Degradation behavior of nanoreinforced epoxy systems under pulse laser

Calhoun, M.; Kumar, Anil; Aglan, H.

doi:10.1002/app.29887

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…The heat-affected zone of carbon fiber composite irradiated by CW laser was study by Pan and Hocheng [4].It was found that the heat-affected zone shape thus being affected by the beam scanning direction relative to the fiber orientation. The Laser ablation behavior of composite was tested and the impact factor of morphology of laser ablation zone is analyzed [5,6]. The shape and appearance of hole penetrated by mono-pulse and multi-pulse Nd:YAG laser was studied by Young et al [7],The failure of composite irradiated by laser was studied from the angle of coupled thermo-mechanical.…”

Section: Introductionmentioning

confidence: 99%

Research on Pre-Loaded Composite Irradiated by Laser Beam

Lian

Chen

Yang³

2011

KEM

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This paper investigates failure behavior tests of T300/AG80 composite laminated specimens under tensile and compressive preload using a load holding device and laser irradiation from an Nd: YAG laser. By changing the magnitudes of the preload and the power densities of the laser, the effects of preload and laser power density on the time-to-failure of the specimens were observed. The response process of specimens was synchronized taken in using high-speed camera in experiment. The experimental results showed that tensile mechanical properties of T300/AG80 composite laminated specimens were obviously superior to ones in compression test. The relational expressions between the time-to-failure of specimens and pre-loads as well as with laser power densities were acquired through fitting experiment data. The time-to-failure reduced with the pre-load increasing, the relationship is approximating linear when the laser power density kept invariable. When the pre-load kept unchanged, the time-to-failure reduced as the laser power density increased. The relationship is approximating exponential. A basis for life prediction of structure mechanically loaded in either tension or compression during the irradiation by laser is provided by fitting expression.

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Section: Introductionmentioning

confidence: 99%

Research on Pre-Loaded Composite Irradiated by Laser Beam

Lian

Chen

Yang³

2011

KEM

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“…The study concentrated on the mechanical properties and fracture surface morphology of nano-reinforced structural epoxy systems after pulse-laser irradiation. The type of nano-reinforcement used appears to have the largest effect on the degradation mechanisms of the tested materials when exposed to laser pulse-laser irradiation [4]. Nanoparticles, either alumina nanofibers (ANF) or MWCNT were incorporated into the resole phenolic resin at a 0.15% loading (by weight).…”

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confidence: 99%

Morphological Analysis of Laser Exposed Phenolic-based Nanocomposites

Young¹,

Aglan²

2013

Microsc Microanal

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Polymers are subjected to heat, radiation, moisture and other conditions that may promote accelerated degradation in a broad range of industrial and scientific applications. Studies on the effect that severe environmental conditions have on polymers are critical to understand how to prevent or impede their degradation. High-energy lasers that effectively simulate fires' heat were employed to study the degradation mechanisms of polymeric systems [1][2][3] and the effect evaluated. The study concentrated on the mechanical properties and fracture surface morphology of nano-reinforced structural epoxy systems after pulse-laser irradiation. The type of nano-reinforcement used appears to have the largest effect on the degradation mechanisms of the tested materials when exposed to laser pulse-laser irradiation [4]. Nanoparticles, either alumina nanofibers (ANF) or MWCNT were incorporated into the resole phenolic resin at a 0.15% loading (by weight). The samples were then exposed to pulsed laser (Nd:YAG) for 90 seconds at the notch tip. Optical micrographs were captured with a Wild Heerbrugg M3Z microscope. After flexural testing, the fracture surfaces were cut from the sample and sputtered coated with Au-Pd alloy. The specimens were examined using a Hitachi S-2150 SEM. These images were then compiled into composite fractographs.Optical micrographs with the top surface morphology of the laser-exposed zones are shown in Figure 1 (projection of the x-y plane). After 90 seconds of laser exposure, the phenolic systems exhibit cracks and charring, characterized by iridescent features (Fig. 1a-1c).Charring observed in the MWCNT/phenolic system is more dominant compared to the neat and ANF/phenolic systems. Individual fracture surfaces (projections of the y-z plane) of the phenolic systems were imaged with a SEM and assembled into a mosaic. Individual images were captured at 80x magnification. Microcracks and granular-like morphological features are observed in all specimen types. The neat phenolic and 0.15 wt% ANF/phenolic systems are characterized by cracks and granular-like structures on the fracture surface. The dominant features of the 0.15 wt% MWCNT/phenolic system are the more intense microcracks, compared to the neat phenolic and 0.15 wt% ANF/phenolic. It is rationalized that the enhanced microcracks result from the highly conductive MWCNTs' ability to dissipate more localized heat in the specimen. The granular-like structures appear to be larger in the 0.15 wt% MWCNT/ phenolic specimen than those present in the neat phenolic and 0.15 wt% ANF/phenolic. The fractographs were used to estimate the laser-affected depth of the specimens. The average damage zone depths for the neat phenolic, 0.15 wt% ANF/phenolic, and 0.15 wt% MWCNT/phenolic specimens are 2.2 mm, 2.1 mm, and 1.4 mm, respectively.Top surface and fracture surface morphologies were performed by optical and SEM on laser exposed phenolic resin systems. The results show that the neat phenolic and 0.15 wt% ANF/phenolic dissipated the laser energy throughout the mat...

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Microscopic Mechanisms of Damage Caused by Degradants

Wypych¹

2012

Atlas of Material Damage

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Degradation behavior of nanoreinforced epoxy systems under pulse laser

Cited by 6 publications

References 24 publications

Research on Pre-Loaded Composite Irradiated by Laser Beam

Research on Pre-Loaded Composite Irradiated by Laser Beam

Morphological Analysis of Laser Exposed Phenolic-based Nanocomposites

Microscopic Mechanisms of Damage Caused by Degradants

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