Accession Number : AD0776019

Title :   Strain-Energy-Density Factor Applied to Mixed Mode Crack Problems.

Descriptive Note : Technical rept.,

Corporate Author : LEHIGH UNIV BETHLEHEM PA INST OF FRACTURE AND SOLID MECHANICS

Personal Author(s) : Sih,G. C.

Report Date : JAN 1974

Pagination or Media Count : 45

Abstract : The paper deals with the general problem of crack extension in a combined stress field where a crack can grow in any arbitrary direction with reference to its original position. In a situation, when both of the stress-intensity factors, k1, k2 are present along the crack front, the crack may spread in any direction in a plane normal to the crack edge depending on the loading conditions. Preliminary results indicate that the direction of crack growth and fracture toughness for the mixed problem of Mode I and Mode II are governed by the critical value of the strain-energy-density factor, S(cr). The analytical predictions are in good agreement with experimental data on the problem of an inclined crack in plexiglass and aluminum alloy specimens. The result of this investigation provides a convenient procedure for determining the critical crack size that a structure will tolerate under mixed mode conditions for a given applied stress. (Modified author abstract)

Descriptors :   *Fracture(Mechanics), *Crack propagation, *Strain(Mechanics), Elastic properties, Numerical analysis, Aluminum alloys, Plexiglas

Subject Categories : Metallurgy and Metallography
      Plastics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE