An Acousto-Ultrasonic Method for Evaluating Wood Products

Patton‐Mallory, Marcia; Anderson, Kent D.

doi:10.1007/978-1-4757-1965-9_23

Cited by 3 publications

(2 citation statements)

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“…AE techniques have proven to be very powerful for the detection and assessment of damage processes in materials under different loading conditions. For example, AE techniques have been used to study steels (11,12) , to characterise crack nucleation and growth in rocks (13)(14)(15)(16)(17) , to evaluate concrete (18)(19)(20)(21)(22) , to characterise wood products (23)(24)(25)(26) and to study cavitation in hydroturbines (27) .…”

Section: Acoustic Emission Testing Of Bituminous Mixturesmentioning

confidence: 99%

Assessment of low-temperature embrittlement of asphalt binders using an acoustic emission approach

Apeagyei¹,

Buttlar²,

Reis³

2009

Insight - Non-Destructive Testing and Condition Monitoring

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Thin films of paving grade asphalt binders moulded on granite substrates were stressed under rapid cooling and thermal restraint conditions at temperatures ranging from 15°C to-50°C. This temperature range encompasses typical pavement temperatures in colder climates. Differential thermal contraction between the granite substrates and asphalt binders induces progressively higher thermal stress levels in the binders as the temperature drops resulting in thermal crack formation, and the corresponding release of elastic energy in the form of transient stress waves. Using piezoelectric sensors (Digital Wave, Model B-1025), a fourchannel acoustic emission (AE) system was used to record the acoustic emission activity during the binder/granite cooling process. It was observed that AE events of high energy clustered around a narrow temperature range. Assuming the cracking temperature (T cr) to be the temperature at which the AE signal energy exceeds a pre-selected threshold energy level, this AE testing approach was found to be sensitive and repeatable for predicting cracking temperatures (T cr) in four paving grade asphalt binders processed to two distinct ageing levels. The effect of binder type, ageing level and binder film thickness on cracking temperature is discussed. These AE-based T cr predictions showed strong correlations with predictions based on either the AASHTO TP1 or the MP1A protocols.

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Section: Acoustic Emission Testing Of Bituminous Mixturesmentioning

confidence: 99%

Assessment of low-temperature embrittlement of asphalt binders using an acoustic emission approach

Apeagyei¹,

Buttlar²,

Reis³

2009

Insight - Non-Destructive Testing and Condition Monitoring

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“…A nondestructive technique such as ultrasonic measurement and testing has heen found to he more accurate than the conventional practice of visual inspection for assessing the condition of wooden memhers. Ultrasonic measurements have shown considerahle promise in determining the stiffness and strength of wood memhers hy identifying the presence of defects such as knots and decay [1,2,3]. Experimental results have shown significant differences hetween the velocities of ultrasonic signals in defect-free areas and areas with knots, decays, and other localized defects [4].…”

Section: Introductionmentioning

confidence: 99%

Development and Field-Testing of a Hand-Held Ultrasonic Monitoring Device

Klinkhachorn

Nomani

Petro

et al. 1997

Review of Progress in Quantitative Nondestructive Evaluation

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Theoretical Basis of the Acousto-Ultrasonic Method

Kiernan¹,

Duke²

1991

Acoustic Emission: Current Practice and Future Directions

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This paper provides a physical interpretation and theoretical basis for acousto-ultrasonic (AU) results, using through-thickness-transverse-resonance (TTTR), Lamb wave theory, and elasticity. Major emphasis is given to building a model of the AU method. The paper begins with a brief introduction to the AU method and experimental results, physical interpretations, associated theory, and comparisons between theory and AU results. Finally, conclusions are presented identifying the modes of wave propagation influencing the AU measurements.

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An Acousto-Ultrasonic Method for Evaluating Wood Products

Cited by 3 publications

References 0 publications

Assessment of low-temperature embrittlement of asphalt binders using an acoustic emission approach

Assessment of low-temperature embrittlement of asphalt binders using an acoustic emission approach

Development and Field-Testing of a Hand-Held Ultrasonic Monitoring Device

Theoretical Basis of the Acousto-Ultrasonic Method

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