Modulus of elasticity of Norway spruce saw logs vs. structural lumber grade
Modulus of elasticity of Norway spruce saw logs vs. structural lumber grade
复制标题
挪威云杉锯材的弹性模量与结构木材等级的比较
DOI：
10.1007/s00107-005-0091-7
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
M. Reale
中科院分区：
文献类型：
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作者：
J. Edlund;H. Lindström;F. Nilsson;M. Reale
结构木材需要坚硬、笔直和无变形，以符合现有的国际标准。在瑞典，有一套标准/证书[？，?]用来给结构木材分级的由于结构木材的定价遵循结构木材等级，因此只使用产生具有可接受结构等级的木材的锯材原木应该具有很大的经济效益。近年来，声学技术已被认为是一种潜在的技术，用于将锯材原木分类为弹性模量的类别。目前的研究，在瑞典中部的一个锯木厂进行，探讨了828挪威云杉（云杉）锯原木和结构木材等级约800吨的动态弹性模量之间的协议。从这些原木上锯下的2800块木材。该研究表明，弹性模量的跨度很大（约。9-24 GPa）的日志。在锯材原木的弹性模量（代表两种常见的直径等级/锯切模式）和锯材的结构等级之间观察到了相当的一致性（根据Anon（1995），Anon（2000））。因此，通过排除具有低弹性模量的原木，锯木厂可以避免生产低质量/低价值的结构木材。
Structural lumber needs to be stiff, straight, and distortion free to comply with existing international standards. In Sweden there are set standards/certificates [?, ?] that are used to grade structural lumber. As pricing of structural lumber follows the structural lumber grade, there should be large economic benefits from using only saw logs that yield lumber with an acceptable structural grade. In recent years, acoustic technology has been considered as a potential technology for sorting saw logs into classes of modulus of elasticity. The current study, undertaken at a sawmill in central Sweden, explored the agreement between the dynamic modulus of elasticity of 828 Norway spruce (Picea abies) saw logs and structural lumber grade for ca. 2800 pieces of lumber sawn from these logs. The study showed a large span in modulus of elasticity (ca. 9–24 GPa) of logs. A fair agreement was observed between the modulus of elasticity of saw logs (representing two common diameter classes/sawing patterns) and the structural grade of the sawn lumber (according to Anon (1995), Anon (2000)). Thus, by excluding logs with low modulus of elasticity, sawmills could avoid production of low quality/low value structural lumber.