Benchmark notch test for life predictionAircraft gas turbine engine components are subjected to severe stress, temperature, and environmental conditions. Economic and reliabilty demands have prompted inordinate effort in development of analytic methods to predict stresses and strains in aircraft engines. There remains, however, the need to check or verify these analytical methodologies against actual experimental data measurements. The laser interferometric strain displacement gage was recognized as having the potential to accomplish this task and was employed in this program. The actual strains incurred at the root of a discontinuity in cyclically loaded test samples subjected to inelastic deformation at high temperature where creep deformation readily occur were measured. The steady-state, cyclic stress-strain response at the root of the discontinuity in the tested samples was analyzed for comparison with the measured results. A comprehensive set of local notch root strain measurements for a variety of load patterns in an Inconel 718 notch specimen at 649 C (1200 F) was obtained and documented using the laser interferometric strain displacement gage.
Document ID
19850002645
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Domas, P. A. (General Electric Co. Cincinnati, OH, United States)
Yau, J. (General Electric Co. Cincinnati, OH, United States)
Sharpe, W. N. (Louisiana State Univ. Baton Rouge, United States)
Ward, M. (Louisiana State Univ. Baton Rouge, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1982
Publication Information
Publication: NASA. Lewis Research Center Turbine Eng. Hot Sect. Technol. (HOST)