The preparation and use of a stress-sensitive material in multi-layer photoelastic models

Rankilor, P R; McNICHOLAS, J. B.

doi:10.1016/0148-9062(68)90035-1

Cited by 9 publications

(8 citation statements)

References 4 publications

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“…The main advantage of this technique lies on the simultaneous visualization of the stresses generated in the loaded models, when those stresses can be calculated and photographed. On the other hand, the need for using models closest as possible to reality is a limitation of the method, since those models are built from materials which are different from those you are supposed to emulate 1. An adequate choice of the resin, considering the necessary characteristics of a material being classified as photoelastic, is then the main fact that attests the method is reliable 1,[6][7][8][9][10][11][12][13][14][15][16][17] .…”

Section: Literature Reviewmentioning

confidence: 99%

“…For a photoelastic trial, it is necessary to use, for constructing the models, birefringent materials able to fulfill some minimal requirements. Transparency to the light used in the polariscope is fundamental 17 , while the lost of transparency can occur due to two reasons: (1) decrease in indexes of refraction of the constituent materials and (2) trapped air. In both cases, there is an alteration in the photoelastic medium properties leading to light dispersion, therefore reducing the material transparency [18][19][20] .…”

Section: Literature Reviewmentioning

confidence: 99%

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Relevance of Resin for Photoelasticity

et al. 2019

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The goal of this study is to test photoelastic resins for manufacturing models with teeth and/or implants under chewing load. Four commercial brands have been chosen: Araldite (Ciba Chemicals), Flexible GIV-Rigid GIV (Polipox) and PL2 (Measurements Group). Nine discs were manufactured, four of them from each of the photoelastic resin brands and five from different proportions of mixture between Flexible GIV and Rigid GIV. All the models were subjected to the diametral compression test, and observed in a circular polariscope. The first order fringe has always been adopted as a benchmark to calculate the photoelastic constant. To the load of interest (150 Newtons), Flexible GIV resin showed areas that followed the elastic regime. Residual stresses for the resin PL2 and persistence of bubbles within the model were observed. Rigid GIV Resin generated the first fringe order only at 280 Newtons load. Araldite resin behaved within the elastic regime and there were no areas with excessive concentration of fringes. The models generated from the manual mixing generated non-homogeneous photoelastic images. The Araldite resin showed to be the most suitable material for manufacturing birefringent models with teeth and/or implants under chewing load.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

Relevance of Resin for Photoelasticity

et al. 2019

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“…The preparation of the rubber itself was undertaken basically as described by Rankilor & McNicholas (1968) and curing was allowed for about a month before the experiments were conducted. (The mix was 100 parts polymer : 100 parts catalyst (by weight)).…”

Section: Model Detailsmentioning

confidence: 99%

“…THE RESEARCH work described is based on the use of a soft polyurethane rubber called Solithane 1 which has been described previously by the author in connexion with photoelastic analysis techniques (Rankilor & McNicholas 1968;McNicholas & Rankilor 1969). In this case, however, the author is concerned purely with mechanical deformation of the material, and in this respect this urethane rubber has proved to be an ideal material.…”

Section: Introductionmentioning

confidence: 99%

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An approach to the simulation of mining subsidence phenomena in an elastic, layered model

Rankilor

1970

QJEGH

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The author comments on the background to model-analysis of mining problems, and describes the use of urethane rubber in the construction of a layered model simulating strata over mine workings. The unique properties of this rubber allow models to be constructed with layers of varying moduli, and needing only to be subject to a gravitational loading of lg to be activated. The properties of the material allow models to be used many times, over long periods, and can be used to observe 'dynamic' development of mining and tectonic features. In the dynamic model described, the development of a full subsidence profile was observed and calculations showed it to be realistic with respect to equations developed by the National Coal Board to describe observed subsidence curves.Previous experimental work by other researchers using elastic homogeneous models has yielded model 'angles-of-draw' in the region of 45 ~ . In this paper the author describes angles-of-draw below 35 ~ and also the subsidence development profile of the model in relation to those observed for some European mines. The author concludes by suggesting possible future applications for this type of model work.

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Die spannungsoptische Me�patrone in ihrer Anwendung im gebirgsmechanischen Modellversuch

Schmidt¹

1970

Rock Mechanics

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The preparation and use of a stress-sensitive material in multi-layer photoelastic models

Cited by 9 publications

References 4 publications

Relevance of Resin for Photoelasticity

Relevance of Resin for Photoelasticity

An approach to the simulation of mining subsidence phenomena in an elastic, layered model

Die spannungsoptische Me�patrone in ihrer Anwendung im gebirgsmechanischen Modellversuch

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