Bending strength of thin 3-ply poplar plywood in relation to core veneer joints

Vassiliou, V.

doi:10.1007/s001070050201

Cited by 3 publications

(2 citation statements)

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“…4). The final fracture of the plywood specimens passes through several layers, irrespective of their grain orientation, but it does seem to depend on a number of structural features, such as grain orientation among others, and intrinsic flaws or the grade of adhesive layers (Vassiliou 1996). The degraded glue lines and especially the damaged interfaces of the bonded plies lead to delamination and separation of the adjacent veneers.…”

Section: Resultsmentioning

confidence: 99%

Acoustic emission analysis of industrial plywood materials exposed to destructive tensile load

et al. 2014

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Several plywood materials made from spruce wood and, for comparison, solid spruce wood were investigated focusing on the sub-macroscopic damage evolution during tensile loading of the specimens. The destructive tests were simultaneously monitored by the acoustic emission (AE) method and strain field deformation measurement using digital image correlation (DIC). The bilinear interpretation of exponential defect growth identified the start of significant nonlinear behavior at 70 % of ultimate strength for all plywood materials. However, already the preceding and more stable damage evolution at lower stress levels has indicated a variation in intensity of the source mechanisms evaluated by AE energy of the detected events. Additional information on the formation of strain field concentration, which correlates with discrete accumulation in AE events and increased spreading in the distribution of AE energy, reveals the complexity of predamage due to the variation in cracks' magnitude and timescales involved. The correlation between ultimate tensile strength and damage accumulation below 70 % of ultimate strength is determined, as well as the influence of layered structures on damage size shown by the percentage distribution of AE energy.

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Section: Resultsmentioning

confidence: 99%

Acoustic emission analysis of industrial plywood materials exposed to destructive tensile load

et al. 2014

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“…Recently, the wood of poplars has been widely used in the panel industry. It is also used in the furniture industry because of its light colour (Zhou 1989;Vassiliou 1996;De Boever et al 2007;Alpár and Rácz 2009;Katona 2011).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Moisture Content and Drying Temperature on the Colour of Two Poplars and Robinia Wood

et al. 2013

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The colour change of wood has been the topic of numerous research activities worldwide. This study investigates the colour change of Robinia (Robinia pseudoacacia L.) and two hybrid poplars, namely Pannónia poplar (Populus x euramericana cv. Pannónia) and I-214 poplar (Populus x euramericana cv. I-214). The sapwood and heartwood were investigated separately for each of the poplars. The heartwood of Robinia was also investigated. The timbers were dried in a climate chamber at four different temperatures (20 °C, 40 °C, 60 °C, and 80 °C), as the relative humidity was reduced in 5 steps (95%, 80%, 65%, 40%, and 20%) at each temperature. The colour co-ordinates L*, a*, and b* were measured according to the CIELab system. Differences in terms of colour change between wood species and sapwood versus heartwood are discussed in the paper. The effect of wood moisture content and heat on the colour co-ordinates is provided. The colour of Robinia is more sensitive to heat than poplar.

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