Quasi-Static Indentation Behavior  of GFRP With Milled Glass Fiber Filler  Monitored by Acoustic Emission

Lakshminarayanan, B Sai; Arumugam,; Santulli, Carlo; Pavlović, Ana; Fragassa, Cristiano

doi:10.22190/fume181204004s

Cited by 7 publications

(6 citation statements)

References 33 publications

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“…In this method, two types of plies with different fibers are co-cured to achieve a desired performance, and to produce a more cost-effective material [15,16]. Most of the work done to-date on hybrid composites has concerned hybrids under tensile [17,18], bending and compression loadings [19][20][21]. There are also some studies on hybrid composites when subjected to indentation and impact loadings [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Stacking Sequence on the Impact Response of Carbon-Glass/Epoxy Hybrid Composites

Ali¹,

Akrami²,

Fotouhi³

et al. 2020

FU Mech Eng

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This paper investigates low-velocity impact response of Quasi Isotropic (QI) hybrid carbon/glass fiber reinforced polymer composites with alternate stacking sequences. Cross-ply woven carbon and glass fibers were used as reinforcing materials to fabricate sandwiched and interlayer hybrid composites. For comparison, the laminates containing only-carbon and only-glass fibers were also studied. Drop weight test was used to impact the samples. The images captured by a normal camera demonstrated that localized damages (delamination) existed within plies. The hybrid laminates had smaller load drops, smaller maximum deflection, and higher maximum load compared to the single fiber laminates. In addition, carbon outside interlayer hybrid laminate showed the highest maximum load and energy absorption, showing the significant dependence of the impact performance on hybridization and stacking sequence. It was concluded that a hybrid composite would help improve impact performance of laminated composites compared to non-hybrid composites if they are properly designed.

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Section: Introductionmentioning

confidence: 99%

Effect of the Stacking Sequence on the Impact Response of Carbon-Glass/Epoxy Hybrid Composites

Ali¹,

Akrami²,

Fotouhi³

et al. 2020

FU Mech Eng

Self Cite

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“…The maximum force increases linearly to indentation depths. This can be suggested to be due to the prevalence of fiber damage among damage modes 37 . Figure 3B shows at all the indentation levels, the fillers have a greater impact on the amount of energy absorbed because it has more time to dissipate the energy.…”

Section: Resultsmentioning

confidence: 95%

“…The initial damage was caused by the delamination that occurred during quasi‐static indentation, and the subsequent damage was caused by the indentation itself. Gradual matrix cracking and debonding damage, followed by fiber breakage at either the compression or tension side of the samples upon failure, were observed on those that were subjected to a low indentation depth 37 …”

Section: Resultsmentioning

confidence: 99%

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A novel approach to enhance the mechanical behavior of glass epoxy laminates with sustainable recycled milled fillers

Elango,

Santulli,

Vellayaraj

2024

Polymer Composites

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The aerospace, automotive, and energy industries can use fiber‐reinforced composites due to their high specific strength and stiffness. However, unexpected external impacts in work cause internal damage and residual strength loss in composite structures. Another ongoing issue is the sustainable management of composite materials' end‐of‐life. The quasi‐static indentation properties of glass epoxy composites are investigated in this study using different kinds of novel filler materials that are recycled from old composite materials: recycled milled carbon (rmCF), recycled milled Kevlar filler (rmKF), and an innovative hybrid filler (rmBF) composed of recycled milled carbon and Kevlar fillers (rmBF). Surface roughness and hardness studies assessed the quasi‐static indentation (QSI) response of neat glass epoxy and glass epoxy composites loaded with fillers using indentation force, absorbed energy, residual dent depth, and evolution of damage area. Compared to the baseline samples, the rmCF composites performed exceptionally well, showing a 16% increase in peak force, a 59% decrease in damaged area, and a 6.32% and 22.5% reduction in surface roughness, respectively (Ra and Sa). After QSI tests, rmC filler samples had 26.8% higher residual flexural strength than neat glass epoxy composites in a three‐point bending test. Through toughening mechanisms like filler interlocking and bridging, micrographs captured using a scanning electron microscope (SEM) showed that recycled fillers provide a higher level of stiffness, better energy dissipation, less damaged area, and overall improved hardness.Highlights Recycled milled carbon (rmCF) and Kevlar hybrid fillers (rmKF) have been integrated into glass/epoxy composites. The damage tolerance of glass epoxy composites was as a whole significantly improved by the rmCF integration. The Kevlar fillers' inadequate adhesion and interlaminar shear strength were compensated for by the Hybrid fillers (rmBF). Micrographs taken with a scanning electron microscope (SEM) clearly show the fillers' role in the resistance to damage propagation processes.

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“…Structural vibrations represent a rather important aspect in the lifetime of most loadcarrying structures. In certain cases and by adding specific devices onto the structures, vibrations may even be used positively, such as for the purpose of energy harvesting [13,30], or damage detection [18,31]. However, the negative influence of structural vibrations is more frequently addressed as they may easily trigger damages and therewith compromise structural integrity.…”

Section: Introductionmentioning

confidence: 99%

Parametric Investigation of a Rail Damper Design Based on a Lab-Scaled Model

Kuchak

Marinković

Zehn

2020

J. Vib. Eng. Technol.

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Background Track noise is one of the main issues in the development of railway networks. It is well known that rail dampers, as a cost-effective, passive means of vibration reduction, do reduce the noise; still, neither the mechanism behind their action nor the influential parameters are well understood. Purpose The main purpose of this work is to investigate the efficiency and influential parameters of a rail damper design based on a lab-scaled model of the rail-damper system and an accurate FE model. Methods Based on experimental and numerical modal analyses and the Modal Assurance Criteria (MAC) analysis, the FE model updating technique was applied to develop a highly accurate FE model of the rail-damper system for the investigated frequency range. In a further step, the developed FE model is used in a parametric analysis to assess various damper parameters with respect to the efficiency of damping rail vibrations and, therewith, radiated noise. Results The investigation performed based on FE simulations demonstrates how different material and geometric parameters of the damper influence the mobility decay rate of rail vertical vibrations. The investigated parameters are the thickness of still and rubber layers, stiffness and damping loss factor of rubber layers, and pre-force in the bolts that press the layers together. Conclusions It is shown that the FE model updating technique was capable of producing a highly accurate FE model despite the challenging properties of the real structure and that a combination of the lab-scaled model and the FE model represents a cost-effective approach.

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Quasi-Static Indentation Behavior of GFRP With Milled Glass Fiber Filler Monitored by Acoustic Emission

Cited by 7 publications

References 33 publications

Effect of the Stacking Sequence on the Impact Response of Carbon-Glass/Epoxy Hybrid Composites

Effect of the Stacking Sequence on the Impact Response of Carbon-Glass/Epoxy Hybrid Composites

A novel approach to enhance the mechanical behavior of glass epoxy laminates with sustainable recycled milled fillers

Parametric Investigation of a Rail Damper Design Based on a Lab-Scaled Model

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