Investigation of the Mesostructure of a Mechanically Deformed HDPE by Synchrotron Microtomography

Blaise, A.; Baravian, Christophe; Silva, André; Dillet, Jérôme; Michot, Laurent J.; Mokso, Rajmund

doi:10.1021/ma101033b

Cited by 28 publications

(48 citation statements)

References 31 publications

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“…28,29 The increment of I 3 for HDPE after deformation in Fig. 3(b), thus, suggests that the extensive deformation destructs the crystallites, and produces the amorphous region or an intermediate domain between the crystalline region and the amorphous region 25,26,30 for the o-Ps localization. Figure 4 shows the plots of I 3 versus s 3 of nonelongated and elongated LDPE and HDPE.…”

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confidence: 91%

“…In stage II, it gradually whitens by deformation and the transparency decreased in stage III. It is well known that this whitening results from light scattering from a few tens nm size voids, which can be observed by small angle x-ray scattering 25,26 or electron microscopy. 31,32 These voids must be produced in our deformed films by cavitation, but we did not observe a long lifetime component due to o-Ps annihilating in large voids.…”

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confidence: 99%

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Free volume change of elongated polyethylene films studied using a positron probe microanalyzer

Oka

Oshima

Suzuki

et al. 2012

Applied Physics Letters

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Free volume change of low density polyethylene (LDPE) and high density polyethylene (HDPE) films upon mechanical deformation was microscopically investigated by positron probe microanalysis (PPMA). The ortho-positronium (o-Ps) lifetimes were gradually shortened by uniaxial deformation, indicative of shrinkage of the free volume. The o-Ps intensity for HDPE increased by deformation, whereas that for LDPE varied little. It suggests that destruction of crystallites plays an important role in the deformation of HDPE. PPMA is demonstrated to be a promising, powerful probe investigating free volume changes, at different local points subjected to different degrees of deformation, in elongated polymers.

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confidence: 91%

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confidence: 99%

Free volume change of elongated polyethylene films studied using a positron probe microanalyzer

Oka

Oshima

Suzuki

et al. 2012

Applied Physics Letters

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“…Blaise et al who performed postmortem SRμCT examinations coupled with 2D FFT analyses on a predeformed high‐density polyethylene (HDPE), suggesting that the commonly admitted crazing mechanism could not account for the whitening of such “non‐cavitating” materials upon necking, but could result from the crystalline transformation. Soon after, a comparable technique at the same spatial range called incoherent polarized steady‐light transport (IPSLT) was used by those authors and confirmed their SRμCT results .…”

Section: Introductionmentioning

confidence: 99%

3D Damage Micromechanisms in Polyamide 6 Ahead of a Severe Notch Studied byIn SituSynchrotron Laminography

Cheng

Laiarinandrasana

Helfen

et al. 2016

Macromol. Chem. Phys.

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Micro‐damage mechanisms in a semicrystalline polyamide 6 polymer are characterized by in situ synchrotron radiation computed laminography (SRCL) using compact‐tension like specimens with a notch root radius of 0.25 mm. SRCL allows the quantification of cavity nucleation, growth, and coalescence in flat 2 mm thick notched specimens with a micrometer resolution in 3D (under conditions of severe stress triaxiality) during the in situ loading. The maximum damage occurred at mid‐thickness and was located at a small distance ≈ 200 µm from the notch root. It is shown that damage is distributed in distinct zones, which can be linked to different stress triaxiality states. Penny‐shaped cracks are found after some loadings and their diameters are a function of the distance to the notch root. In a layer of about 33 µm no damage was found. In the adjacent 128 µm layer, penny‐shaped cracks are found with diameters of the order of average spherulite sizes (4–6 µm). In the next region, 30–45 µm long cracks are found corresponding to several average spherulite diameters. During propagation, tunnel‐like cracks are formed ahead of the main crack. Finally, crack initiation location is found to be largely dependent on the roughness of the machined notch surface by comparing two samples with the same loading conditions.

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“…However, the in situ determination of the initiation of micro-structural plastic events such as shearing of crystallites or cavitation remains problematic and requires complex devices such as SAXS or tomography [9][10][11][12][13][14][15]. As an in situ and convenient technique, acoustic emission (AE) is often used to analyze plastic deformation and damage of materials such as metals, ceramics and composites [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission from the initiation of plastic deformation of Polyethylenes during tensile tests

Casiez

Deschanel

Monnier

et al. 2014

Polymer

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The acoustic emission (AE) technique has been used in the aim to detect and to observe the initiation of plasticity and damage of several Polyethylenes (PE) during tensile tests. The detection of acoustic signals originating from the deformation of the material is challenging since PE samples strongly attenuate ultrasonic waves. A weak acoustic activity has been recorded during the tests. The use of two types of PE specimens and two methodologies based on the elimination and the discrimination of spurious sources has shown that most of the AE signals truly originate from the plastic deformation of materials. We also observed that the acoustic activity increases with strain rate. Besides, some AE signals are located along the specimen length during tensile tests at high strain rate. The acoustic activity increases strongly with the crystallinity. Microcavities, formed before the yield point of PE samples with high crystallinity in particular, likely initiate the release of acoustic energy. In addition, some signals are collected on PE samples, which do not exhibit a formation of cavitation. Hence, the shearing of crystallites and/or the fragmentation of crystalline lamellae may also be a source of the release of acoustic energies.

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Investigation of the Mesostructure of a Mechanically Deformed HDPE by Synchrotron Microtomography

Cited by 28 publications

References 31 publications

Free volume change of elongated polyethylene films studied using a positron probe microanalyzer

Free volume change of elongated polyethylene films studied using a positron probe microanalyzer

3D Damage Micromechanisms in Polyamide 6 Ahead of a Severe Notch Studied byIn SituSynchrotron Laminography

Acoustic emission from the initiation of plastic deformation of Polyethylenes during tensile tests

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