On line interferometric investigation of the neck propagation phenomena of stretched polypropylene fibre

Hamza, A.A.; Sokkar, T.Z.N.; El‐Bakary, M. A.; Ali, Afaf M.

doi:10.1016/j.optlastec.2009.11.007

Cited by 14 publications

(11 citation statements)

References 19 publications

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“…Figure illustrates the calculated phase map of the captured interference patterns during neck propagation of iPP fiber at different times at draw ratio D = 1.4. It is clear that once the neck becomes stable, it propagates along fiber axis with a fixed profile and constant speed which agreed with the previously published data (Coates & Ward, ; Hamza et al, ). Using the 3D image analysis program (Hamza et al, ), the 3D geometrical profile and 3D profile of the refractive index of iPP sample during the propagation of necking were calculated.…”

Section: Resultssupporting

confidence: 92%

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Characterization of the 3Dimension optical, geometrical, and mechanical profiles of iPP fiber with necking deformation

Ali

Felemban

El‐Bakary

2018

Microscopy Res & Technique

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We present a method for evaluating the 3D refractive indices and 3D true stress and/or 3D true strain profiles of "isotactic polypropylene iPP" fibers during necking deformation. Observing the changes in geometrical shape during the deformation process is necessary to understand the mechanical performance of iPP fibers. 3D geometric shape profile and actual stress and strain profiles were measured for iPP fibers during the propagation of neck deformation. These measurements were performed with the aid of an in-situ opto- mechanical device to dynamically characterize different properties of fibers at different strain rates. A software image analysis program was used to calculate the 3D opto-mechanical properties of iPP fibers. The obtained results show that the used dynamic stretching device can be easily used to monitor the deformation process with high accuracy. The effective stress and strain can be determined from the filaments profile. For illustration microinterferograms are given.

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Section: Resultssupporting

confidence: 92%

“…For characterizing the necking behavior, the 3D refractive index profile was measured along iPP fibers during the cold drawing process (Hamza, Sokkar, El‐Morsy, Raslan, & Ali, ). A new 3D refractive index profile was used to characterize the neck propagation phenomena in PP fibers (Hamza, Sokkar, El‐Bakary, & Ali, ).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the 3Dimension optical, geometrical, and mechanical profiles of iPP fiber with necking deformation

Ali

Felemban

El‐Bakary

2018

Microscopy Res & Technique

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“…Necking formation is controlled by different factors that were discussed by different authors [30]. Mainly stretching speed and final draw ratio are the main parameters controlling the necking formation.…”

Section: Resultsmentioning

confidence: 99%

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

Sokkar

El‐Tonsy

El‐Morsy

et al. 2011

Optics & Laser Technology

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“…It relates the oriented birefringence with the maximum intrinsic birefringence. The molecular orientation of nylon 66 samples under investigation can be calculated using the following equation (Hamza et al ):

F ((), α) = Δ n / Δ n_{\max}

where Δn is oriented birefringence and Δn max = 0.089 is the maximum intrinsic birefringence (Balcerzyk, Kozłowski, Wesołwska, & Lewaszkiewicz, ). Measurement of the fibers birefringence can be considered as an indicator to the molecular orientation.…”

Section: Methodsmentioning

confidence: 99%

“…The birefringence measurement is powerful indicator for the study of different characteristics of semicrystalline polymers. Also it can be used to investigate the physical structure accurately (Hamza, Sokkar, El-Bakary, & Ali, 2010a;El-Dessouky et al, 2010;Hamza, Sokkar, El-Bakary, & Ali, 2002;Hamza, Sokkar, El-Farahaty, & El-Dessouky, 2004;Sokkar, El-Farhaty, El-Bakary, Ali, & Ahmed, 2018;Sokkar, El-Tonsy, El-Bakary, El-Morsy, & Ali, 2009). In particular, the birefringence is mainly used to measure the degree of the molecular alignment in uniaxial oriented fibers that utilized in several structure techniques (Hamza, Sokkar, El-Farahaty, & El-Dessouky, 2005).…”

Section: Introductionmentioning

confidence: 99%

The impact of processing conditions on the structural and optical properties of the as‐spun polyamides fibers

Ali

2019

Microsc Res Tech

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The development of crystallinity and orientation during the melt spinning of polyamides (nylon 66) was investigated. This study reports the question of the orientation and crystallinity determination of nylon 66 by means of differential scanning calorimetry, optical polarized microscope, and X‐ray diffraction techniques during the cold drawing process. The different structural properties such as crystallinity, crystal size, birefringence, and different orientation functions were measured as a function of the draw ratio. From the obtained thermogram, it is clear that the melting temperature of the drawn nylon 66 fibers did not show a significant change due to the cold drawing process. As the draw ratio increase, the crystallinity and crystal size increase. The drawing process improves the chain orientations along the fiber axis of nylon 66 fibers. The orientations of the chain segments enhanced due to the cold drawing process of nylon 66 fibers.

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On line interferometric investigation of the neck propagation phenomena of stretched polypropylene fibre

Cited by 14 publications

References 19 publications

Characterization of the 3Dimension optical, geometrical, and mechanical profiles of iPP fiber with necking deformation

Characterization of the 3Dimension optical, geometrical, and mechanical profiles of iPP fiber with necking deformation

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

The impact of processing conditions on the structural and optical properties of the as‐spun polyamides fibers

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