Accession Number:

ADA291131

Title:

Stress Intensity Factors and Crack Mouth Openings for Bridged Cracks Emanating from Circular Holes,

Descriptive Note:

Corporate Author:

DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)

Personal Author(s):

Report Date:

1994-07-01

Pagination or Media Count:

69.0

Abstract:

Muskhelishvilis method of complex potentials has been applied to the problems of one crack, and two diametrically opposed symmetrical cracks emanating from a circular hole of radius R, subjected to a biaxial load. The cracks of length a, are orthogonal to the principal applied stress omega, with transverse stress omega lambdaomega.This work extends previous work through the inclusion of linear springs with spring constant k bridging the crack opening. Analysis focussed on the normalized design parameters of crack tip stress intensity factor Fn and crack mouth opening Vn. Their dependencies on biaxiality lambda, normalized spring stiffness ka, and the geometry specified by an aa R, were investigated. Interpolation formulae with parameters depending on were fitted to the high and low ka limits of Fn and Vn. These provided a simple means for calculating Fn and Vn, in most cases to within a few percent of the numerically calculated values. An interesting comparison of the symmetrically cracked hole to the partially bridged centre crack, showed that the latter had a lower stress intensity factor in all but the very short crack cases. AN

Subject Categories:

  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE