Comparison of elastic properties of low-density polymeric foams determined by ultrasonic wave propagation and quasi-static mechanical testing

Holt, JM; Blackwell, Sabrina; Zani, Lorenzo; Torres-Sánchez, Carmen

doi:10.1016/j.matlet.2019.127243

Cited by 6 publications

(7 citation statements)

References 7 publications

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“…The density, ultrasonic longitudinal, and shear wave velocities are needed for the determination of these two constants. Therefore, measurement of density, ultrasonic longitudinal, and shear wave velocities of materials is sufficient for ultrasonic characterization of isotropic materials 37,58 . Other elastic coefficients can be calculated depending on these two elasticity constants.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the SEM and XRD images of obtained biocomposites given in Figures (5–7), all samples were predicted to be isotropic materials that have the same physical properties in all directions. It was stated that two elastic constants namely longitudinal modulus (L) and shear modulus (G) can completely define an isotropic material's elastic behavior in ultrasonic method 56–58 . To measure the L and G coefficients of an isotropic material, it is sufficient to measure the density (ρ), longitudinal wave velocity (V L ), and shear wave velocity (V S ) of this material.…”

Section: Methodsmentioning

confidence: 99%

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Preparation and ultrasonic characterization of modified epoxy resin/coconut shell powder biocomposites

Oral

Kocaman

Ahmetli

2021

J of Applied Polymer Sci

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A new bio‐based epoxy resin (BER) is produced by the esterification reaction between sebacic acid (SAc) as bio‐based acid and epichlorohydrin (ECH). The epoxy resin (ER) is modified with the BER. The biocomposites are prepared using untreated coconut shell powder (CSP), modified coconut shell powder (MCSP), and MER. The CSP and MCSP particles are mixed with MER in varied compositions (10–50 wt%) for preparation of the MER/CSP and MER/MCSP biocomposites. The influences of CSP and MCSP bio‐fillers amounts on the physical properties (density, elastic constants, acoustic impedance, ultrasonic micro‐hardness, and attenuation coefficient) of biocomposites are investigated using the ultrasonic pulse‐echo overlap method (PEOM). It was seen that the densities, both ultrasonic longitudinal and shear waves' velocity values of obtained biocomposites were higher than those of the MER. All elastic moduli of the MER/MCSP biocomposites have higher values than of the neat MER and MER/CSP biocomposites.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Preparation and ultrasonic characterization of modified epoxy resin/coconut shell powder biocomposites

Oral

Kocaman

Ahmetli

2021

J of Applied Polymer Sci

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“…Ultrasonic measurements of longitudinal wave velocity V L and shear wave velocity V S provide the longitudinal and shear moduli, respectively. [35] The evaluation of elastic properties by measuring the propagation velocities of ultrasonic waves in a solid requires prior knowledge of these characteristics. The determination of longitudinal and shear wave velocities of an isotropic material is an effective method of characterization.…”

Section: Evaluation Of Elastic Propertiesmentioning

confidence: 99%

Green epoxy resin/date stone flour biocomposites: Effect of filler chemical treatments on elastic properties

et al. 2021

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This work aims to study the effect of chemical treatments of date stone flour (DSF) as a filler on the elastic properties of biocomposites based on green epoxy resin (GER) used as a matrix. The main disadvantages of natural reinforcements in biocomposites are the poor compatibility between the reinforcement and the matrix as well as the relatively high moisture sorption. Different chemical treatments using soda (alkaline), benzoyl chloride, and potassium permanganate were applied to the DSF filler. Then, the filler was incorporated into the matrix at 30 wt % to obtain GER/DSF biocomposites. The elastic properties of the biocomposites, namely, longitudinal modulus, shear modulus, bulk modulus, Young's modulus of elasticity, acoustic impedance, Poisson's ratio, and ultrasonic microhardness, were determined using ultrasonic through-transmission method. In addition, the morphology was studied using microscopy analysis. The results obtained revealed a decrease of the elastic properties of the pretreated-filler biocomposite compared to the pure GER. On the other hand, the chemical treatment of the filler leads to an improvement of the elastic properties of GER/DSF biocomposites. The permanganate treatment is the most suitable for GER/DSF biocomposites. The morphology analysis through optical microscopy and scanning electron microscopy showed that chemical treatments enhance the interfacial adhesion between the DSF filler and the GER matrix.

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“…The propagation properties of elastic waves in a material vary depending on the density and elastic modulus [ 15 , 16 ], and the propagation velocity correlates with the quality and strength of the material [ 17 ]. Therefore, the propagation properties of ultrasonic waves can be used to estimate the internal state of the target material, and this method is attracting attention as an effective method for measuring internal defects in the field of concrete inspection [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Moisture Distribution on Velocity and Waveform of Ultrasonic-Wave Propagation in Mortar

Okazaki

Iwase²,

Nakagawa

et al. 2021

Materials

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Considering that the ultrasonic method is applied for the quality evaluation of concrete, this study experimentally and numerically investigates the effect of inhomogeneity caused by changes in the moisture content of concrete on ultrasonic wave propagation. The experimental results demonstrate that the propagation velocity and amplitude of the ultrasonic wave vary for different moisture content distributions in the specimens. In the analytical study, the characteristics obtained experimentally are reproduced by modeling a system in which the moisture content varies between the surface layer and interior of concrete.

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Comparison of elastic properties of low-density polymeric foams determined by ultrasonic wave propagation and quasi-static mechanical testing

Cited by 6 publications

References 7 publications

Preparation and ultrasonic characterization of modified epoxy resin/coconut shell powder biocomposites

Preparation and ultrasonic characterization of modified epoxy resin/coconut shell powder biocomposites

Green epoxy resin/date stone flour biocomposites: Effect of filler chemical treatments on elastic properties

Effect of Moisture Distribution on Velocity and Waveform of Ultrasonic-Wave Propagation in Mortar

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