Density profile relation to hardness of viscoelastic thermal compressed (VTC) wood composite

作者：Rautkari Lauri^*; Kamke Frederick A; Hughes Mark

来源：Wood Science and Technology, 2011, 45(4): 693-705.

DOI：10.1007/s00226-010-0400-0

Density profile relation to hardness of VTC wood composites was evaluated using X-ray densitometry and modified Brinell hardness method using different applied forces. Moreover, surface elasticity was evaluated. Prior to lamination, the low-density hybrid poplar (Populus deltoides x Populus trichocarpa L.) and Douglas-fir (Pseudotsuga menziesii L.) thin boards were compressed to 1.22 or 1.14 g/cm(3), respectively. Two different kinds of laminations were made, either single layer of 1.5 mm thickness or two 1.5-mm layers bonded to unmodified wood. The results show that thicker laminate has a great positive influence on Brinell hardness. This study suggests that results from the existing method for Brinell hardness are not comparable, and if applied force is chosen without restraint, the effect on the hardness value is significant for inhomogeneous wood composites.

• 出版日期2011-11