Accession Number : AD0476370

Title :   A STUDY OF THE EFFECT OF SUPERIMPOSED STRESS CONCENTRATIONS.

Descriptive Note : Final rept. 1 Apr 64-31 Mar 65,

Corporate Author : SYRACUSE UNIV NY DEPT OF CHEMICAL ENGINEERING AND METALLURGY

Personal Author(s) : Weiss, V. ; Takimoto, A. ; Sessler, J.

Report Date : OCT 1965

Pagination or Media Count : 97

Abstract : The interaction effects of the stress fields of edge notches and holes or elongated slots have been studied by photoelasticity techniques, in an effort to obtain the basic information required for a fracture analysis of inhomogeneous brittle materials such as ceramics. Actual fracture tests on selected similar geometries were conducted on a brittle titanium alloy to provide an experimental check on the stress analysis and photoelastic work. Both one sided and mutual interaction of the stress fields of the edge notches and holes were observed and their occurrence depends upon the geometry and proximity of the two stress concentrators. The photoelastic results revealed that a simplified uniaxial stress distribution analysis predicts far larger interaction distances than were actually observed. Consideration of the stress field biaxiality together with a more accurate stress distribution analysis is required for a quantitative prediction of the observed effects. A unified interpretation of the interaction effects can be obtained from a graph of stress concentration factor increase versus the relative interflaw spacing xi/r, where r is the root radius of the neighboring notch. (Author)

Descriptors :   *CERAMIC MATERIALS), (*STRESSES, PHOTOELASTICITY, FRACTURE(MECHANICS), BRITTLENESS, TITANIUM ALLOYS, MATHEMATICAL PREDICTION, TENSILE PROPERTIES, TEMPERATURE, CRYSTAL DEFECTS, FAILURE(MECHANICS), PLASTICS, HEAT TREATMENT, ELASTIC PROPERTIES.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE