Accession Number : AD0779674

Title :   The Stress Intensity Factor Due to Normal Impact Loading of the Faces of a Crack.

Descriptive Note : Summary rept. Jan-Sep 73,

Corporate Author : BROWN UNIV PROVIDENCE R I DEPT OF ENGINEERING

Personal Author(s) : Freund,L. B.

Report Date : DEC 1973

Pagination or Media Count : 28

Abstract : The plane strain problem of a half-plane crack in an unbounded elastic solid is considered. The faces of the crack are subjected to suddenly applied, equal but opposite concentrated normal forces which tend to separate the crack faces. The elastic wave propagation problem, which contains a characteristic length, is solved exactly by linear superposition over a fundamental solution arising from a particular problem in the dynamic theory of elastic dislocations. Attention is focused on the time-dependent stress intensity factor. For an applied load with step function time dependence, the stress intensity factor is negative from the time the first wave arrives at the crack tip until the arrival of the Rayleigh wave. At that instant, it takes on its appropriate static value, which is thereafter maintained. Generalizations are discussed for spatially distributed and/or time-varying normal impact loads. (Author)

Descriptors :   *Fracture(Mechanics), *Crack propagation, Impact

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE