Accession Number:

AD0259375

Title:

CREEP EXPERIMENTS WITH STEPWISE CHANGES OF THE TENSILE LOAD (DATA ON 5052 A1. ALLOY AT 450 F)

Descriptive Note:

Corporate Author:

STANFORD UNIV CALIF

Personal Author(s):

Report Date:

1960-08-01

Pagination or Media Count:

1.0

Abstract:

A description is given of equipment developed for creep tests carried out in a screw-type tensile testing machine with electrical drive. The load is held constant within 5 lb by a sensitive on-off control of the electrical drive of the testing machine, and stepwise load changes can be realized by an adjustable straingauge bridge. The on-off control of the oven, which is designed for temperatures up to 900 F, keeps the temperature of the gauge length of the specimen constant within 1 F. Temperature measurements are taken by means of thermocouples welded to the specimen. Strain measurements under stable temperature conditions are obtained with the aid of an extensometer equipped with differential transformers. Elongation and temperature of the specimen are recorded continuously or at regular intervals, with an accuracy of 110,000 in. and 1 F, respectively. The report includes creep data for stepwise load changes for Al alloy 5052 at 450 F. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE