Thermal effects under elastic and plastic deformation of polyethylene

Guseva, M. A.; Gerasin, V. A.; Garishin, O. K.; Shadrin, V. V.; Plekhov, O.; Pawlak, Andrzej

doi:10.1016/j.polymer.2014.11.041

Cited by 11 publications

(7 citation statements)

References 27 publications

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“…Afterward, more investigations were carried out by Galeski and Pawlak et al . supporting this proposed model that cavities are being formed in the amorphous phase.…”

Section: Deformation Mechanisms Of Semi‐crystalline Polymersmentioning

confidence: 99%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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Cavitation‐induced stress whitening in semi‐crystalline polymers during stretching significantly influences the physical properties of the materials. This review summarizes studies focusing on two different cavitation processes triggered at small and large strain regimes. The corresponding mechanisms of these two cavitation processes are discussed. For cavitation activated at small strain, there are two basic but distinctly different models with the initiation of cavities either in the amorphous phase or in the crystalline skeleton. For the cavitation triggered at a large strain regime, there are also two different arguments being either due to the defects located in the ends of micro‐fibrils or as a consequence of the fragmentation of load‐bearing inter‐fibril/micro‐fibril tie chains in highly oriented amorphous networks. A unified understanding of the cavitation processes during stretching semi‐crystalline polymers based on interpenetrated network model is proposed. Finally, this review outlooks future research topics for better understanding the cavitation mechanism to meet the industrial need.

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“…Afterward, more investigations were carried out by Galeski and Pawlak et al . supporting this proposed model that cavities are being formed in the amorphous phase.…”

Section: Deformation Mechanisms Of Semi‐crystalline Polymersmentioning

confidence: 99%

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Men

2018

Macro Materials & Eng

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“…The reason is not yet clear, and studies of this phenomenon are not known. Anisotropic internal stress imposed by the cold drawing is an explanation that Bartoletta proposed [9,17,18]. Another point is that the DSC curves show no clear difference in the temperature region where cold crystallization should take place.…”

Section: Discussionmentioning

confidence: 96%

“…The dissipation of energy and heating of matter due to plastic deformation is well known and accepted as a pivotal mechanism in the deformation and failure of thermoplastic polymers. Many publications describe self-heating effects for cold drawing and the necking phenomenon [1,2,3,4,5,6,7,8,9,10]. Haward gives a survey of different heating effects in thermoplastics due to deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Haward gives a survey of different heating effects in thermoplastics due to deformation. It is reported the temperature rise and heat generation is at its highest in the first occurrence of the neck [9]. The actual values for the maximum temperature differ for the different publications, as they are highly dependent on the polymer and the method of measurement.…”

Section: Introductionmentioning

confidence: 99%

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Thermomechanical Characterization and Modeling of Cold-Drawing of Poly(ethylene Terephthalate)

2019

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The tensile testing of amorphous polyethylene terephthalate is observed until failure by IR thermography and optical strain measurement. The deformation can be subdivided in six deformation phases: elastic deformation, neck formation with a localized sharp temperature rise, neck propagation, which is also known as cold-drawing, with heat generation in a transition zone, crack initialization with local heating, crack growth, and rupture. These deformation phases are showing different mechanical and thermal reactions to the deformation. The initial and drawn samples are studied with differential scanning calorimetry. Alongside heating due to the dissipation of mechanical energy, latent heat due to strain-induced crystallization was detected. While the material is cold-drawn, a high dependence on the crosshead speed is found for the heat generation as well as the draw ratio, mechanical response, and morphological changes due to orientation and crystallization. For cold-drawing, a thermomechanical model is introduced, which is based on the first law of thermodynamics and reproduces the temperature distribution along the sample.

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“…Our previous experiments showed that under these deformation conditions temperature of stretched polymers and composites does not rise and therefore the deformation process is close to isothermal. 22 True stress-strain curves were not obtained, but nominal stress-strain plots are quite adequate for the present purpose. Structure of pristine and deformed polymers and composites was studied by means of AFM (Dimension Icon microscope), SEM (Jeol JSM-35C apparatus), and X-ray analysis (DRON-3 diffractometer).…”

Section: Methodsmentioning

confidence: 91%

Tensile behavior of polyolefin composites: the effect of matrix parameters

Guseva

Gerasin

Shklyaruk

2016

J of Applied Polymer Sci

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Polyolefin composites were prepared from 14 PE matrices and three different mineral fillers (montmorillonite, palygorskite and glass microspheres) via melt compounding in an extruder. Mechanical properties of the obtained systems were analyzed with emphasis on elongation at break and conditions for ductile/brittle failure were determined. When filler content is raised beyond a certain "critical" value, tensile properties are dramatically altered and transition occurs from ductile behavior to brittle fracture. This transition is displayed by a well-defined "step" on the plot of strain at break versus concentration of particles. The value of "critical filler content" was found to depend mainly on level of crystallinity of a matrix while other parameters (chemical nature of filler particles, their size, shape and surface treatment) are less significant. "Critical filler content" will decrease with growth of crystallinity of a polymer and with highly crystalline HDPEs it is as low as 2-8 vol %. Otherwise, with noncrystallizing and low-crystalline polymers elongation at break decreases gradually with concentration of mineral particles and ductile type deformation is maintained at fairly large filler fractions. The results presented here will be useful for a proper selection of a matrix polymer in composites with mineral fillers.

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Thermal effects under elastic and plastic deformation of polyethylene

Cited by 11 publications

References 27 publications

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Cavitation‐Induced Stress Whitening in Semi‐Crystalline Polymers

Thermomechanical Characterization and Modeling of Cold-Drawing of Poly(ethylene Terephthalate)

Tensile behavior of polyolefin composites: the effect of matrix parameters

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