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The fracture behavior of birch and spruce in the radial-tangential crack propagation direction at the scale of the growth ring

  • Pekka Tukiainen EMAIL logo and Mark Hughes
Published/Copyright: February 15, 2013
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Abstract

Crack-tip displacement fields have been computed based on digital image correlation for spruce (Picea abies [L.] Karst.) and birch (Betula pendula Roth.) wood, which were submitted to pure mode I loading in the RT-direction under both green and air-dried conditions. Moreover, crack propagation was modeled based on both linear elastic fracture mechanics (LEFM) and nonlinear fracture mechanics, relying on the fictitious crack model (FCM). The measured and modeled load versus the crack-mouth opening displacement (CMOD) curves and displacement fields were compared. In the case of spruce, the load-CMOD curves simulated by the FCM coincide well with the measured ones. On the contrary, measured near crack-tip displacement fields in both green and air-dried spruce are better comparable with the LEFM predictions than with the FCM predictions. In the case of green birch, the simulated FCM curve follows the measured curve quite well, but in air-dried birch the simulated FCM curve has a better fit than the LEFM-curve only before maximum load. In birch, the FCM predicts the displacement fields better than the LEFM. In both species, moisture content has a big effect on the softening behavior. In both spruce and birch, the FCM overestimates the displacements ahead of crack tip, whereas the LEFM model underestimates the displacements.


Corresponding author: Pekka Tukiainen, Department of Forest Products Technology, School of Chemical Technology, Aalto University, P.O. Box 16400, FI-00076 Aalto, Finland, Phone: +358 40 555 4480

This work formed part of “E-Wood”, a project supported by the Multidisciplinary Institute of Digitalisation and Energy (http://mide.tkk.fi). The work was also supported by the Academy of Finland (decision number 1127759).

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Received: 2012-8-24
Accepted: 2013-1-15
Published Online: 2013-02-15
Published in Print: 2013-08-01

©2013 by Walter de Gruyter Berlin Boston

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