Microcreep of SiC/Al Using Real Time Laser Interferometry,
Abstract
A Silicon Carbide whisker reinforced aluminum rod was subjected to a compressive stress of 6295 psi at 120 F for a total time of 2711.2 hr. The creep strain was measured continuously in air with a laser Michelson interferometer and discontinuously at room temperature with a gauge block comparator. Creep strains after 1,000 to 10,000 hr fall in the 20-40 micro-epsilon range. A random 13% asymmetry in the load application may explain the higher strains measured with the interferometer. The gauge block comparator results may also have been enhanced by a slight growth of the reference sample. Recovery strains may be proportional to creep strains so that the continuous real time creep strains would be expected to be higher than intermittent comparisons.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1984
- Accession Number
- ADA176073
Entities
People
- Ernest G. Wolff
- Raymond C. Savedra
Organizations
- The Aerospace Corporation