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Stress Grading of Swedish and German Timber: A Comparison of Machine StressGrading and Three Visual Grading Systems

机译：瑞典和德国木材的应力分级：机械应力分析与三种视觉分级系统的比较

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The report describes a project in which spruce timber (Picea abies) from Germanyand Sweden was graded visually and by machine, and subsequently tested to failure. Grading was carried out according to the Nordic T-rules, the German DIN 4074 and the ECE rules. The timber was also passed through two types of grading machines, a Computermatic and a Cook Bolinder. From bending tests on 58x120 mm timber it appears that the three visual grading systems correspond well. For 34x145 mm timber tested in tension, good agreement was only found between the Nordic T2 and the German DIN 4074 S10 grade. The relation between strength and the flatwise modulus of elasticity based on data from the grading machines was virtually identical for German and Swedish timber. Combination of stiffness data from the grading machine with edge knot size increases the accuracy of the grading considerably.

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作者
Brundin, J.; Gruber, R.;
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年度 1992
页码 1-98
总页数 98
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Structural timber; Mechanical properties; Standards; Evaluation; Bend tests; Lumber; Sweden; Moisture content; Wood products; Germany; Tension tests; Failure; Strength; Stiffness;

机译：结构木材;机械性能;标准;评估;弯曲试验;木材;瑞典;含水量;木制品;德国;拉伸试验;失效;强度;刚度;

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Stress Grading of Swedish and German Timber: A Comparison of Machine StressGrading and Three Visual Grading Systems

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