Three-Dimensional Photoelastic Analysis of Aeroengine Rotary Parts

1986 ◽  
pp. 209-214
Author(s):  
K. Uchino ◽  
T. Kamiyama ◽  
T. Inamura ◽  
K. Simokohge ◽  
H. Aono ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rotary Parts ◽  
Photoelastic Analysis

scholarly journals Photoelastic Analysis of Three-Dimensional Stress Systems using Scattered Light

1940 ◽  
Vol 44 (349) ◽  
pp. 74-88 ◽  
Author(s):  
R. Weller ◽  
J. K. Bussey
Keyword(s):  
Elementary Theory ◽  
Scattered Light ◽  
Three Dimensional ◽  
Plane Section ◽  
Stress System ◽  
Principal Stresses ◽  
State Of Stress ◽  
Polarised Light ◽  
Photoelastic Analysis ◽  
Good Agreement

SummaryA method has been developed for making photoelastic analyses of threedimensional stress systems by utilising the polarisation phenomena associated with the scattering of light. By this method, the maximum shear and the directions of the three principal stresses at any point within a model can be determined, and the two principal stresses at a free-bounding surface can be separately evaluated. Polarised light is projected into the model through a slit so that it illuminates a plane section. The light is continuously analysed along its path by scattering and the state of stress in the illuminated section is obtained. By means of a series of such sections, the entire stress field may be explored. The method was used to analyse the stress system of a simple beam in bending. The results were found to be in good agreement with those expected from elementary theory.

Photoelastic Investigation of a Thick Plate With a Transverse Crack

1975 ◽  
Vol 42 (1) ◽  
pp. 9-14 ◽  
Author(s):  
G. Villarreal ◽  
G. C. Sih ◽  
R. J. Hartranft
Keyword(s):  
Plane Stress ◽  
Thick Plate ◽  
Three Dimensional ◽  
Stress Variation ◽  
Thick Plates ◽  
Stress Components ◽  
Photoelastic Investigation ◽  
Photoelastic Analysis ◽  
Moderately Thick Plates ◽  
Transverse Variation

The purpose of this investigation was to experimentally test one of the assumptions of a recent modified version of the theory of generalized plane stress. The form postulated by the theory for the stress variation through the thickness of a plate containing a crack will be compared with that obtained by three-dimensional photoelastic analysis. Specimens covering the range from thin to moderately thick plates were examined by the frozen stress technique. The experimentally measured transverse variation of the in-plane stress components σx and σy was in excellent agreement with that postulated by the theory.

Stresses at offset-oblique holes in thick-walled cylinders subjected to torsional loading

1980 ◽  
Vol 15 (4) ◽  
pp. 175-182 ◽  
Author(s):  
P Stanley ◽  
B V Day
Keyword(s):  
Shear Stress ◽  
Maximum Stress ◽  
Elastic Stress ◽  
Three Dimensional ◽  
Outer Edge ◽  
Torsional Loading ◽  
Stress Concentrations ◽  
Wide Range ◽  
Photoelastic Analysis ◽  
Geometric Variables

The paper describes a three-dimensional photoelastic analysis of a series of Araldite models, each containing five or six different offset-oblique holes positioned in such a way that there were no ‘interaction’ effects between neighbouring holes. The geometric parameters defining a hole were varied systematically and the elastic stress distribution around the outer edge of each hole was obtained. The stress data are presented in non-dimensional form in terms of the shear stress in a plain cylinder. The dependence of the maximum stress on the geometric variables is discussed and it is shown that the stress concentrations for a wide range of hole/cylinder parameters can be reasonably well predicted from flat plate data. In some cases the predictions are unconservative.

Three-dimensional photoelastic analysis in axially loaded thick plate with hole

1973 ◽  
Vol 8 (3) ◽  
pp. 220-227 ◽  
Author(s):  
N A Rubayi ◽  
V Yadava
Keyword(s):  
Circular Hole ◽  
Thick Plate ◽  
Maximum Stress ◽  
Three Dimensional ◽  
Tensile Loading ◽  
Stress Concentrations ◽  
Precise Location ◽  
Stress Variation ◽  
Photoelastic Analysis ◽  
Different Thickness

In this study three-dimensional photoelasticity is used to analyse the stress variation through different layers of a thick plate containing a circular hole and subjected to uniform tensile loading. The effect of the thickness/diameter ratios on the stress concentrations with thickness is investigated. The experimental results are correlated with the existing three-dimensional theoretical solutions. The data establish, both experimentally and theoretically, the precise location of the maximum-stress layers in plates having different thickness/diameter ratios and thus resolves the discrepancies which existed in previous studies.

Report 16: Photoelastic Analysis of Journal Bearings: Preliminary Investigations

1967 ◽  
Vol 182 (7) ◽  
pp. 90-94
Author(s):  
R. W. T. Preater
Keyword(s):  
Pressure Distribution ◽  
Three Dimensional ◽  
Stress Distributions ◽  
Freezing Cycle ◽  
Photoelastic Analysis ◽  
Loading Tests ◽  
Dynamic Loading Conditions ◽  
Time Of Presentation ◽  
The City

Determination of the stress distributions associated with composite shell bearings under static and dynamic loading conditions is discussed briefly. Experimental work recently started at The City University, using the three-dimensional ‘frozen stress’ photoelastic technique, is described. Preliminary static loading tests have been carried out over a range of low temperatures, prior to stress freezing, on a simple bearing and shaft assembly made in Araldite. One successful stress freezing cycle has been completed and the pressure distribution at the point of stress freezing is shown compared with low temperature distributions for a constant duty parameter. It is anticipated that, at the time of presentation of this report, the stress distribution at the lubrication surface, as determined by analysis, may be shown compared with the recorded pressure distribution.

Three-Dimensional Analysis of Hypoid Gears

1971 ◽  
Vol 93 (4) ◽  
pp. 1275-1279
Author(s):  
I. M. Daniel
Keyword(s):  
Three Dimensional ◽  
Gear Pair ◽  
Stress Distributions ◽  
Hypoid Gear ◽  
Hypoid Gears ◽  
Load Distributions ◽  
Loading Device ◽  
Freezing Cycle ◽  
Photoelastic Analysis ◽  
Set Up

A three-dimensional photoelastic analysis using the stress-freezing and slicing techniques was conducted to obtain stress and load distributions in a hypoid gear pair. Precise full-scale plastic models of a gear and pinion were manufactured. A special mounting fixture was designed and built of the same photoelastic plastic as that used for the model. A set-up gage was also designed and manufactured for gaging the gear and pinion settings. Fine adjustments were made by means of shims. The desired contact, calculated to produce maximum fillet stresses, was checked with a marking compound and gaged with a stock-dividing gage. A loading device was used to apply pure torque to the pinion. The assembled model was loaded and taken through the stress-freezing cycle. Subsequently, the teeth under engagement were sliced and analyzed to obtain contact and fillet stress distributions.

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