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Silva Fennica 1926-1997
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Acta Forestalia Fennica
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Articles by Arvo Ylinen

Category : Article

article id 4626, category Article
Arvo Ylinen. (1952). On the mechanic theory of the stem form of trees. Silva Fennica no. 76 article id 4626. https://doi.org/10.14214/sf.a9098
Keywords: stem form; wind velocity; wind break; wind resistance
Abstract | View details | Full text in PDF | Author Info

There are three theories regarding the stem form of trees. The stem form plays a role in ability of the tree to resist wind and wind breaks. This article presents the theory and experiments about mechanic stem form theory. The wind velocity in a forest stand and the coefficient of resistance at the tree crone and at the tree stem are calculated. The hypothesis about the point when the tree stem breaks is discussed. The approximate values of different calculations are presented. 

  • Ylinen, E-mail: ay@mm.unknown (email)

Category : Article

article id 7358, category Article
Arvo Ylinen. (1942). The effect of the amount of the summer wood on the elastic and tensile properties of coniferous trees. Acta Forestalia Fennica vol. 50 no. 5 article id 7358. https://doi.org/10.14214/aff.7358
Keywords: coniferous trees; tensile properties; elasticity; summer wood; autumn wood; linear function
Abstract | View details | Full text in PDF | Author Info

The dependence of elastic and tensile properties of coniferous trees on the share of summer wood can be presented as linear functions, if the soft wood is considered as a statically indefinite structure. By eliminating the share of summer wood by a certain function presented in the article, the elastic and tensile properties are the linear functions of density.

The functions are proved right by conducting strength tests on pine. Practical implications of the derived functions in rating the quality of wood are also presented.

The PDF contains a summary in Finnish. 

  • Ylinen, E-mail: ay@mm.unknown (email)

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