木材科学与技术2025，Vol.39Issue(4)：40-49,10.DOI:10.12326/j.2096-9694.2025062
压缩率对杉木心材回复率及力学性质的影响
Effect of Compression Ratio on the Recovery Rate and Mechanical Properties of Chinese Fir Heartwood
摘要
Abstract
With a target compression ratio of 40%～65%,the compression deformation in the heartwood of Chinese fir was stabilized through heat treatment using a steam-air mixed medium with pressure.The effect of the compression ratio on wood density distribution,set recovery,and mechanical properties were studied.The results showed that both early wood and late wood were compressed at compression ratio of 40%.As the compression ratio increased,the wood's density also increased,while the internal density distribution became more consistent.With the heat treatment of steam-air at medium pressure,the hygroscopic/water absorption set recovery of Chinese fir at different compression ratios were reduced to 0%～0.63%.Under conditions including air-dried,high-humidity,and water absorption,there was almost no recovery occurred.With the increased compression ratio and density,the wood's hardness,bending strength(MOR,MOE),and compression strength perpendicular to grain continuously increased.There was a highly significant quadratic functional relationship between wood density and hardness.Meanwhile,there were extremely significant linear relationship between wood density and MOR,MOE,as well as compression strength perpendicular to grain,with the correlation coefficient being greater than 0.938.During radial loading under compression perpendicular to grain,typical stress-strain characteristics were not observed.At a compression ratio of 40%,the compressive strength perpendicular to grain under tangential loading increased by approximately 50%,however there was almost no increase under radial loading.When the compression ratio reached at least 45%,the compressive strength perpendicular to grain under both tangential and radial loading were almost the same.At a compression ratio of 65%,the compressive strength perpendicular to grain under both tangential and radial loading reached four times more than those of the control wood.关键词
杉木心材/压缩率/回复率/密度/横纹抗压强度Key words
Chinese fir heartwood/compression ratio/set recovery/density/compressive strength perpendicular to grain分类
农业科技引用本文复制引用
赵丽媛,黄荣凤,王艳伟,何啸宇,孙龙祥,付跃进..压缩率对杉木心材回复率及力学性质的影响[J].木材科学与技术,2025,39(4):40-49,10.基金项目
国家自然科学基金项目"基于过热蒸汽压力和介质组成的木材塑性变形永久固定机理及其适用性"(32071690) （32071690）
湖州市重点研发计划项目"劣质材增强及表面高质修饰地板关键技术研发"(2022ZD2049). （2022ZD2049）
