摘要
在１００—１３００ｋｇ／ｍ３的密度变异范围选取１７种阔叶树试树，采用典型的６种木材压缩加工条件（气干·２０℃：饱水·２０℃：饱水·１００℃３种条件与约束条件相组合），进行横纹大变形压缩试验和数字化数据采集，经数据分析处理，建立了定量描述木材横纹压缩大变形全领域应力－应交关系的数学表达式。该式的适用性对本试验范围内的各树种、压缩工艺条件均为有效，计算值与实测值十分吻合。
In this paper, seventeen species of hardwood were chosen in the variation range of 100-1300kg/m3 wood density. The large Transverse compression deformation test and the collection of quantitative data were conducted under six kinds typical conditions of wood compression. (The conditions are the combination of three kinds of conditions which are airdried. 20℃, saturated water. 20℃ and saturated water. 100℃ with the restricting conditions. )On the basis of data analysis, the formulas which express quantitatively the relationship between stress and strain and stain were founded as following:when ε≤εy σ=EεIn the formulas above, E is elastic modulus in transverse direction ; σy is yield stressl εy is yield strain; εd is a measure of the strain when all of the pore space in wood is squeezed out. C is the armature of increasing speed of stress when strain above the yield point; ρ and ρs reefer to density of wood and material density of the cell wall respectively. K is a constant that depend on the factors such as the restricting conditions of compressive test,0≤K≤1.The formulas above is adaptable to the tree species and the compressive conditions under the test conditions in this paper. Moreover, the results of calculation were very concordant with the data of experiment.
出处
《林业科学》
CAS
CSCD
北大核心
1995年第5期436-442,共7页
Scientia Silvae Sinicae
基金
国家自然科学基金
关键词
变形压缩
横纹方向
应力
应变关系图
木材
Large compressive deformation, Transverse direction, Stress-Strain diagram
