Relationships between Strength Properties and Density or Ultrasonic Velocity of Timber Attacked by Termite
Relationships between Strength Properties and Density or Ultrasonic Velocity of Timber Attacked by Termite
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受白蚁侵害的木材强度特性与密度或超声波速度的关系
DOI：
10.2472/jsms.59.297
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
K. Komatsu
中科院分区：
文献类型：
--
作者：
Takuro Mori;Akihiro Kousoku;Y. Yanase;K. Komatsu
评估木构件和木基材料在白蚁或木材破坏真菌侵袭下的强度下降对于木结构的长期维护是重要的。木构件和木基材料的强度和生物退化程度之间的关系没有得到适当的评价，尽管很少有技术使用螺丝刀，触诊或其他仪器来评价木结构的生物退化程度。采用弯曲试验和横纹压缩试验对3种白蚁危害木材的强度进行了评价，并研究了木材强度与超声波密度和声速的关系。结果表明，欧洲云杉的危害程度较其他树种大。因此，受侵木材的密度与抗弯强度和杨氏模量呈正相关。受侵木材的超声波传播速度与抗弯强度和杨氏模量之间存在松散的相关性。在选取欧洲云杉材料的情况下，超声波的传播速度与抗弯强度或杨氏模量之间表现出良好的相关性。另一方面，没有发现密度和超声波速度与抗压强度和杨氏模量正相关。
To evaluate a decrease in strength of wooden members and wood-based materials attacked by termites or wood-destroying fungi is important for long-term maintaining of wooden constructions. The relationships between strength and degree of biodeterioration of wooden members and wood-based materials were not evaluated properly, though there were few techniques for evaluating the degree of biodeterioration in wooden constructions using screwdriver, palpation or other apparatus. In this study, the strengths of three species of wood attacked by termites were evaluated using bending test and compression test of perpendicular to the grain, and the relationships between the strength and the density or the velocity of ultrasonic in the attacked wood were also investigated. As the results, European spruce specimens had large damage comparison with other species. Thus the density of attacked wood was positively correlated with the bending strength and young's modulus. The velocity of ultrasonic in attacked wood was loosely correlated with the bending strength and young's modulus. In the case of picking up the European spruce material, between the velocity of ultrasonic and bending strength or young's modulus showed good correlation. On the other hand, it was not found that the density and the velocity of ultrasonic were positively correlated with the compression strength and young's modulus.