Stress-strain behavior of high-density polyethylene below the yield point: Effect of unloading rate

Патлажан, С. А.; Hizoum, Kamel; Rémond, Yves

doi:10.1134/s0965545x08050040

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…This is expected since LDPE is softer and has low tensile strength compared to HDPE because it has lower crystallinity content [34], as explained above. Since many papers [34][35][36][37][38][39] are available in the literature studying the stress-strain relationship of different grades of PEs, the stressstrain relationship of HDPE and LDPE are omitted in the following discussion.…”

Section: Stress-strain Propertiesmentioning

confidence: 99%

The Influence of LDPE Content on the Mechanical Properties of HDPE/LDPE Blends

Elhrari¹

2018

RDMS

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Mechanical properties of blend of high density polyethylene (HDPE) and low density polyethylene (LDPE) have been investigated. Four different HDPE/LDPE blends with various ratio (80/20,60/40,40/60, and 20/80) were prepared by melt-mixing technique using mini-twin-extruder at 200 ᵒC and 90rpm. Characterization tests including tensile and impact strength tests as well as hardness have been performed in order to better understand the behavior of these blends. Information on ductility and toughness were obtained from the stress-strain curves of HDPE/LDPE blends. Mechanical properties were varied according to LDPE content. Blends-rich with LDPE showed to have lower strength and hardness and higher elongation, impact strength, ductility and toughness than blends-rich with HDPE. Blend with the composition (HDPE (40)/LDPE (60)) showed comparatively better overall mechanical properties.

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Section: Stress-strain Propertiesmentioning

confidence: 99%

The Influence of LDPE Content on the Mechanical Properties of HDPE/LDPE Blends

Elhrari¹

2018

RDMS

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“…This statement was used in a series of papers devoted to structural mechanics of semicrystalline polymers prior to the yield point [147][148][149][150][151][152]. The central idea of the proposed approach is based on the experimental evidence of stiffness decrease of semicrystalline polymers under small-strain tensile drawing (see ''Quasi-static stress-strain state and elastic moduli'').…”

Section: Structure-sensitive Mechanics Of Semicrystalline Polymersmentioning

confidence: 99%

“…where b = c/kT is the measure of structural transformation intensity under the applied stresses [149,151,152]. The constitutive equations corresponding to the BSME presented in Fig.…”

Section: Structure-sensitive Mechanics Of Semicrystalline Polymersmentioning

confidence: 99%

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Structural mechanics of semicrystalline polymers prior to the yield point: a review

Патлажан

Rémond

2012

J Mater Sci

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The review focuses on the current studies of the deformation response and accompanying structural transformations of thermoplastic semicrystalline polymers subjected to uniaxial tension prior to the yield point. The mechanisms of strain-induced cavitation of amorphous layers and damages of crystalline lamellae are analyzed in line with novel results on the deformation behavior of solid polymers at temperatures exceeding the glass transition point. The coupling of viscoelastic and plastic deformation mechanisms with the small-strain structural transformations is critically discussed on the basis of the advanced theoretical modeling of mechanical properties of semicrystalline polymers.

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“…As a result, it may enable partial recovery of void‐free surfaces during stress unloading and strain recovery. Since void healing may depend on both the elastic reaction of microfibrils inside the cavities and structural evolution of the surrounding polymer matrix, we assume that void recovery may contain elastic and viscoelastic components, as is typically considered for polymer chains . This mechanism implies that the high rate recovery of the voids observed during stress unloading occurs mainly due to elastic forces, and after this initial elastic reaction, void recovery becomes time‐dependent.…”

Section: Resultsmentioning

confidence: 99%

Time-resolved small-angle X-ray scattering study of void fraction evolution in high-density polyethylene during stress unloading and strain recovery

et al. 2015

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By means of time-resolved small-angle X-ray scattering, we developed an analysis methodology to assess the void volume fraction v in high-density polyethylene (HDPE) during tensile testing. The specimens were first drawn up to different imposed strains, and subsequently were subjected to stress unloading and strain recovery stages. During the loading stage, v progressively increased with the strain level, starting from a well-defined onset strain prior to the yield point. In particular, v reached a maximum of 8.75 vol% for a strain of 12.5% in the case of a HDPE grade with a molecular weight of 105 000 g mol −1 . Stress unloading and strain recovery caused a decrease in v attained at the end of the loading stage. For a HDPE grade with a molecular weight of 55 000 g mol −1 , v was more important during the loading stage and the decrease in v was less marked during the stress unloading stage when compared to the HDPE with molecular weight of 105 000 g mol −1 . The residual and reversible components of void volume fraction were revealed.

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Stress-strain behavior of high-density polyethylene below the yield point: Effect of unloading rate

Cited by 10 publications

References 20 publications

The Influence of LDPE Content on the Mechanical Properties of HDPE/LDPE Blends

The Influence of LDPE Content on the Mechanical Properties of HDPE/LDPE Blends

Structural mechanics of semicrystalline polymers prior to the yield point: a review

Time-resolved small-angle X-ray scattering study of void fraction evolution in high-density polyethylene during stress unloading and strain recovery

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