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

Ritschel, Franziska ; Zhou, Yang ; Brunner, Andreas ; Fillbrandt, Thomas ; Niemz, Peter

In: Wood Science and Technology, 2014, vol. 48, no. 3, p. 611-631

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    Titre
    • Acoustic emission analysis of industrial plywood materials exposed to destructive tensile load
    Auteur
    • Ritschel, Franziska. Institute of Building Materials, Swiss Federal Institute of Technology, Zürich, Schafmattstrasse 6, 8093, Zurich, Switzerland
    • Zhou, Yang. University of Freiburg, Werthmannstraße 6, 79085, Freiburg, Germany
    • Brunner, Andreas. Laboratory for Mechanical Systems Engineering, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600, Dübendorf, Switzerland
    • Fillbrandt, Thomas. University of Freiburg, Werthmannstraße 6, 79085, Freiburg, Germany
    • Niemz, Peter. Institute of Building Materials, Swiss Federal Institute of Technology, Zürich, Schafmattstrasse 6, 8093, Zurich, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Wood Science and Technology, 2014, vol. 48, no. 3, p. 611-631. Springer Berlin Heidelberg
    Autre version électronique
    Classification
    • Technologie, Sciences de l'ingénieur
    Identifiant OAI-PMH
    • oai:doc.rero.ch:325601
    Summary
    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.