Machine strength and stiffness prediction with focus on different acoustic measurement methods

Andriy Kovryga, J. O. Chuquin Gamarra, Jan-Willem van de Kuilen

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Strength grading is an important step for the production of homogenous and high-quality solid wood material. In particular, for hardwoods, the use of non-visible characteristics is indispensable. Dynamic MOE (MOEdyn) is an important parameter widely used for grading of softwoods and applicable to hardwoods as well. There are two common ways to measure MOEdyn – ultrasound (US) wave propagation and longitudinal stress wave (LSW) propagation. Both methods are used in practice, however, due to the different measurement techniques behind them, the results differ. Current paper analyses the stiffness and strength prediction accuracy for several temperate European hardwood specimens and stress the differences between the two measurement systems. The performance was analysed with regard to grading techniques, testing modes for the mechanical properties (tension and bending) and wood qualities. For more than 2861 pieces of European ash (Fraxinus excelsior), European beech (Fagus sylvatica), European oak (Quercus spp.) and maple (Acer spp), the MOEdyn was measured using both techniques, and destructive tests (tension and edgewise bending) were applied. The results show that LSW has higher prediction accuracy compared to the US MOEdyn. The prediction accuracy for both methods and tensile application can be increased by calculating MOEdyn with average density. Furthermore, the results support the species independent strength grading of hardwoods. Further research on the effect of different wood qualities and sawing pattern is required.
Original languageEnglish
Title of host publicationISCHP 2019 - 7th International Scientific Conference on Hardwood Processing
EditorsJan-Willem van de Kuilen, Wolfgang Gard
Place of PublicationDelft
PublisherDelft University of Technology
Pages211-219
Number of pages9
Publication statusPublished - 2019
EventISCHP 2019: 7th International Scientific Conference on Hardwood Processing - Delft University of Technology, Delft, Netherlands
Duration: 27 Aug 201930 Aug 2019
https://www.aanmelder.nl/105829

Conference

ConferenceISCHP 2019: 7th International Scientific Conference on Hardwood Processing
Abbreviated titleISCHP 2019
CountryNetherlands
CityDelft
Period27/08/1930/08/19
Internet address

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