Accession Number:

ADA181243

Title:

Research on Mechanical Properties for Engine Life Prediction

Descriptive Note:

Annual rept. no. 2, Aug 1985-31 Jul 1986

Corporate Author:

DAYTON UNIV OH RESEARCH INST

Report Date:

1987-05-01

Pagination or Media Count:

70.0

Abstract:

Analytical and experimental investigations have been performed to determine crack growth behavior of turbine engine disk and blade alloys under various loading conditions typical of service environments. Tests were performed at elevated temperature in vacuum also to evaluate the baseline crack growth behavior. Substructural analysis of creep rupture specimens were conducted to understand the basic mechanism of time-dependent elevated temperature deformation. The work performed can be divided into three categories-- development of experimental techniques, material characterization techniques, and data maintenance and test support activities. The capability of the IDG laser system to monitor extended gage length was analyzed and found feasible. New grips and specimens have been designed and fabricated for high temperature composite testing. Enhancements to existing systems for crack length and displacement measurements were made. A number of computer automation applications are also discussed. Keywords Laser interferometer system, Compliance, fatigue crack closure Surface crack Fatigue crack growth.

Subject Categories:

  • Properties of Metals and Alloys
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE