Elastic constant determination of hardwoods using ultrasonic insertion technique

Daud, Anis Nazihah Mat; Jaafar, Rosly; Ayop, Shahrul Kadri; Yaacob, Mohd Ikhwan Hadi; Rohani, Supar

doi:10.1016/j.ultras.2016.11.025

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…Meanwhile, the attenuation coefficient of KGM gel varied around (0.1303 ± 0.0107) to (0.1373 ± 0.0103) dB cm -1 as the water temperature increased from (21.5 ± 0.1) to (23.5 ± 0.1) o C. Table 1 also indicated that acoustic properties of KGM gel varied within 7.50 % from its average values. The variation of acoustic properties of KGM gel is probably caused by the sample alignment with the transducers [19,20]. Thus, the sample should be carefully positioned between transmitting and receiving transducers so that its surface is perpendicular to both transducers.…”

Section: Resultsmentioning

confidence: 99%

Acoustic Characterisation of Konjac Glucomannan Gel as a Medical Phantom

Daud

Rohani

Jaafar

2017

SSP

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Acoustic properties are the main criteria to evaluate the compatibility of tested materials as a medical phantom. We determined the acoustic properties of konjac glucomannan (KGM) gel to verify its compatibility as a medical phantom. The acoustic properties measurement employed ultrasonic insertion technique and utilized two identical transducers of 5 MHz center frequencies. One KGM gel block with 5.62 mm thickness was used as sample to determine its longitudinal speed, acoustic impedance and attenuation coefficient at three different water temperatures; (21.5 ± 0.1), (22.5 ± 0.1) and (23.5 ± 0.1) °C. Findings indicated that its longitudinal speed and acoustic impedance increased from (1495 ± 1) to (1499 ± 1) m s-1 and (1.555 ± 0.001) to (1.559 ± 0.001) × 106 kg m-2 s-1 as the water temperature increased from (21.5 ± 0.1) to (23.5 ± 0.1) °C. It also indicated that its attenuation coefficient varied around (0.1303 ± 0.0107) to (0.1373 ± 0.0103) dB cm-1 with increasing water temperature. KGM gel is compatible to be a medical phantom since its acoustic properties are comparable to the acoustic properties of human soft tissue.

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Section: Resultsmentioning

confidence: 99%

Acoustic Characterisation of Konjac Glucomannan Gel as a Medical Phantom

Daud

Rohani

Jaafar

2017

SSP

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“…Over the years, with the development of equipment, several studies have been conducted corroborating the effectiveness and accuracy of ultrasound technology in the characterization and inference of wood properties [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. For the complete characterization of wood with ultrasound, it is possible to use several specimen formats, such as spherical [ 10 , 24 ], prismatic [ 3 , 20 , 25 , 26 , 27 ], polyhedral [ 12 , 20 , 22 ], and multifaceted discs [ 12 , 20 ]. Polyhedral specimens with 26 faces were initially proposed by Francóis [ 28 ] and polyhedral specimens with 18 faces were proposed by Arts [ 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Reducing the Size and Number of Faces of Polyhedral Specimen on Wood Characterization by Ultrasound

2023

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The complete characterization of wood, with the determination of the 12 elastic constants that represent its orthotropy, is greatly relevant in applications employing structural calculation software programs. Ultrasound allows for such characterization with relative simplicity when compared to other methods. The polyhedron is considered the most appropriate specimen format for allowing the 12 constants to be calculated with a single specimen, and the traditionally used one is the 26-sided polyhedron, which, to be produced manually with more precision in directing the main directions of the wood, needs larger faces. The accuracy of this technique tends to be reduced when increasing the growth rings’ inclination since the waves deviate from the main directions of orthotropy. This research aimed to verify whether it is possible to reduce the polyhedra dimension without affecting the results of the elastic parameters obtained in wood characterization by ultrasound. The results indicate that the dimension of the polyhedron can be reduced without prejudice to the results of the elastic parameters obtained by the ultrasound test and that, in the manual production process of the specimen, the best way to make this reduction is to eliminate the faces unused in the test, changing the polyhedron to 18 faces instead of 26. Reducing the number of faces simplifies the manufacturing process and thus increases the possibility of producing specimens with straighter growth rings and better-directed symmetry axes.

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“…Many studies describing the application of the through-transmission method relate to composites used in industry [ 33 ]. Non-destructive tests are also used to test the elastic properties of composite materials [ 34 , 35 ]. The through-transmission method as well as the Phased Array (PA) method make it possible to detect defects inside composite materials [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Detection of Real Defects in Polymer Composites by Ultrasonic Testing and Recurrence Analysis

et al. 2022

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This paper presents results of ultrasonic non-destructive testing of carbon fibre-reinforced plastics (CFRPs) and glass-fibre reinforced plastics (GFRPs). First, ultrasonic C-scan analysis was used to detect real defects inside the composite materials. Next, the composite materials were subjected to drilling in the area of defect formation, and measured forces were used to analyse the drilling process using recurrence methods. Results have confirmed that recurrence methods can be used to detect defects formed inside a composite material during machining.

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Elastic constant determination of hardwoods using ultrasonic insertion technique

Cited by 7 publications

References 7 publications

Acoustic Characterisation of Konjac Glucomannan Gel as a Medical Phantom

Acoustic Characterisation of Konjac Glucomannan Gel as a Medical Phantom

Effect of Reducing the Size and Number of Faces of Polyhedral Specimen on Wood Characterization by Ultrasound

Non-Destructive Detection of Real Defects in Polymer Composites by Ultrasonic Testing and Recurrence Analysis

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