Comparison of Finite Element Models for Particle Boards with Homogenous and Three-Layer Structure

Jaroslav Kljak,Vladimir Jambreković,Nikola Španić

doi:10.5552/drind.2018.1753

Abstract

This paper shows the results of finite element (FE) models of three-layer particle boards. Two particle board FE models were made with differently defined structures. In the first model, the structure of commercial three-layer particle board is defined as single-layer with isotropic (PB-1L) properties, while in the second model, it is defined as three-layer with orthotropic properties (PB-3L). The results of FE models were compared with values obtained by testing the commercial particle board. Dimensions of FE models and applied loads were prepared according to bending strength testing mode defined according to EN 310:1993. Model comparison is based on comparison of sample deflection and von Mises stress in the middle of the sample. The analysis was done only in linear elastic region. The obtained results show that models with homogenous material (PB- 1L) achieved greater agreement with measured results (deviation app. 2 %), while models with three-layer material (PB-3L) displayed deviation of app. 7 %. Lower agreement of results obtained for PB-3L model and measured values of commercial particle board is due to a greater number of approximations (elastic characteristics) involved in the simulation model. Despite the greater deviation, the preparation of a three-layer model would be more acceptable for the analysis of strain distribution across the cross-section of the particle board.

Highlights

This paper shows the results of finite element (FE) models of three-layer particle boards
The results of the deflection for the control particle board and the FE models are shown in Figure 2 and Table 3
Max (Figure 2), it is apparent that the values of both FE models match the values of control particle board with high-accuracy

Summary

Introduction

To make the results of previous researches appropriate for the analysis of other particle boards, it would be necessary to define the ratios between the individual elastic characteristics and to apply them to other types of boards. It is stated that ratios of individual layers contribute to changes of bendability and bending coefficient (Gaff et al, 2015a; Gaff et al, 2015b; Ruman et al, 2017; Svoboda et al, 2017) Such results confirm the importance of particle board analysis as multi-layered material and partially explain the influence that individual layers have on the properties of the entire board. Unlike particle boards, when predicting elasto-plastic behaviour of solid wood, useful data could be obtained regardless whether the tensile, compression or bending load is applied, with 16% deviation between the FE model and experimentally obtained values (Milch et al, 2016).

Methods

Results

Conclusion