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Photoelasticity

About: Photoelasticity is a research topic. Over the lifetime, 2698 publications have been published within this topic receiving 27957 citations.


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Journal ArticleDOI
TL;DR: In this paper, it is proved that the immersion analogy can be used to analyze these stresses in composite bodies provided all the materials of such bodies have the same weight per unit volume.
Abstract: This paper is a contribution to the experimental stress analysis of composite structures subjected to gravitational forces. It is proved, generally, that the immersion analogy can be used to analyze these stresses in composite bodies provided all the materials of such bodies have the same weight per unit volume. Applications are described in two-dimensional problems immersing urethane-rubber models bonded to epoxy shells in a thallium-formate solution. Photoelasticity is used to determine stresses. The method increases the response obtained and will have application in the solution of problems where constant-acceleration stresses are important, as in dams and solid-propellant rocket grains.
Proceedings ArticleDOI
01 Jan 1987
TL;DR: In this article, the superposition and attenuation of stress waves between boreholes were investigated using a multiple spark dynamic photoelastic apparatus (Mode WZDD-1) and the super-dynamic measuring system.
Abstract: The blasting strain fields between the adjacent boreholes initiated simultaneously were investigated with the dynamic moire-photoelasticity and the strain gages. A multiple spark dynamic photoelastic apparatus (Mode WZDD-1) and the super-dynamic. measuring system were utilized in the dynamic recording. According to the dynamic moire-photoelastic fringe patterns, the superposition of blasting stress waves was analysed, and the distribution of az(in the direction of the line linking two adjacent borehole centers, which is simply called linking-center line in the following) and ar (in the direction which is normal to the linking-center line) in the linking-center line and ea. in the line which is vertical to the linking-center line through the middel point of the linking-center line were calculated quantitatively. The oscillations of strain vs. time in the linking-center line due to the superposition of blasting stress waves were recorded with the foil strain gages. The laws of superposition and attenuation of stress waves between boreholes derived from the measured and calculated results are in agreement with the results from the theoretical analyses.
Proceedings ArticleDOI
06 May 2011
TL;DR: A digital photoelastic image processing method is used, using phase shift technique, re-derivation and demonstration of the phase difference formula to reduce the calculation error.
Abstract: In the traditional photoelastic experiment, We have to get isochromatic and isoclinic stripes, to be a very tedious work. Most of the work requires manual operation to complete, low efficiency, low precision, thus limiting the accuracy of results. This article uses a digital photoelastic image processing method, using phase shift technique, re-derivation and demonstration of the phase difference formula to reduce the calculation error. Digital Photoelasticity technology measurement accuracy has been improved. To further improve the digital photoelastic technique was useful to explore.
Journal Article
TL;DR: In this paper, a three-step color phase shifting approach for automatic determination of the directional field of stresses based on the results of a digitally photoelasticexperiment is presented.
Abstract: This paper is to present a three-step color phase shifting approach for automaticdetermination of the directional field of stresses based on the results of a digitally photoelasticexperiment. A plane polariscope with a white light source is used for recording the necessarilyphotoelastic fringe patterns. Relevant theories of the irradiance equations based on the use ofthe plane polariscope are derived. The obtained wrapped range of the isoclinic parameter isunwrapped to get the physical range by the unwrapping process. The obtained results in thephysical range are compared to those obtained from the four-step phase shifting technique.The unwrapped results show that the method proposed herein provides reasonable accuracy.
01 Mar 2008
TL;DR: In this article, the adaptation of the Boundary Integral Equation to photoelasticity is investigated as a separation technique that the stress distribution in a square plate which is loaded by concentrated forces on natural edges along symmetry axis is investigated.
Abstract: Principal Stress direction and their difference can be obtained directly by the photoelastic experiments using the isoclonic and isochromatic fringe patterns respectively. To obtain the individual principal stresses or the elements of the stress tensor, additional operation is required. The way for obtaining the elements of the stress tensor is called the separation method. In this study, the adaptation of the Boundary Integral Equation to photoelasticity is investigated as a separation technique that the stress distribution in a square plate which is loaded by concentrated forces on natural edges along symmetry axis is investigated.

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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202326
202286
202140
202065
201941
201852