Elasto-plastic material model of oak at two moisture content levels

Abstract

The mechanical properties of wood show a very high dependence on the moisture content (MC). A consideration of MC in numerical simulations increases the applicability of such prediction with respect to application and moisture states of the wood material. The goal of this work is to develop an accurate orthotropic elasto-plastic model for oak wood (Quercus robur L.) at two different MC levels applicable for finite element analysis (FEA). To achieve this goal, the following steps were carried out: (a) in-house standard specimens tests in compression, tension, and shear and in all three orthogonal directions, followed by three-point bending, where all specimens were conditioned to a 12 and 25.6% MC, prior to the mechanical test; (b) integration of all obtained material characteristics into the consistent numerical material models; (c) validation of the developed material models by comparing the numerically predicted values with the experimental ones; and (d) iterative calibration of the material models by adjusting the individual material characteristics to minimize error using a reference. Material models were successfully developed with the following mean relative errors: 5.2% for 12% MC and 5.8% for 25.6% MC, respectively. Both numerical material models consistently predicted the oak elasto-plastic response that can be easily integrated into any FEA.

Simulation of Wave in Hypo-Elastic-Plastic Solids Modeled by Eulerian Conservation Laws

“…In order to simulate large deformation and penetration problems of elasto-plastic solids, Yeom [40] numerically solved Eulerian multi-material and multi-phase flow conservation laws using a high resolution computational fluid dynamics technique on Cartesian grids. Without considering large plastic deformation and discontinuity between multiple materials or interface between solid and fluid, the elasto-plastic constitutive model can be combined with finite element analysis to study all kinds of solid mechanics problems [41,42].…”