Effects of Vibration Modes on the Viscoelastic Loss Factor Measured by the Half-Power Method.

Adachi, Eiji; Satoh, Jun‐ichi

doi:10.1299/jsmec1988.35.343

Cited by 1 publication

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“…Therefore, an unconstrained composite beam was fabricated by attaching a composite elastomer to a steel beam (Figure a), and the loss factor obtained from the frequency response function when the center of this specimen was vibrated was compared . The loss factor was obtained from eq using the peak position f of the antiresonance point of the frequency response function and the half-width Δ f at the position 3 dB down from the peak maximum value (Figure b). , The measurements were taken at −20, −10, 0, 10, 20, 30, and 40 °C, and the antiresonance peaks from the second to the seventh order were used for analysis (Figure S10, SI). The loss factors of the composite beams obtained at each temperature were converted to a nomogram based on the time–temperature superposition principle (Figure c).…”

Section: Results and Discussionmentioning

confidence: 99%

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Silica Nanoparticle Reinforced Composites as Transparent Elastomeric Damping Materials

Asai

Seki

Hoshino

et al. 2021

ACS Appl. Nano Mater.

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Inspired by the structure of the cornea, which is the transparent front part of the eye, we developed a transparent and tough silica composite elastomer consisting of poly[di(ethylene glycol)methyl ether methacrylate] (PMEO 2 MA) and 110 nm spherical silica particles without using an organic cross-linking agent. While filler composite elastomers, such as reinforced rubbers, have complex compositions containing multiple additives (dispersants, plasticizers, vulcanizing agents, etc.), the composition of our composite elastomer is very simple. With an increased amount of silica particles, the fracture energy of the composite elastomer (20.2 MJ m −3 ) was improved by 25 times compared to that of unfilled PMEO 2 MA (0.8 MJ m −3 ). Nanoscale mapping using atomic force microscopy elucidated the presence of an interface layer (IL) of approximately 15 nm thickness with a high elastic modulus near the silica particles in the composite elastomer. The fracture energy of the composite elastomer was found to be a maximum when the particle surface distance was approximately 30 nm. This particle surface distance meant that the ILs were just in contact with each other. The surface charge density and Hansen solubility parameter of the silica particles indicated the ionization of silanol groups and interactions caused by hydrogen bonding between polymer chains and the silica surface. The array of silica particles embedded with intervals of a few nanometers was expected to be able to effectively dissipate deformation energy as heat due to shear strain and friction between the particle surface and polymer matrices. Measurements of the vibration-damping properties revealed that the loss factor of the composite elastomer was significantly higher than that of the unfilled elastomer, indicating that the composite elastomer in this study could be applied as an interlayer film for laminated glass in automotive and architectural applications.

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Section: Results and Discussionmentioning

confidence: 99%

“…50 The loss factor was obtained from eq 9 using the peak position f of the antiresonance point of the frequency response function and the half-width Δf at the position 3 dB down from the peak maximum value (Figure 8b). 51,52 f f η = Δ…”

Section: Resultsmentioning

confidence: 99%