Accession Number : ADA020133

Title :   The Mechanics of Near Surface Inclusions and Their Effect on Fatigue Life.

Descriptive Note : Final rept. 1 Jan 73-31 Dec 75,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TEX

Personal Author(s) : Francis,Philip H.

Report Date : 31 DEC 1975

Pagination or Media Count : 8

Abstract : This program was designed to focus efforts in analytical mechanics and physical metallurgy, interactively, to learn more about the way in which inclusions catalyze the crack initiation process. The analytical mechanics effort was aimed at calculating strain distributions surrounding (a) hemispherical surface inclusions and (b) spherical near-surface inclusions in a half-space subjected to arbitrary tractions. The metallurgical work addressed the problem of describing the initiation process through replica microscopy techniques applied to fatigue cycled specimens.

Descriptors :   *Fatigue(Mechanics), *Aluminum alloys, *Steel, Defects(Materials), Fracture(Mechanics), Crack propagation, Surfaces, Microscopy, Microstructure, Cracking(Fracturing), Strain(Mechanics)

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE