Fiber length, thermal, mechanical, and dynamic mechanical properties of injection-molded glass-fiber/polyamide 6,6: plasticization effect

Injection-molded short-and long-glass fiber/polyamide 6,6 composites were subjected to tensile tests. To measure the effectiveness of the fibers in reinforcing the composites, a computational approach was employed to compute the fibermatrix ISS, orientation factor, reinforcement efficiency, tensile-, and fiber length-related properties. Although the LFCs showed great improvement in fiber characteristics compared to the SFCs, enhancement in tensile properties was small, which is believed to be due to the larger fiber diameter. Kelly-Tyson model provides good approximation for the computation of ISS and tensile-related properties.

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“…18,20 These are shown in Figure 2. Generally, L n and L w decrease with an increase in fiber loading for both SFCs and LFCs.…”

Section: Fiber Volume Fraction (V F ) and Fldmentioning

confidence: 93%

Interfacial shear strength and tensile properties of injection-molded, short- and long-glass fiber-reinforced polyamide 6,6 composites

Hassan

Yahya

Rafiq

et al. 2011

Journal of Reinforced Plastics and Composites

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“…The noticeable differences on the strength and modulus of PA66/ GF30 by variation of RH are assumed to be due to damage and plasticization effect. Indeed, the RH = 0%, 50% and 100% specimens represent the conditions where the composites are respectively in glassy (T g > T room ), glass transition (T g % T room ) and rubbery states (T g < T room ) [26,27]. Strain to failure in RH = 50% and 100% specimens are higher than that in RH = 0% specimen, whereas no significant difference is observed between the strain to failure at RH = 50% and 100% specimens.…”

Section: X-ray Micro-computed Tomography (Lct) Observationsmentioning

confidence: 99%

“…The RH = 0%, 50% and 100% specimens represent approximately conditions where the composites are respectively in glassy, glass transition and rubbery states, according to the RH effect on the glass transition temperature [26,27]. For a confirmation purpose, the results of lCT on the RH = 0% and 50% specimens will be presented.…”

Section: Introductionmentioning

confidence: 99%

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Arif

Meraghni

Chemisky

et al. 2014

Composites Part B: Engineering

127

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. b s t r a c tDamage mechanisms of injection molded polyamide-66/short glass fiber 30 wt% composite (PA66/GF30) were analyzed using in situ SEM mechanical tests on specimens conditioned under three relative humidity contents (RH = 0%, 50% and 100%). The validity of these in situ analyses was confirmed by Xray micro-computed tomography (lCT) observations on tensile loaded specimens. Experimental results demonstrated that relative humidity (RH) conditions influence strongly the damage level and damage mechanisms. Indeed, for specimen with RH = 0%, damage initiation occurs at significantly higher load level than those in RH = 50% and RH = 100% specimens. The higher relative humidity condition also results in higher damage level. Damage chronologies have been proposed as damage initiation in the form of fiber-matrix debonding occurs at fiber ends and more generally at locations where fibers are close to each other due to the generation of local stress concentration (for all studied RH contents), and first fiber breakages occur (RH = 0%). These debonded zones further propagate through fiber-matrix interface (for all studied RH contents), and new fiber breakages develop (RH = 0%). At high relative flexural stress, matrix microcracks appear and grow regardless the RH contents. For RH = 100%, these microcracks are also accompanied by many matrix deformation bands. Subsequently, they lead to the damage accumulation and then to the final failure.

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“…Several researchers have observed the significant changes in the mechanical properties like storage and loss moduli and Tan of polymers reinforced with fibers and particulate fillers [5][6][7][8][9][10]. Jin et al [5] conducted the study on dynamic 2 Advances in Tribology mechanical analysis (DMA) of multiprocessed multiwalled carbon nanotube/polymethylmethacrylate (PMMA) composites to determine storage and loss moduli and Tan .…”

Section: Introductionmentioning

confidence: 99%

“…Jin et al [5] conducted the study on dynamic 2 Advances in Tribology mechanical analysis (DMA) of multiprocessed multiwalled carbon nanotube/polymethylmethacrylate (PMMA) composites to determine storage and loss moduli and Tan . Hassan et al [6] investigated the dynamic mechanical property of injection moulded glass fiber/polyamide 66 (PA66) composite. They determined the Tan of the virgin and filled material under dry and 50% relative humidity (RH) and wet condition.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites

Hemanth

Sekar

Pallathadka

2014

Advances in Tribology

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Various amounts of short fibers (glass and carbon) and particulate fillers like polytetrafluoroethylene (PTFE), silicon carbide (SiC), and alumina (Al 2 O 3 ) were systematically introduced into the thermoplastic copolyester elastomer (TCE) matrix for reinforcement purpose. The mechanical properties such as storage modulus, loss modulus, and Tan by dynamic mechanical analysis (DMA) and three-body abrasive wear performance on a dry sand rubber wheel abrasion tester have been investigated. For abrasive wear study, the experiments were planned according to 27 orthogonal array by considering three factors and three levels. The complex moduli for TCE hybrid composites were pushed to a higher level relative to the TCE filled PTFE composite. At lower temperatures (in the glassy region), the storage modulus increases with increase in wt.% of reinforcement (fiber + fillers) and the value is maximum for the composite with 40 wt.% reinforcement. The loss modulus and damping peaks were also found to be higher by the incorporation of SiC and Al 2 O 3 microfillers. The routine abrasive wear test results indicated that TCE filled PTFE composite exhibited better abrasion resistance. Improvements in the abrasion resistance, however, have not been achieved by short-fiber and particlaute filler reinforcements. From the Taguchi's experimental findings, optimal combination of control factors were obtained for minimum wear volume and also predictive correlations were proposed. Further, the worn surface morphology of the samples was discussed.

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Fiber length, thermal, mechanical, and dynamic mechanical properties of injection-molded glass-fiber/polyamide 6,6: plasticization effect

Cited by 30 publications

References 24 publications

Interfacial shear strength and tensile properties of injection-molded, short- and long-glass fiber-reinforced polyamide 6,6 composites

Interfacial shear strength and tensile properties of injection-molded, short- and long-glass fiber-reinforced polyamide 6,6 composites

In situ damage mechanisms investigation of PA66/GF30 composite: Effect of relative humidity

Dynamic Mechanical Analysis and Three-Body Abrasive Wear Behaviour of Thermoplastic Copolyester Elastomer Composites

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