Temat: trees mechanical properties - Katalog OPAC zbiorów

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Tytuł:: Optymalizacja kształtu i struktury drzewa według teorii jednorodnego rozkładu naprężeń
Optimization of tree structure and shape according to axiom of uniform stress
Autorzy:: Zajaczkowska, U.
Powiązania:: https://bibliotekanauki.pl/articles/972902.pdf
Data publikacji:: 2006
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: wlasciwosci mechaniczne
wzrost roslin
biomechanika
rozklad naprezen jednorodny
obliczenia
lesnictwo
drzewa lesne
trees mechanical properties
biomechanics
adaptive growth
axiom of uniform stress
mechanical self−optimization of trees
Opis:: A review of optimization methods based on the axiom of uniform stress and finite element method (FEM) developed by Mattheck is given. Computer−aided optimization (CAO) and computer−aided internal organization (CAIO) methods for modeling adaptive growth of trees are described. Examples of mechanical self−optimization of internal structure and tree shape under various environmental conditions e.g. control of spiral grain formation, xylem ray structure, stem wound regeneration, sable−shaped tree stems, root system growth are discussed.
Źródło:: Sylwan; 2006, 150, 04; 53-58
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Charakterystyka jakości technicznej drewna paulowni COTE-2
Characteristics of the technical properties of Paulownia COTE-2 wood
Autorzy:: Lachowicz, H.
Giedrowicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/978955.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Leśne
Tematy:: mechanical and physical properties
wood of fast growing trees
Paulownia COTE-2
Opis:: Seedlings of Paulownia (Paulownia sp.) has increasingly appeared in the merchant offers in Poland. However, the knowledge of the technical characteristics of its wood is still insufficient because comprehensive studies of wood properties for this species have not been performed. The main aim of this study was to determine the selected physical and mechanical properties of Paulownia COTE−2 wood. The wood comes from the plantation of Paulownia COTE−2 located in Granada region in Spain. The investigation were carried on 162 samples, according to Polish standards. We analysed the following physical properties: air−dry density, oven−dry density, basic density, proportion of wood substance, wood porosity, total shrinkage of wood in longitudinal, tangential and radial anatomical directions, volumetric shrinkage, coefficients of each of mentioned shrinkage, the anisotropy index of shrinkage and mechanical properties: compression strength, static bending, modulus of elasticity in static bending, including the coefficients of the mechanical properties mentioned before. The results show that Paulownia wood is very light, with the density of 270 kg/m3 and low shrinking (volumetric shrinkage equaled to 7%). The mechanical properties of Paulownia wood are closely related to its density. Static bending equaled to 38 MPa and compression strength parallel to grain amounted to 24 MPa.
Źródło:: Sylwan; 2020, 164, 05; 414-423
0039-7660
Pojawia się w:: Sylwan
Dostawca treści:: Biblioteka Nauki

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