摘要
以桦木(Betula platyphylla)饱水材和生材为研究对象,分别测试了试样经-20,-70,-100,-160和-196℃低温处理48h,之后取出置于室温24h后的抗弯弹性模量(MOE)和抗弯强度(MOR)。研究结果表明,经低温处理后,试样MOE和MOR与未处理材相比均有所增加,饱水材和生材MOE的最大增加量分别为7.4%和4.6%,MOR的最大增加量分别为7.4%和6.8%,但在任一温度水平上,低温处理对MOE和MOR的增加均不显著,同时,不同低温处理温度之间力学性能无显著差异;经过低温处理后,试样延性系数增加,变形能力提高;与混凝土经低温作用后强度下降相比,木材抗低温性能优于混凝土。
The modulus of elasticity(MOE)and modulus of rupture(MOR)of water-saturated and green wood specimens of birch(Betula platyphylla)wood were examined before and after the low temperature treatments at-20,-70,-100,-160,and-196 ℃for 48 h.The results showed that MOE and MOR increased comparing to the untreated specimens after the low temperature treatment.The largest increases in MOE of water-saturated and green wood specimens were 7.4%and 4.6%,while 7.4%and 6.8%in MOR,respectively.However,the increasing effect of low temperature treatment on MOE and MOR of wood specimens were not significant at any temperature level.At the same time,no significant difference was observed between different temperatures.The ductility ratio increased after the low temperature treatment,which improved the deformation ability of wood specimens.The resistance ability of wood to low temperatures was better than that of the concrete which strength declined after the low temperature effect.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2016年第1期1191-1194,共4页
Journal of Functional Materials
基金
中央级公益性科研院所基本科研业务费专项资金资助项目(CAFINT2013C09)
