Smoothing of Digital Photoelastic Data Using Robust Outlier Algorithm

2007 ◽  
pp. 87-88 ◽  
Author(s):  
M. Ramji ◽  
K. Ramesh
Keyword(s):  
Photoelastic Data

A Rapid Method for the Determination of Principal Stresses Across Sections of Symmetry From Photoelastic Data

1938 ◽  
Vol 5 (1) ◽  
pp. A24-A28
Author(s):  
M. M. Frocht
Keyword(s):  
Free Boundary ◽  
Rapid Method ◽  
Circular Hole ◽  
Characteristic Curve ◽  
Principal Stresses ◽  
Recent Improvement ◽  
Tangential Stresses ◽  
Circular Holes ◽  
Photoelastic Data

Abstract The author discusses: (a) Mesnager’s theorem of isoclinics, (b) the characteristic curve of tangential stresses across a section of symmetry, (c) a formula for the maximum tangential stresses for the case of a central circular hole between fields of pure tension, (d) the slope of the p curve at a point corresponding to a cupic point, (e) recent improvement in the determination of free boundary stresses, and (f) formulas for the position of cupic points for two cases. A new method for the determination of the principal stresses across sections of symmetry from photoelastic data is illustrated with three examples: (1) Bars in tension or compression with central circular holes, (2) grooved beams in bending, and (3) rings or disks with circular central holes subjected to two concentrated diametral loads.

A review of automated methods for the collection and analysis of photoelastic data

1998 ◽  
Vol 33 (2) ◽  
pp. 75-91 ◽  
Author(s):  
A Ajovalasit ◽  
S Barone ◽  
G Petrucci
Keyword(s):  
Experimental Stress ◽  
Field Methods ◽  
Spectral Content ◽  
Full Field ◽  
Experimental Stress Analysis ◽  
Phase Stepping ◽  
Speed Up ◽  
Photoelastic Data ◽  
The Fourier Transform ◽  
Automated Methods

Photoelasticity is one of the most widely used full-field methods for experimental stress analysis. However, the collection of photoelastic parameters can be a long and tedious process. The advent of automated photoelastic systems has allowed the experimentalists to speed up the rate of analysis and to perform more complex investigations. This paper provides a survey of recent methods of automated photoelasticity developed in the last 20 years, i.e. methods of the fringe centres, half-fringe photoelasticity, phase-stepping photoelasticity, methods based on the Fourier transform, spectral content analysis (SCA) and RGB (red, green, blue) photoelasticity.

Hybrid stress analysis by digitized photoelastic data and numerical methods

1990 ◽  
Vol 30 (2) ◽  
pp. 190-194 ◽  
Author(s):  
H. Mahfuz ◽  
R. O. Case ◽  
T. L. Wong
Keyword(s):  
Numerical Methods ◽  
Stress Analysis ◽  
Photoelastic Data ◽  
Hybrid Stress

Photoelastic behaviour and interionic potentials in alkali halide crystals

1981 ◽  
Vol 59 (10) ◽  
pp. 1359-1366 ◽  
Author(s):  
Jai Shanker ◽  
T. S. Verma ◽  
A. Cox ◽  
M. J. L. Sangster
Keyword(s):  
Shell Model ◽  
High Frequency ◽  
Alkali Halide ◽  
Dielectric Constants ◽  
Critical Test ◽  
Photoelastic Data ◽  
Comparison Of The Results ◽  
Alkali Halide Crystals ◽  
Derivatives Of ◽  
Photoelastic Behaviour

In order to make a critical test of some recently developed interionic potentials based on the shell model, the photoelastic behaviour of the alkali halide crystals has been investigated. Values of the strain derivatives of the static and high-frequency dielectric constants have been calculated from sets of potentials due to Catlow et al., Sangster et al., and Sangster and Atwood. A comparison of the results obtained with available experimental photoelastic data demonstrates the superiority of the second set of potentials of Catlow et al.

Complete experimental solution of three-dimensional elastic problems

1975 ◽  
Vol 10 (1) ◽  
pp. 42-52 ◽  
Author(s):  
A J Durelli
Keyword(s):  
Optical Properties ◽  
Critical Temperature ◽  
Poisson’S Ratio ◽  
Three Dimensional ◽  
Poisson's Ratio ◽  
Strain Measurements ◽  
Complete Determination ◽  
Photoelastic Data ◽  
Moire Method

The mechanical and optical properties of a transparent epoxy are described, the response of which can be ‘locked-in’ at a critical temperature. The Poisson's ratio of this material is about 0.4, which is closer to the Poisson's ratio of common engineering materials than is that of the commonly used epoxies. Since the material is compressible, strain measurements on relaxed slices permit the complete determination of the stress field. Examples of applications to a solid and hollow sphere and to a tube, subjected to diametral compression, are given. The method permits the solution of three-dimensional problems by use of (1) photoelastic data only, (2) the moiré method only, or (3) mechanically obtained data only, or different combinations of them.

Experimental Investigation Into Plugging of Open Ended Piles

2009 ◽  
Author(s):  
Jelke Dijkstra ◽  
Wout Broere
Keyword(s):  
Stress Ratio ◽  
Local Stress ◽  
Absolute Magnitude ◽  
Horizontal Stress ◽  
Pile Head ◽  
Phase Stepping ◽  
Index Matching ◽  
Model Pile ◽  
Refractive Index Matching ◽  
Photoelastic Data

This paper presents the results of a model pile test in a transparent photoelastic medium. This medium is composed of crushed glass particles in a refractive index matching liquid. The test setup allows for quantitative photoelastic measurements. For the measurement of the photoelastic data the phase stepping technique is used. Stresses in the granular medium located next to and in the plug were recorded at varying installation depths of the pile during monotonic jacking of the transparent pile in combination with the pile head load. The horizontal stress ratio in the plug for this particular test is found to be equal to the vertical stress. A distinct stress arch below the pile base is observed during penetration. The high local stress increase in and below the plug move with the pile as the plug travels downward into the soil and do not change much in absolute magnitude.

Superposition of photoelastic data

1977 ◽  
Vol 17 (1) ◽  
pp. 33-36 ◽  
Author(s):  
Guenter Friedrich
Keyword(s):  
Photoelastic Data

Photoelastic investigation of stress intensifications in the interacting nozzle attachment region of pressure vessels

1995 ◽  
Vol 30 (3) ◽  
pp. 167-174
Author(s):  
K B Mulchandani ◽  
D P Shukla
Keyword(s):  
Pressure Vessel ◽  
Pressure Vessels ◽  
New Method ◽  
Pressure Loading ◽  
Isochromatic Fringe ◽  
Photoelastic Investigation ◽  
Opening Mode ◽  
Attachment Region ◽  
Photoelastic Data ◽  
Radial Nozzle

In this paper, the problem of determining the opening mode (mode I) stress intensity factor (SIF) from the photoelastic isochromatic fringe pattern associated with a surface crack located in the ligament region between two radial nozzle-cylinder junctions of pressure vessel has been investigated. The objective is to determine the influence of geometry, size and location of the surface flaw with respect to the radial nozzles. Starting from the crack tip stress field formulation of Etheridge and Dally using three parameters (1)† a new method suited to the analysis of photoelastic data obtained from a single isochromatic fringe loop to extract the SIF has been introduced. This new method has been used to predict SIFs for a range of pressure vessel nozzle spacings when photoelastic models are subjected to internal pressure loading.

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