Accession Number : AD0288515

Title :   STRAIN DISTRIBUTION ON NOTCHED PLATE SPECIMENS AT CREEP TEMPERATURES

Corporate Author : MICHIGAN UNIV ANN ARBOR

Personal Author(s) : VOORHEES,HOWARD R. ; FREEMAN,JAMES W.

Report Date : AUG 1962

Pagination or Media Count : 1

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)

Descriptors :   *METALS, ALUMINUM ALLOYS, CREEP, DEFORMATION, EXTENSOMETERS, MEASUREMENT, METAL PLATES, PHOTOELASTICITY, RUPTURE, SHEETS, STRAIN GAGES, TEMPERATURE, TEST EQUIPMENT, TEST METHODS, X RAY DIFFRACTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE