Anaslysis of physical and mechanical properties of wet heartwood and reference wood of Populus deltoides cl.'Xianglin-90'
To explore the differences in physical and mechanical properties between reference wood and wet heartwood of Populus deltoides cl.'Xianglin-90',the 13-year-old P.deltoides cl.'Xianglin-90'were selected as the research objects.The wood density,shrinkage rate,moisture expansion,bending strength,bending elastic modulus,compressive strength and hardness of wet heartwood and reference wood were measured and compared to analyze the differences in their physical and mechanical properties.The results showed that the density(air-dry,basic density,absolutely dried),shrinkage rate(air-dry,absolutely dried)and moisture expansion(air-dry,absolutely wet)were higher than those of the wet heartwood of P.deltoides cl.'Xianglin-90'.Compared to wet heartwood,the radial,tangential,and volumetric air-dried shrinkage rates of reference wood increased by 1.123％,2.335％,and 3.292％,the radial,tangential,and volumetric moisture expansion increased by 0.916％,3.475％and 4.221％,respectively.The bending strength,bending elastic modulus,longitudinal compressive strength,radial transverse compressive strength and tangential transverse compressive strength of reference wood were reduced by 5.617,1 862.853,8.200,0.496,0.426 MPa,respectively,compared to the wet heartwood.The hardness(end,radial,tangential)of wet heartwood respectively increased by 613.333,702.917 and 692.500 N,and there were significant or extremely significant differences in the bending elastic modulus,compressive strength and hardness.The physical properties such as density,shrinkage and moisture expansion of the wet heartwood of P.deltoides cl.'Xianglin-90'were lower than those of the reference wood,and the mechanical properties such as bending strength,bending elastic modulus,compressive strength and hardness were higher than those of the reference wood,the research results can provide applied guidance for the processing process and actual production of P.deltoides cl.'Xianglin-90'in wood.
Populus deltoides cl.'Xianglin-90'wet heartwoodreference woodphysical and mechanical properties
万方数据
维普
