STRAIN DISTRIBUTION ON NOTCHED PLATE SPECIMENS AT CREEP TEMPERATURES
Abstract
Resistance strain gages and grids of vapor-deposited metal were evaluated for measuring strains at loading and during creep in plates with edge notches. Foil strain gages mounted with thermal-setting cements remained usable to 0.5% or higher strain at 500 F, but indicated creep was first less than, and later more than, optical-extensometer readings. Indications from gages mounted with ceramic cement drifted 10 mu in./in./hr at 1200 F after several hundred hours at temperature, but agreed with the extensometer to one per cent strain. Qualitative measurements were made during loading (K sub t 1.8 and 3.6) and for creep (K sub t 1.8) of M-470 alloy at 500 F. Plastic strains were too small to determine by the grid lines used. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1962
- Accession Number
- AD0288515
Entities
People
- Howard R. Voorhees
- James W. Freeman
Organizations
- University of Michigan