Accession Number:

AD0263935

Title:

AN OPTICAL TECHNIQUE FOR THE MEASUREMENT OF PLASTIC BENDING STRAINS AT ELEVATED TEMPERATURE

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Report Date:

1961-08-14

Pagination or Media Count:

6.0

Abstract:

IN CONNECTION WITH A STUDY OF HIGH-TEMPERATURE FATIGUE PROPERTIES IN CONTROLLED ENVIRONMENTS, AN OPTICAL METHOD BASED ON THE DETERMINATION OF THE RADIUS OF CURVATURE OF A STRAINED SHEETMETAL SPECIMEN HAS BEEN DEVELOPED FOR MEASURING BENDING STRAINS IN THE PLASTIC RANGE AT 1500 F. In order to establish the accuracy of the method, the optical strain measurements were compared with those made with a resistance strain gage at room temperature on these three materials nickel, Type 316 stainless steel, and Inconel X. At 1500 F, the standard which was chosen for comparison was stress calculations applied to Inconel X. In the current state of evaluation of the technique, the data which are being used for the purpose of reporting fatigue results are considered reliable to five percent. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE