A study on the development of photoelastic experimental hybrid method for colour isochromatics (I)

Nam, Jong-Ho; Hawong, Jai-Sug; Kwon, Gun; Shin, Dong-Chul; Mose, Bruno R.; Park, Sung-Han

doi:10.1007/s12206-010-0337-0

Cited by 13 publications

(6 citation statements)

References 27 publications

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“…Due to the nature of the geometry of the ring, the extrusion under the compression ratio of 20 % occurred at very low pressures of 0.98 MPa, limiting the application of seals with a square geometry, especially for high‐pressure applications. From earlier research done on O‐ring under the same loading conditions, extrusion was found to occur when the internal pressure was above 3.92 MPa [8]. Therefore the O‐ring may function better under high pressure when compared to the square ring.…”

Section: Experiments Results and Discussionmentioning

confidence: 90%

“…This research employs the photoelastic experimental hybrid method which combines the merits of analytical, experimental and numerical concepts to analyze the stresses in the seal [6,7]. The hybrid technique of stress analysis has been developed by researchers [7][8][9][10]. In addition to analyz-ing the contact stresses in the square ring, the effects of extrusion on the performance and the dependence of the deformation angle on the applied internal pressure are investigated.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the performance of square ring under uniform squeeze rate and internal pressure

Alunda

Agumba

Ondicho

et al. 2020

Materialwissenschaft Werkst

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Transportation and controlling fluid flow under high pressures in pumps, valves, boilers and heat exchangers is a common exercise in the industries. The main challenge, however that has confronted designers and manufacturers of pumps and valves along with those responsible for the maintenance and upkeep of such types of machinery is managing leakages at the positions where the seals are used. One fundamental feature of seal packing is the ability of the seal to ′flow′ into the groove spaces and effectively block fluid from passing through them. The square ring has shown good ‘flow’ behavior in addition to offering low contact stresses. This research seeks to investigate the performance of the square ring. The Hertz contact theory and photoelastic experimental hybrid method are used in the study of the performance of the square ring under a squeeze rate of 20 % and varying internal pressure. It was observed that while increasing the applied internal pressure, the deformation length and angle increased due to the high stresses produced by the applied pressure. Additionally, was initiated at an internal pressure of 0.98 MPa.

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Section: Experiments Results and Discussionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Investigating the performance of square ring under uniform squeeze rate and internal pressure

Alunda

Agumba

Ondicho

et al. 2020

Materialwissenschaft Werkst

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“…For a diametrically compressed compact disk, the methodology of separating the isoclinics is presented by Baek [68]. These drawbacks are removed by the employment of digital photoelasticity [69][70][71].…”

Section: Introductionmentioning

confidence: 99%

Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces

2022

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The stress state from an eccentric ring made of an elastic material symmetrically loaded on the outer boundary by concentrated forces is deduced. The analytical results are obtained using the Airy stress function expressed in bipolar coordinates. The elastic potential corresponding to the same loading but for a compact disk is first written in bipolar coordinates, then expanded in Fourier series, and after that, an auxiliary potential of a convenient form is added to it in order to impose boundary conditions. Since the inner boundary is unloaded, boundary conditions may be applied directly to the total potential. A special focus is on the number of terms from Fourier expansion of the potential in bipolar coordinates corresponding to the compact disk as this number influences the sudden increase if the coefficients from the final form of the total potential. Theoretical results are validated both by using finite element software and experimentally through the photoelastic method, for which a device for sample loading was designed and constructed. Isochromatic fields were considered for the photoelastic method. Six loading cases for two different geometries of the ring were studied. For all the analysed cases, an excellent agreement between the analytical, numerical and experimental results was achieved. Finally, for all the situations considered, the stress concentration effect of the inner hole was analytically determined. It should be mentioned that as the eccentricity of the inner hole decreases, the integrals from the relations of the total elastic potential present a diminishing convergence in the vicinity of the inner boundary.

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“…If colour isochromatic data instead of white and black isochromatic data is used in a hybrid method, the hybrid technique can be widely applied to various fields. However, the photoelastic experimental hybrid method of colour isochromatics has been used only for a stress concentration problem [18]. The present research aims to explore the utility of the photoelastic experimental hybrid method for colour isochromatics of crack problems.…”

Section: Introductionmentioning

confidence: 99%

A study on the development of photoelastic experimental hybrid method for colour isochromatics (II)

et al. 2011

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Using the photoelastic experimental hybrid method, we can obtain stress intensity factors and separate the stress components near the crack tip of any material under various loading conditions from only isochromatics. However, monochromatic light has, until now been used in the photoelastic experimental hybrid method to produce black and white isochromatics. The existing photoelastic experimental hybrid method using black and white isochromatics requires high order fringes to obtain sufficient experimental data for photoelastic hybrid techniques. If a photoelastic experimental hybrid method for colour isochromatics is developed, isochromatics with a maximum fringe order of 2 will be adequate for gathering the necessary experimental data for stress analyses using photoelastic hybrid techniques. Therefore, in this work, photoelastic experimental hybrid method for colour isochromatics of a crack problem was developed, and its superiority demonstrated by comparing its results with the results from black and white isochromatics. The use of few fringe orders in photoelastic experimental hybrid method for colour isochromatics is an important feature of this method. Because of this feature, this method, specifically the reflection type photoelastic method where low fringe orders are produced compared to the transmission type photoelastic method, can be widely used in stress analysis of real components.

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A study on the development of photoelastic experimental hybrid method for colour isochromatics (I)

Abstract: Isochromatics obtained from photoelastic experiment shows the stress distributions of the full field of a structure under load.

Cited by 13 publications

References 27 publications

Investigating the performance of square ring under uniform squeeze rate and internal pressure

Investigating the performance of square ring under uniform squeeze rate and internal pressure

Stress State in an Eccentric Elastic Ring Loaded Symmetrically by Concentrated Forces

A study on the development of photoelastic experimental hybrid method for colour isochromatics (II)

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