论文部分内容阅读
以马尾松素材及热处理材为研究对象,测试其经液氮作用48h取出放置室温24h后的抗弯和抗压性能。结果表明:经低温作用后,素材抗弯弹性模量(MOE)和顺纹抗压强度(CSPG)分别增加了8.06%和6.74%,但低温作用对两种力学性质影响不显著(P=0.067~0.182);热处理材MOE和CSPG基本保持不变;素材与热处理材的延性系数分别增加了26.92%和8.60%。木材分子链上的羟基与水分子的胶结作用可能是导致低温作用后木材力学强度增加的主要原因。
Masson pine material and heat-treated wood were used as the research object to test the bending and compressive properties of the masson pine after 24 hours of storage at room temperature for 24 hours. The results show that the MOE and CSPG increase by 8.06% and 6.74% respectively at low temperature, but the effect of low temperature on the two mechanical properties is insignificant (P = 0.067 ~ 0.182). The MOE and CSPG of the heat-treated woods remained unchanged. The ductility coefficients of wood and heat-treated wood increased by 26.92% and 8.60% respectively. The binding of hydroxyl groups and water molecules on the molecular chains of wood may be the main reason for the increase of mechanical strength of wood after low temperature.