Damping behavior of synthetic graphite beams

Pardini, Luiz Carlos; Neto, Flamínio Levy; Fereira, Jorge Luiz de Almeida

doi:10.1590/s1516-14392006000200015

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…This device is shown in Figure 3. Further details can be found in literature 14 . Excitations were produced by slightly knocking with a nylon tip hammer at the midpoint of the PSs, repeating this operation in each case.…”

Section: Vibration Damping Testmentioning

confidence: 99%

“…Another material that is known by its good damping capacity is graphite 14 . In a study in which two kinds of synthetic graphite, HLM and ATJ, were subjected to mechanical vibrations the reported values of the average damping factors were 0.724 and 0.331%, respectively 14 .…”

Section: Logarithmic Decrement and Damping Factor Analysismentioning

confidence: 99%

“…In a study in which two kinds of synthetic graphite, HLM and ATJ, were subjected to mechanical vibrations the reported values of the average damping factors were 0.724 and 0.331%, respectively 14 . This indicates the damping capacity of both compositions of graniteepoxy investigated in the present study is superior of those of HLM graphite and cast iron.…”

Section: Logarithmic Decrement and Damping Factor Analysismentioning

confidence: 99%

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Behavior of granite-epoxy composite beams subjected to mechanical vibrations

Piratelli-Filho

Levy-Neto

2010

Mat. Res.

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The capacity to damp mechanical vibrations is one of the most important properties of granite-epoxy composites, even superior to the cast iron one. For this reason, these materials have been adopted for manufacturing of tool machine foundations and precision instruments. This work presents a study concerning the behavior of particulate composite beams, based on granite powder and epoxy, subjected to mechanical vibrations. Composite samples were prepared with different combinations of processing variables, like the weight fraction of epoxy in the mixture and size distributions of granite particles. The damping behavior of the material was investigated adopting the logarithmic decrement method. Samples, in the form of prismatic beams, were excited in the middle point and the output signal was measured in a point located at the extremity. The obtained results showed that composite samples, with weight fractions of about 80% of granite and 20% of epoxy, presented damping properties approximately three times greater than gray cast iron.

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Section: Vibration Damping Testmentioning

confidence: 99%

Section: Logarithmic Decrement and Damping Factor Analysismentioning

confidence: 99%

Section: Logarithmic Decrement and Damping Factor Analysismentioning

confidence: 99%

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Behavior of granite-epoxy composite beams subjected to mechanical vibrations

Piratelli-Filho

Levy-Neto

2010

Mat. Res.

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“…The intercalation and deintercalation of lithium ion happen between the parallel graphene platelets during charge and discharge process. In this case, the distance between two graphene platelets is close to 0.34 nm [13][14][15]. However, the kinetics of intercalation and deintercalation of lithium ion in graphite is too slow for it to be used as an anode material in lithium ion capacitor [7].…”

Section: Introductionmentioning

confidence: 95%

Performance of Novel Randomly Oriented High Graphene Carbon in Lithium Ion Capacitors

Kadam

Gadkaree

2018

International Journal of Electrochemistry

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The structure of carbon material comprising the anode is the key to the performance of a lithium ion capacitor. In addition to determining the capacity, the structure of the carbon material also determines the diffusion rate of the lithium ion into the anode which in turn controls power density which is vital in high rate applications. This paper covers details of systematic investigation of the performance of a structurally novel carbon, called Randomly Oriented High Graphene (ROHG) carbon, and graphite in a high rate application device, that is, lithium ion capacitor. Electrochemical impedance spectroscopy shows that ROHG is less resistive and has faster lithium ion diffusion rates (393.7 × 10−3 S·s(1/2)) compared to graphite (338.1 × 10−3 S·s(1/2)). The impedance spectroscopy data is supported by the cell data showing that the ROHG carbon based device has energy density of 22.8 Wh/l with a power density of 4349.3 W/l, whereas baseline graphite based device has energy density of 5 Wh/l and power density of 4243.3 W/l. This data clearly shows advantage of the randomly oriented graphene platelet structure of ROHG in lithium ion capacitor performance.

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“…The pressures for first penetration were reported as 0.95 ± 0.1 MPa for mercury and 2.3 ± 0.2 MPa for the Al-12 wt pct Si melt. Also, Pardini et al [28] have reported mercury porosimetry data for two kinds of commercial synthetic graphite: (1) extruded graphite with coarse grains, designated HLM, and (2) an isotropic compressed fine-grained graphite, designated ATJ. Porosimetry shows a 12 pct open pore structure for the HLM, with a wide size distribution ranging from 1 or 2 to 250 lm.…”

Section: Melt Decarbonizationmentioning

confidence: 99%

Conceptual Design for Lower-Energy Primary Aluminum

Warner

2008

Metall Mater Trans B

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Operating parameters have been identified such that slag melts typical of other carbothermic aluminum processes are thermodynamically unstable. This facilitates the direct reaction of carbon in carbon-saturated aluminum with alumina under dispersed-contact high-intensity conditions. A conceptual design for one million tonnes per annum (1 Mtpa) aluminum production from Bayer alumina is developed. Freestanding graphite reactors and an ancillary plant encapsulated by inert gas are totally unconstrained within refractory-lined shells. Electrical conductive heating and melt circulation in closed loops, employing a 10 vol pct dispersion of fine carbon particles in aluminum (slurry), transports sensible heat to a single pressurized metalproducing reactor (MPR) to satisfy the endothermicity. In the proposed plant, an MPR at 0.28 MPa (2.8 bar) and 2433 K (2160°C) with a hearth 2-m-wide · 190-m-long leads the melt via a barometric leg back to essentially atmospheric pressure, for further in-line processing. The impeller-stirred assimilation of fine carbon particles is followed by multistage gas-lift pumping to provide a 5.4-m total head, as required by two parallel straight-line melt-conductive heaters 1 m in diameter · 226 m in length. Overall energy-consumption figures 28.7 pct lower than today's more recently installed Hall-Heroult electrolytic plants are predicted, with 51.3 pct less purchased electricity, supplemented with 1.10 times the stoichiometric elemental carbon.

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Damping behavior of synthetic graphite beams

Cited by 7 publications

References 3 publications

Behavior of granite-epoxy composite beams subjected to mechanical vibrations

Behavior of granite-epoxy composite beams subjected to mechanical vibrations

Performance of Novel Randomly Oriented High Graphene Carbon in Lithium Ion Capacitors

Conceptual Design for Lower-Energy Primary Aluminum

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