Effect of steam-heat treatment on mechanical properties of Chinese fir

Abstract

Heat treatment often brings about some negative effects on mechanical properties of wood. Chinese fir is currently underutilized due to some inherent properties that limit its further applications. Using steam as a heating medium and a shielding gas, the heartwood and sapwood of Chinese fir were treated at a temperature ranging from 170ºC to 230ºC and time from 1 to 5 hours in an airtight chamber. Both the modulus of rupture (MOR) and modulus of elasticity (MOE) were increased for the sapwood specimens under the temperature less than 200ºC for short treatment times. The hardness was increased for both two kinds of specimens under the temperature less than or about 200ºC, compared to the untreated specimens. The temperature has a stronger effect on mechanical properties of wood than the time, and the temperature of 200 ºC is a critical point in modifying mechanical properties of wood.

Prediction of Physical and Mechanical Properties of Heat-Treated Wood Based on the Improved Beluga Whale Optimisation Back Propagation (IBWO-BP) Neural Network

“…Table A1 in Appendix A displays the dataset utilised for validating the model's performance in this study, sourced from a 2008 Chinese PhD thesis published on China Knowledge Network [40]. Additionally, data on Chinese white poplar were published in a journal article [41], while findings from the authors' studies on the dimensional stability and mechanical properties of Chinese fir wood were reported in related articles [42,43]. Consistency between these conclusions and those of other scholars [44,45] provides a basis for assuming the reliability of the experimental data.…”