe as soon as a crack of some finite size (defined by the NDE detection capability) has formed in the statistically few members of the population which have minimum fatigue properties. No attempt is made to utilize the life as- sociated with the remaining population members which have statistically higher fatigue properties and are therefore not cracked. In addition, no attempt is made to optimize the design for slow crack growth except for consideration of internal mate- rial flaws (the first disk application of fracture mechanics techni-ques).

• Publication year

  1982

• Venue

  Unknown venue

• Publication date

  1982-04-18

• Fields of study

  Materials Science, Engineering

• Identifiers
  DOI 10.1115/82-GT-311
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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