PREDICTION OF THE MECHANICAL PROPERTIES OF THERMALLY-MODIFIED RUBBER WOOD ON THE BASIC OF ITS SURFACE CHARACTERISTIC

摘要

The goal of this research was to investigate the effect of thermal treatment on mechanical properties and surface characteristic of rubberwood (Hevea brasiliensis) and find the mathematical model to predict the mechanical properties used by its surface characteristic. Rubberwood specimens were treated by steaming at five different temperature levels of 170, 185, 200, 215, and 230 degrees C for two different durations of 1.5 and 3 h. Based on the results, the values of bending strength, modulus of elasticity, compression strength and impact bending decreased, and the glossiness and chromatic aberration (Delta E) increased with increasing temperature and enlarging duration further. This study revealed that chromaticity parameters b*, Delta E and the gloss of perpendicular to grain (GZT) could evaluate the mechanical properties of thermally-modified wood to achieve the mechanical properties detection without destruction.