Interferometric Creep Testing.
Abstract
Compressive microcreep data are increasingly needed for the design of dimensionally stable components and structures. Interferometers are inherently more accurate for such measurements than conventional gauges or transducers. Described is work with Fabry-Perot and Michelson interferometers that led to development of a novel technique applicable to a wide variety of temperature and loading conditions. A finite-element analysis was performed to analyze loading effects on the accuracy of the optical measurements. Preliminary testing with the device indicates a strain sensitivity of about 2 parts in 10 to the 9th power, a strain measurement accuracy of + or - 1.2 parts in 10 to the 8th power, and a system drift rate of <1 part in 10,000,000/100 hr. Under creep conditions, short-term strains will be a result almost entirely of fluctuations in test-sample temperature. Keywords include: Creep, Interferometry, Metrology, dimensional stability, Compression testing, Michelson, and Fabry-Perot.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1985
- Accession Number
- ADA154249
Entities
People
- D. J. Chang
- E. G. Wolff
- R. C. Savedra
Organizations
- The Aerospace Corporation