Credit hours
In-class work per week |
Practice per week |
Credits |
Duration |
Total |
2 |
2 |
8 |
15 weeks |
120 hours |
Instructor
José Nivaldo Garcia
Objective
Develop the students perception of the properties obtained and motivate them to reflect on the fidelity of the essays in the sense of discovering the pure properties. To focus the natural variability of the basic properties of the wood within forest populations according to their nature (native or planted), age, species, rate of growth, etc., and motivate the discussion of their cause and the appropriate control techniques within the management and breeding. Apply destructive and non-destructive tests and discuss the advantages, disadvantages, similarities and differences of the results obtained. To present technologies applied to the alteration of physical and mechanical properties of wood.
Content
1. Verification of the operation of wood structures under applied loads
2. Identification of 4 physical and 4 mechanical properties responsible for the operation of these structures
3. Destructive and non-destructive tests
4. Installation of experiments to obtain each of these properties, focusing on: - definition of the experimental design - pre-sampling - physical and mechanical tests - statistical analysis of the data - presentation of the results in the form of a seminar
5. Defects associated with the Physical and Mechanical Properties of Wood. - Growth stress - Reaction wood - Juvenile wood - Knots - Marrow - Cracks - Bonding - Retractions - Twisting
6. Study of the variability of these properties and their associated defects in planted forests: - in the tree: longitudinal and radial - in the site: between classes, between trees - in the population: between extracts - in the species: between populations
7. Control over physical and mechanical properties: - by forest management - by forest improvement - by technologies for the processing of roundwood in sawn wood - by technologies for the use of forest products
8. Genetic parameters - heritability of technological properties - selection gains
9. Technology for modification of physical and mechanical properties: thermal treatment, surface activation, microwave, wood densification, lignin plastification by temperature
Bibliography
ENTWISTLE, K. et al. The effect of saw kerf width on the value of the axial growth stress measured by slitting a log along its axis. Wood Material Science and Engineering, v. 11, n. 1, p. 1–12, 2016.
CHAUHAN, S.; ENTWISTLE, K. Measurement of surface growth stress in Eucalyptus nitens maiden by splitting a log along its axis. Holzforschung, v. 64, n. 2, p. 267–272, 2010.
PANSHIN, A. J. & ZEEUW, C. de. Textbook of wood technology. New York, 3 ed. McGrawn - Hill. vl. 1970. 705 p.
PFEIL, W. Estruturas de madeira: dimensionamento segundo as normas brasileiras NB 11 e os modernos critérios das normas alemãs e americanas. Rio de Janeiro, Livros Técnicos e Científicos. 1978. 253 p.
POLGE, H. Utilisationdesspectres de diffractiondesrayons x pourlesétudes de qualitédu bois. Nancy, 1966 (Tese - Doutorado - UN/Fr.). 215 p.
POST, I. L. An investigation of the longitudinal growth stresses in Trees. New York, 1979 (Tese - Doutorado - SUNY/USA). 108 p.
Schacht, L. & Garcia, J. N. Variação entre e intra clones nas rachaduras de topo em Eucalyptusurophylla S. T. Blake. Colombo: EMBRAPA, 1997. V. 3, p. 401-404. IUFRO. ConferenceonSilvilcultureandImprovementofEucalyptus, Salvador, 1997.
Schacht, L. & Garcia, J. N. Variação genética de indicadores de tensões de crescimento em clones de Eucalyptusurophylla. Colombo: EMBRAPA, 1997. V. 3, p. 405-410. IUFRO. ConferenceonSilvilcultureandImprovementofEucalyptus, Salvador, 1997.
TIMOSHENKO, S. Mecânica técnica. Rio de Janeiro, 3 ed. Livros Técnicos e Científicos. 1979. vl.
TIMOSHENKO, S. Resistência dos materiais. Rio de Janeiro, livros Técnicos e Científicos. 1979. 2v.
TIMOSHENKO, S. & GOODIER, J. N. Teoria da elasticidade. Rio de Janeiro, Guanabara. 1980. 545 p.
WALLIS, N. K. Australian timber handbook. Sydney, Halstead. 1963. 391 p.
WILKINS, A. P.; KITAHARA, R. Silvicultural treatments and associated growth rates, growth strains and wood properties in 12.5-year-old Eucalyptus grandis. Australian Forestry, V. 54, n.1/2, p.99-104, 1991.
USDA-FPL. Wood Handbook: wood as na engineering material.1999. 463p.
Papers:
Australian Forestry, Australian Forestry Industry Journal, Australian Journal of Applied Science, Australian Journal of Scientific Research. Canadian Journal of Forest Research, Forest Products Journal Forest Science, Holz Alz Roh - Und Werkstoff, Holzforschung, IPEF/Scientia Forestalis, IUFRO Proceedings, South African Forestry Journal, Wood and Fiber Science, Wood Science and Technology.