An assessment of factors influencing data obtained by the photoelastic stress freezing technique for stress fields near crack tips
✍ Scribed by M.A. Schroedl; J.J. McGowan; C.W. Smith
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 863 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
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 photo-NOMENCLATURES Str<_ss components in plane normal to crack horder Polar coordinates measured from crack tip Mode I Stress Intensity Factor Maximum shearing stress in plane perpendicular to crack border Maximum remote shearing stress in plane perpendicular to crack horder Fringe order Material fringe value psi-in./order Normal stress parallel to crack plane Model thickness Crack root radius (Tllr cr Remote uniform stress.