摘要
用参数分离法对手工刨切的厚为0.8、0.5、0.35、0.25、0.15mm的白杨刨片进行了横纹压缩流变试验。结果表明,用上述几种厚度的刨片所分别叠成的厚约10mm的试件,其柔量大于厚度为10mm木块试件的柔量;刨片越薄,柔量越大。弹性变形及瞬间塑性变形的增长,意味着实木经过刨切,因反复受力而使木材高聚物分子及细胞壁组织都受到影响,并有一定程度的破坏。实木经过刨切成为薄片后再层叠起来所组成的试样,在横纹压缩流变性能方面所体现的变化,一定程度上与木块受压所发生的变化,在趋势上是一致的。然而,由于前者试样系由薄刨片层叠而成,因而在影响其流变性能的诸多因素中,尚有刨片厚度及刨片层叠方向二者明显的影响作用。
The rheological behaviours in compression perpendicular to grain of the Poplar chips sliced by hand with their thickness of 0.8, 0.5, 0.35, 0.25, 0.15mm are investigated saparatly according to rheological parameters by means of the laminated method to make specimen with thickness of 10mm. The results show that the compliance of the chips is higher than that of solid wood with thickness of 10mm, and the compliance increases as the chip thickness decreases. The fact both higher elastic and plastic deformations of chips might be due to occurring in their slicing process causing the damages of strutures both their high molecules and cell wall. The changing tendency in the elastic and plastic deformations resulting from slicing process in certain extent is similar to that those occurring in compression loading. Apart from those factors affecting the rheological behaviour of both solid wood and chips, there are still two factors-chip thickness aud laminating manner with different grain orientations, which have remarkable effects on the rheological behaviours of chips.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1989年第6期522-528,共7页
Scientia Silvae Sinicae
关键词
白杨
刨片
横纹压缩
流变性能
Poplar Chips
Comperssion Perpendicular to Grain
Rheological Behaviour
Elastic Deformation
Plastic Deformation, Compliance
