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A non‐destructive method to determine stresses in a three‐dimensional photoelastic model using a transmission polariscope
Author(s) -
Keshavan S. Y.
Publication year - 1982
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.1982.tb00423.x
Subject(s) - photoelasticity , transmission (telecommunications) , optics , point (geometry) , stress (linguistics) , set (abstract data type) , materials science , computer science , engineering , mathematics , solid mechanics , geometry , physics , composite material , electrical engineering , linguistics , philosophy , programming language
The determination of stresses within a loaded three dimensional photoelastic model without cutting it into slices has been the ultimate aim of many investigators. The standard methods using a transmission polariscope do not yield much information. Scattered light methods no doubt enable one to completely determine the state of stress at a point within the body. However, the methods proposed up to now necessitate the use of an arrangement where both the body under test and the sensing unit which picks up the scattered light or both will have to be rotated. This leads to a complicated experimental set‐up and increases the possibility of making errors, especially while rotating the model. In the proposed method, most of the information needed to determine the state of stress at a point within the body is obtained using the transmission polariscope set‐up. The model and the direction of observation of scattered light are fixed. This allows observations to be made in test models which have at least one flat face without using a liquid with matched refractive index and increases the accuracy of measurements. The method is an almost purely transmission polariscope type of method and where space permits tests can be done using ‘live’ loading without having to use the stress freezing technique.