A photoelastic study of the stresses in a deep beam using partial mirrors for isochromatic fringe sharpening and fringe multiplication

Author

Edward M. Raney

Abstract

"This paper is a photoelastic investigation of the stresses in a deep beam using partial mirrors to obtain isocromatic fringe sharpening and fringe multiplication. This method may be of particular value in photoelastic work for obtaining full field fringe multiplication and fringe sharpening for models which exhibit low fringe orders.

The photoelastic model used in this investigation is a deep beam with a length to depth ratio of one. A uniform load is applied over the center one-half of the beam. The beam is supported by two uniform loads distributed over a length of one-quarter the span.

A first approximation to a uniform load is obtained by using a rigid loading block and rigid supports. Rubber cushions are used at all contact surfaces. This is done to minimize any eccentricity of applied loads and to minimize stress concentrations.

The partial mirrors are placed on each side of the model and the multiplied fringe pattern photographed. The partial mirrors are then removed and the unmultiplied fringe patterns photographed. Photographs showing unmultiplied, multiplied, and sharpened fringe patterns are presented.

The shear difference method is used to analyze the multiplied fringe pattern data. The resulting stress distribution is compared with the theoretical stress distribution given by Tritz"--Abstract, page ii.

Advisor(s)

Parry, Myron G.

Committee Member(s)

Davidson, Robert F., 1911-1971
Schowalter, Ralph E., 1923-2001
Heagler, John B., 1924-1999
Andrews, William A., 1922-2009

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Engineering Mechanics

Publisher

University of Missouri at Rolla

Publication Date

1966

Pagination

vii, 54 pages

Note about bibliography

Includes bibliographical references (page 53).

Rights

© 1966 Edward M. Raney, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

PhotoelasticityStress concentration -- Mathematical modelsShear (Mechanics)

Thesis Number

T 1874

Print OCLC #

5973544

Electronic OCLC #

896879276

Recommended Citation

Raney, Edward M., "A photoelastic study of the stresses in a deep beam using partial mirrors for isochromatic fringe sharpening and fringe multiplication" (1966). Masters Theses. 5747.
https://scholarsmine.mst.edu/masters_theses/5747