Accession Number:

ADA183851

Title:

A Generalized Least-Squares Determination of Triaxial Stress States by X-Ray Diffraction and the Associated Errors.

Descriptive Note:

Technical rept.,

Corporate Author:

NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

• Winholtz,R. A.
• Cohen,J. B.

Report Date:

1987-07-01

Pagination or Media Count:

27.0

Abstract:

The determination of residual stresses via x-ray diffraction is briefly reviewed, with particular emphasis on the triaxial stress state. A new method is proposed for determining the general stress tensor, which considerably reduces the variances of the stresses due to counting statistics and gradients. The procedure involves a generalized least square solution of strains measured at vario us tilts of the x ray beam to the sampled and a set of tilts not heretofore used is recommended to minimize these errors.

Descriptors:

• *TRIAXIAL STRESSES
• *X RAY DIFFRACTION
• *STRESS ANALYSIS
• COUNTING METHODS
• STATISTICS
• DETERMINATION
• LEAST SQUARES METHOD
• RESIDUAL STRESS
• SOLUTIONS(GENERAL)
• TILT

Subject Categories:

• Mechanics
• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE