Modeling the Effect of Void Shapes on the Compressive Behavior of Parallel-Strand Lumber
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 9
Abstract
Small voids of varying shapes and sizes are an inherent part of the physical structure of parallel strand lumber (PSL) due to the material’s manufacturing process. To gauge the sensitivity of the material’s mechanical behavior to these voids, this paper proposes and evaluates finite element models that incorporate PSL voids by simulating them as equivalent ellipsoids. It is assumed that the wood phase is a homogeneous and orthotropic continuum, while the void phase is the only source of uncertainty. Two analyses are presented: (1) linear elastic analyses to gauge the effective modulus of elasticity and the distribution of conventional, principal, and effective stresses considering the effect of volume fraction and void shape; (2) nonlinear analyses under uniaxial and biaxial ductile compressive loading scenarios. Linear elastic analyses showed that representing voids as equivalent ellipsoids does not affect the effective elastic moduli and stress distributions in the models under uniaxial loading. Nonlinear analyses confirmed that the overall nonlinear compressive behavior of the models with equivalent ellipsoids are similar to that of their corresponding models with actual voids.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Aug 4, 2016
Accepted: Feb 13, 2017
Published online: May 16, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 16, 2017
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