Multi-mode opto-thermo-mechanical stretching system for determination of 3D refractive index along the axis of stretched and/or heated fibres

Sokkar, T.Z.N.; El‐Tonsy, M. M.; El‐Morsy, M.A.; El-Khateep, S.M.; Raslan, M.I.

doi:10.1016/j.optlastec.2010.12.015

Cited by 8 publications

(7 citation statements)

References 27 publications

(29 reference statements)

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“…The variation of the optical and mechanical properties of IPP samples during the stretching process were investigated in situ using the proposed optical technique and a mechanical stretching device designed by Sokkar et al . (). In order to inspect those variations in depth, a sample of IPP fibre was fixed to the motors of the stretching device.…”

Section: Resultsmentioning

confidence: 97%

A novel simultaneous photoelastic and two‐beam interferometric system: I. Dynamic full‐field evaluation of the elasticity modulus profile of polymeric fibres

Hamza

Sokkar

El‐Farahaty

et al. 2014

Journal of Microscopy

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Summary A novel optical setup for simultaneous capturing of photoelastic and two‐beam interference patterns was designed. The designed optical setup was used to simultaneously record two types of patterns. The first pattern is two‐beam interference pattern, and the second one is photoelastic interference pattern produced by objects under stress. This simultaneous capturing of the two patterns allowed us to calculate the full‐field distribution of the elasticity modulus profile of fibres. A mathematical expression of the profile of the elasticity modulus was derived. This was applied to evaluate the elasticity modulus of anisotropic isotactic polypropylene fibres during stretching processes. The profile of the elasticity modulus was determined for both static and dynamic in situ cases where the propagation of different structural deformations was observed and studied using the designed optical setup. Patterns were given for illustration.

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Section: Resultsmentioning

confidence: 97%

A novel simultaneous photoelastic and two‐beam interferometric system: I. Dynamic full‐field evaluation of the elasticity modulus profile of polymeric fibres

Hamza

Sokkar

El‐Farahaty

et al. 2014

Journal of Microscopy

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“…Two-beam polarizing interference Pluta microscope (in its fringe field and uniform field modes) [24] [25] with the aid of stretching device [26] and CCD camera as shown in Figure 3 was used to carry out the experimental Figure 3. Schematic diagram for the modified automatic stretching device attached to heating unit and Pluta polarizing microscope.…”

Section: Resultsmentioning

confidence: 99%

“…1-monochromatic light, 2-polarizer, 3-slit diaphragm, 4-condenser, 5-heater, 6-fibre, 7-heat sensor, 8-temperature controller, 9-objective lens, 10-analyzer, 11-CCD camera, 12-PC computer. Reference [26].…”

Section: Resultsmentioning

confidence: 99%

“…To study the craze propagation after stretching the fibre (cold drawing), the automatic stretching device [26] attached with the Pluta polarizing microscope [24] [25] has been used as shown in Figure 3. This automatic stretching device which consists of two stepper motors, rotating in reverse directions to produce extension with a fixed sample length.…”

Section: Methodsmentioning

confidence: 99%

“…The samples of PP fibres were stretched with the stretching device [26] to initiate crazes and observed directly in the Pluta polarizing interference microscope in its fringe field mode. In this study, the areal craze density was calculated as a function of optical birefringence.…”

Section: D Birefringence Profile and The Mean Birefringence Of Crazementioning

confidence: 99%

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Online Investigation of Optical Properties and Craze Propagation of Drawn Polypropylene Fiber by Using Interferometric Image Analysis

Sokkar¹,

El‐Farahaty²,

Seisa³

et al. 2014

OPJ

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Pluta polarizing interference microscope was used to follow the crazing that occur on the surface of stretched polypropylene fibres at different drawing conditions. The samples were stretched until crazing initiated, and then craze propagation was monitored as a function of drawing speed and test temperature. The effect of craze dimension on their propagation velocity was taken into account. Three-dimensional birefringence profile for crazed polypropylene fibre has been demonstrated to investigate the birefringence of crazed fibre at different test times for fixed drawing speed value. Also the mean birefringence values of crazed polypropylene fibres were calculated and the results showed that, these values increased with the areal craze density. Video images were used to calculate the craze velocity. Optical micrographs and microinterferograms were presented for demonstrations.

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A novel dynamic opto‐thermo‐mechanical stress testing device 1: Design of the device

Sokkar

El‐Farahaty

El‐Bakary

et al. 2018

Microscopy Res & Technique

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This article presents a dynamic opto-thermo-mechanical stress testing device to characterize fiber properties. The device has multi-modes and consists of many functions. These modes include stretching, bending, rotating, twisting, and heating processes. Every process can be controlled by micro-controller unit via software programs specially designed for this purpose. The micro-controller unit can execute two different processes at the same time. Such as, dynamic stretching process under the effect of thermal treatment, dynamic stretching process and relaxation, bending process under the effect of thermal treatment, and so forth. Software programs with their flow charts are designed for the application of these processes. The advantage of this device is that it can be done statically and dynamically to characterize all types of fibers (polymer and optical). The device is designed to be attached with two-beam polarizing interference microscope to investigate the dynamic opto-thermo-mechanical properties of the tested fiber under the effect of different applied stresses. Isotactic polypropylene, iPP, fiber is used for some applications of this device, as examples, in stretching, rotation, and twisting modes. Interferograms and graphs are given for illustration.

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Multi-mode opto-thermo-mechanical stretching system for determination of 3D refractive index along the axis of stretched and/or heated fibres

Cited by 8 publications

References 27 publications

A novel simultaneous photoelastic and two‐beam interferometric system: I. Dynamic full‐field evaluation of the elasticity modulus profile of polymeric fibres

A novel simultaneous photoelastic and two‐beam interferometric system: I. Dynamic full‐field evaluation of the elasticity modulus profile of polymeric fibres

Online Investigation of Optical Properties and Craze Propagation of Drawn Polypropylene Fiber by Using Interferometric Image Analysis

A novel dynamic opto‐thermo‐mechanical stress testing device 1: Design of the device

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