Accession Number : AD0742662

Title :   An Assessment of Factors Influencing Data Obtained by the Photoelastic Stress Freezing Technique for Stress Fields near Crack Tips,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG COLL OF ENGINEERING

Personal Author(s) : Schroedl,M. A. ; McGowan,J. J. ; Smith,C. W.

Report Date : APR 1972

Pagination or Media Count : 27

Abstract : Factors which influence crack tip stress field data are identified as: (1) Non-linear zone near crack tip due to crack blunting. (2) Normal stress parallel to crack surface. (3) Location of region for data retrieval. The Kolosoff-Inglis solution is used in order to assess effects of crack tip blunting. A set of stress freezing photoelastic experiments are conducted on plates containing through cracks and results are compared with the Westergaard solution in order to assess the effect of Item 2 using appropriate Item 3 locations. A data conditioning computer program is employed to yield accurate values of the stress intensity factor from photoelastic data. (Author)

Descriptors :   (*FRACTURE(MECHANICS), *PHOTOELASTICITY), (*CRACKS, PHOTOELASTICITY), STRESSES, INTENSITY

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE