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首页> 外文期刊>Wood and Fiber Science >EFFECT OF STRAND GEOMETRY AND WOOD SPECIES ON STRANDBOARD MECHANICAL PROPERTIES
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EFFECT OF STRAND GEOMETRY AND WOOD SPECIES ON STRANDBOARD MECHANICAL PROPERTIES

机译：几何形状和木材种类对木板力学性能的影响

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摘要

This study compared the performance of strandboards made from trembling aspen, a low-density hardwood species, with strandboards made from paper birch, a medium-density hardwood species. Strands were cut into three different lengths (78, 105, and 142mm) and two thicknesses (0.55 and 0.75 mm) to compare the impact of species, strand geometry, specific surface, and slenderaess ratio. Internal bond (IB), modulus of elasticity (MOE), and modulus of rupture (MOR) for flatwise and edgewise bending, compressive strength, and stiffness were all determined. Both species performed equally well in IB (0.73 MPa for both species combined). The highest MOE and MOR values in flatwise and edgewise bending were obtained for long, thin strands and were significantlylower for birch than for aspen panels (flatwise: 13.6 GPa and 99.2 MPa for aspen and 12.1 GPa and 85.5 MPa for birch; edgewise: 13.5 GPa and 66.3 MPa for aspen and 13.2 GPa and 65.7 MPa for birch). Short aspen strands resulted in the highest compressiveproperties, slightly higher than those of short birch strands (aspen: compressive strength 10.4 MPa and stiffness 1.22 GPa; birch: 10.8 MPa and 2.25 GPa, respectively). Strand length must therefore be a compromise between the need for high bending properties provided by long strands and the need for high compressive properties provided by short strands.
机译：这项研究比较了由颤抖的低密度阔叶树种白杨木制成的刨花板与由中等密度的阔叶树种桦木制成的刨花板的性能。将钢绞线切成三种不同的长度（78、105和142mm）和两种厚度（0.55和0.75mm），以比较种类，钢绞线几何形状，比表面积和细长比的影响。确定了平面和边缘弯曲的内部粘结力（IB），弹性模量（MOE）和断裂模量（MOR），抗压强度和刚度。两种物质在IB中的性能均相同（两种物质的总和为0.73 MPa）。长而细的钢绞线在水平和横向弯曲中的最高MOE和MOR值最高，桦木明显低于白杨板（水平：白杨为13.6 GPa和99.2 MPa，桦木为12.1 GPa和85.5 MPa;横向：13.5 GPa白杨为66.3 MPa，桦木为13.2 GPa，桦木为65.7 MPa）。短的白杨纤维束具有最高的压缩性能，比短的桦木纤维束具有更高的压缩性能（aspen：抗压强度为10.4 MPa，刚度为1.22 GPa;桦木：分别为10.8 MPa和2.25 GPa）。因此，股线长度必须在长股线对高弯曲性能的需求与短股线对高压缩性能的要求之间做出折衷。

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