Accession Number : ADA309661

Title :   Stress Intensity Magnification for Deep Surface Cracks in Sheets and Plates.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Anderson, Robert B. ; Holms, Arthur G. ; Orange, Thomas W.

PDF Url : ADA309661

Report Date : OCT 1970

Pagination or Media Count : 56

Abstract : The Irwin stress intensity factor for surface cracks with crack depths less than half the plate thickness is extended to cases of relatively deep cracks by including the effect of the free surface opposite the crack. The stress intensity magnification factor is given as a function of applied load, crack length, crack depth, sheet thickness, yield strength, and Poisson's ratio. The combinations of these variables for which the plastic zone extends completely through the thickness are also predicted. The range of applicability of the analysis to surface-crack specimen data was investigated in terms of crack-depth-to-specimen-thickness ratio and crack depth-to-length ratio.

Descriptors :   *CRACK PROPAGATION, CRACKS, TOUGHNESS, STRENGTH(MECHANICS), FRACTURE(MECHANICS), PLATES, SHEETS, AEROSPACE CRAFT, PLASTIC PROPERTIES, YIELD STRENGTH, POISSON RATIO, STRESS CONCENTRATION.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE