Damping behavior of commonly used reinforcement powders – An experimental approach

Dora, Siva Prasad; Shoba, Chintada; Varma, Kalidindi Rahul

doi:10.1016/j.jestch.2015.05.001

Cited by 19 publications

(12 citation statements)

References 14 publications

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“…In the tanδ curve, the peak intensity becomes significantly higher (45%) upon recycling, indicating a significant change in the molecular structure of recycled Bioflex as supported by the molecular weight values. The lower molecular weight makes the segmental motion easier and this, in turn, can increase the viscoelastic properties (damping behavior) in polymers [27].…”

Section: Resultsmentioning

confidence: 99%

Deterioration in the Physico-Mechanical and Thermal Properties of Biopolymers Due to Reprocessing

et al. 2019

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Biopolymers are an emerging class of materials being widely pursued due to their ability to degrade in short periods of time. Understanding and evaluating the recyclability of biopolymers is paramount for their sustainable and efficient use in a cost-effective manner. Recycling has proven to be an important solution, to control environmental and waste management issues. This paper presents the first recycling assessment of Solanyl, Bioflex, polylactic acid (PLA) and PHBV using a melt extrusion process. All biopolymers were subjected to five reprocessing cycles. The thermal and mechanical properties of the biopolymers were investigated by GPC, TGA, DSC, mechanical test, and DMA. The molecular weights of Bioflex and Solanyl showed no susceptible effect of the recycling process, however, a significant reduction was observed in the molecular weight of PLA and PHBV. The inherent thermo-mechanical degradation in PHBV and PLA resulted in 20% and 7% reduction in storage modulus, respectively while minimal reduction was observed in the storage modulus of Bioflex and Solanyl. As expected from the Florry-Fox equation, recycled PLA with a high reduction in molecular weight (78%) experienced 9% reduction in glass transition temperature. Bioflex and Solanyl showed 5% and 2% reduction in molecular weight and experienced only 2% reduction in glass transition temperature. These findings highlight the recyclability potential of Bioflex and Solanyl over PLA and PHBV.

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Section: Resultsmentioning

confidence: 99%

Deterioration in the Physico-Mechanical and Thermal Properties of Biopolymers Due to Reprocessing

et al. 2019

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“…It can also be observed that the storage modulus decreases with an increase in temperature, because Al in composites becomes soft with increasing temperature, which reduced the stiffness of composites. The decrease in the dynamic stiffness of the composites with temperature contributes to the storage modulus, which decreases with increasing of temperature [30], as composites maintained high strength over the temperature range of 40-350 • C. The damping capacities of the SiC and the composites infiltrated by Al alloy with 5, 10, 15, and 20 wt. % Si are presented in Figure 8.…”

Section: Microstructurementioning

confidence: 99%

Damping Capacity and Storage Modulus of SiC Matrix Composites Infiltrated by AlSi Alloy

Fan

Zhao

et al. 2019

Metals

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In this paper, we describe how an aluminum alloy-reinforced silicon carbide ceramic matrix composite (SiCCMC) with excellent damping capacity and storage modulus was fabricated by infiltration. The effects of silicon (Si) on the microstructure and damping capacity of the composite were studied. The interface bonding and damping mechanism involved were also discussed. The results show that composites with high damping capacity can be obtained by infiltrating SiC ceramics with aluminum alloy. The residual Si in the SiC ceramic had little effect on the damping capacity, and it provided the passage of aluminum alloy into the interior of the SiC ceramic. The aluminum atoms penetrate the SiC particles by diffusion. Optimal composite damping capacity was obtained when the Si content in the aluminum alloy was 15 wt. %, because the AlSi/SiC interface friction dissipated most of thermal energy. Ti3SiC2 formed on the surface had little effect on the damping capacity. Additionally, by changing the Si content in the aluminum alloy, the strength and damping capacity of the composites can be controlled.

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“…Srivastava 12 described a number of synthesis methods are used for the preparation of MMCs; these MMCs exhibit remarkable wear resistance, mechanical strength, creep behavior, and damping properties proved to be excellent. The results of Prasad et al 13 showed extensive study on the damping behavior of elemental rice husk ash (RHA), fly ash, silicon carbide, and graphite powder at three different frequencies of 0.1, 1, and 10 Hz over a different range of temperatures; the results show that RHA exhibits low damping value among all the powders and the damping capacity of fly ash was found to be decreased at 0.1 and 1 Hz, but for silicon carbides increase in temperature. Janiwarad et al 14 estimated practically with a variable percentage of alumina and graphite by liquid casting process and tested for the microstructure, mechanical properties, and damping behavior; microstructure indicates good distribution in the matrix, resulting strong bonding of the particles; the composite with 10% graphite and 5% alumina showed highest damping ratio compared to cast alloy and to be good damping material.…”

Section: Introductionmentioning

confidence: 94%

Influence of reinforcement and processing on aluminum matrix composites modified by stir casting route

Rozhbiany

Jalal

2019

Advanced Composites Letters

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In the present study, the individual and combined effect of reinforcement on aluminum (Al; 6063) alloy is discussed. These Al metal matrix composites with individual and multiple reinforcements are finding increased application in aerospace, automobile industry, underwater machines, and transportation application, due to improved mechanical and tribological properties like strong, stiff, wear, and impact resistance. Al 6063 alloy reinforced with different elements such as two types of ceramic mortar ash (MA) and nanofibrillated composite (NFC), industrial waste met coke ash (MCA), and agro waste straw ash with the constant rate of 5 wt% for each reinforced element. The results show a significant effect on the mechanical properties such as tensile strength and hardness. Damping characteristic improved by mixing of MA and NFC together and the results shown that the damping characteristics can be good for MCA reinforcement. Logarithmic decrement slowly increased by adding all types of reinforced metal together. NFC has high resistance to wear loss followed by MA and MCA but for mixing all types of reinforcements together resulted in good improvement in wear loss. Microstructure analysis of Al matrix composites is the small grain size and uniform distribution with good particulate matrix interface bonding.

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Damping behavior of commonly used reinforcement powders – An experimental approach

Cited by 19 publications

References 14 publications

Deterioration in the Physico-Mechanical and Thermal Properties of Biopolymers Due to Reprocessing

Deterioration in the Physico-Mechanical and Thermal Properties of Biopolymers Due to Reprocessing

Damping Capacity and Storage Modulus of SiC Matrix Composites Infiltrated by AlSi Alloy

Influence of reinforcement and processing on aluminum matrix composites modified by stir casting route

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