Theorie und Grundlagen der Verleimung und der Prüfung von Holzwerkstoffen

Dunky, Manfred; Niemz, Peter

doi:10.1007/978-3-642-55938-9_11

Cited by 1 publication

(1 citation statement)

References 49 publications

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“…This is only possible if the suppliers can ensure that the particleboards are free of defects. Now, during the production process of a particleboard after gluing, pressing, and out gassing, air inclusions and imperfectly glued regions in the particleboard can strongly influence the load capacity [5]. Suppliers and/or manufacturers must, therefore, test their wood products non-destructively to meet the high demands of the furniture industry.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Enhancement of the Detectability of Flaws with a Coarse Measuring Grid and Air Coupled Ultrasound for NDT of Panel Materials Using the Re-Radiation Method

Schmelt

Marhenke²,

Hasener³

et al. 2020

Applied Sciences

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Non-destructive ultrasonic testing is utilized widely by industries for quality assurance. For sensitive materials or surfaces, non-contact, non-destructive testing methods are in demand. The air-coupled ultrasound (ACU) is one possible solution. This can be used to investigate large, panel-like objects for delaminations and other flaws. For a high detectability, fine measurement grids are required (typically <λ is used), which results in extremely long data acquisition times that are only practicable for laboratory applications. This paper aimed at reducing the required measurement grid points for obtaining high detectability evaluations. The novel method presented in this paper allows a measurement grid that is much coarser than the resulting grid. The method combines a software refinement of the measured data with the Rayleigh-Sommerfeld diffraction integral for the calculation of the pressure distribution on the object's surface. This result allows the precise prediction of delaminations and flaws in the tested object. The presented method shows a decrease in the total investigation time by up to 98%.

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Section: Introductionmentioning

confidence: 99%