Variation of stress wave velocity with MC and temperature

Huang, Kang; Booker, R. E.

doi:10.1007/s00226-001-0129-x

Cited by 38 publications

(23 citation statements)

References 3 publications

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“…During the drying process, the velocity of the stress wave increased with decreasing moisture content, a result consistent with those previously reported (Kang and Booker 2002;Oliveira et al 2005;Gonçalves and da Costa 2008). In the case of part 3 (Fig.…”

Section: Variations In Stress Wave Velocity With Different Measuremensupporting

confidence: 92%

“…When the moisture content is lower than the fiber saturation point, the stress wave velocity rapidly decreases with the moisture content. When the moisture content is higher than the fiber saturation point, the stress wave velocity gradually decreases with moisture content (Kabir et al 1998;Kang and Booker 2002;Oliveira et al 2005). Further, a constant increase in the stress wave velocity with the decreasing moisture content from initial to oven-dry was also observed by Simpson and Wang (2001).…”

Section: Introductionmentioning

confidence: 64%

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Effects of Moisture Content and Fiber Proportion on Stress Wave Velocity in Cathay Poplar (Populus cathayana) Wood

Liu¹,

Gao²,

Chen³

et al. 2014

BioResources

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Changes in longitudinal stress wave velocity measured during the drying process of Cathay poplar (Populus cathayana) wood at different moisture contents were investigated. The test was performed at five different positions from bark to pith on each part. Five bars, cut successively from bark to pith with different fiber proportions, were also tested. The corrected velocity was calculated by dividing the velocity by the fiber proportion to negate any possible effects of wood structure on the velocity. The results showed that the longitudinal stress wave velocity decreased with increasing moisture content. Such trends were more obvious when the moisture content was lower than the fiber saturation point (FSP). The longitudinal stress wave velocity increased with increasing fiber proportion. A linear relationship between the corrected velocity and the moisture content was observed. This linear relationship was similar to the relationship between the relative velocity and the moisture content.

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Section: Variations In Stress Wave Velocity With Different Measuremensupporting

confidence: 92%

Section: Introductionmentioning

confidence: 64%

Effects of Moisture Content and Fiber Proportion on Stress Wave Velocity in Cathay Poplar (Populus cathayana) Wood

Liu¹,

Gao²,

Chen³

et al. 2014

BioResources

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“…It has been found that the temperature of a transducer influences the velocity of an ultrasonic wave transmitted through wood during (Kang and Booker, 2002). A special drying unit was made to eliminate such temperature effect.…”

Section: Elimination Of the Temperature Effectmentioning

confidence: 99%

“…This is an evidence that the transducers used in this experiment are influenced by temperature. Kang and Booker (2002) proposed that the viscosity of the glue adhering a crystal to a metal casing may change with temperature and this may cause a delay in transit time.…”

Section: Effect Of Temperaturementioning

confidence: 99%

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The Characteristics of Ultrasonic Wave Transmitted Through Drying Wood

Huang¹

2011

Journal of the Korean Wood Science and Technology

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The possibility of using the properties of an ultrasonic wave as a means for monitoring the moisture content of a board during drying was investigated. The ultrasonic wave signals are influenced by moisture content and other factors such as temperature, moisture gradient and coupling area. The effect of temperature was examined by measuring the transit times, amplitudes and velocities of ultrasonic waves transmitted through air, a metal bar and a board at various temperatures. The effect of a moisture gradient was studied using a model specimen composing five wood pieces of various moisture contents. The velocity and amplitude of the ultrasonic waves transmitted through air increase with temperature, while those through a metal bar and a board decrease. It was confirmed that the temperature effect is partially attributed to the change of transducer's properties. The effect of a moisture gradient on the velocity of an ultrasonic wave varies with the average moisture content of a board. As the dimension of the end face of a board increases the velocity of an ultrasonic wave increases and low frequency components more dominates than high frequency components. The transit times of ultrasonic waves transmitted through a board during kiln drying reflect the temperature steps in the drying schedule and the transducer temperatures.

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Effect of moisture content on propagation characteristics of acoustic emission signal of Pinus massoniana Lamb

Luo

et al. 2019

Eur. J. Wood Prod.

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Variation of stress wave velocity with MC and temperature

Cited by 38 publications

References 3 publications

Effects of Moisture Content and Fiber Proportion on Stress Wave Velocity in Cathay Poplar (Populus cathayana) Wood

Effects of Moisture Content and Fiber Proportion on Stress Wave Velocity in Cathay Poplar (Populus cathayana) Wood

The Characteristics of Ultrasonic Wave Transmitted Through Drying Wood

Effect of moisture content on propagation characteristics of acoustic emission signal of Pinus massoniana Lamb

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