Accession Number : AD0689938

Title :   EFFECTIVE CASE DEPTH: UNCERTAINTIES IN MEASUREMENT,

Corporate Author : DEFENCE STANDARDS LABS ALEXANDRIA (AUSTRALIA)

Personal Author(s) : Berry,A. J. ; Mulhearn,T. O.

Report Date : 07 NOV 1968

Pagination or Media Count : 13

Abstract : An examination has been carried out of the sources of uncertainty in the measurement of the effective case depth of surface-hardened steel by using hardness measurements at 1.0-kgf and 0.5-kgf loads. It is shown that the probability of error in the measurement of load and the length of the indentation is relatively small. In the most useful range of the method, this uncertainty is unlikely to exceed plus or minus 0.004 inch, while the overall uncertainty is unlikely to exceed plus or minus 0.012 inch. The most important source of uncertainty is scatter in hardness readings, which occurs at low loads. (Author)

Descriptors :   (*STEEL, CASE HARDENING), HARDNESS, STATISTICAL ANALYSIS, TEST METHODS, AUSTRALIA

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE