Acoustic emission analysis of industrial plywood materials exposed to destructive tensile load
Open access
Date
2014-05Type
- Journal Article
Abstract
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 pre-damage 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. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000082267Publication status
publishedExternal links
Journal / series
Wood Science and TechnologyVolume
Pages / Article No.
Publisher
SpringerSubject
Acoustic emission; Digital image correlation; Acoustic emission signal; Acoustic emission event; Solid woodOrganisational unit
08759 - Niemz, Peter (Tit.-Prof.)
Notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.More
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