For isotropic materials the coefficients linear thermal expansion α and volumetric thermal expansion αV are related by αV = 3α. For liquids In the table below, the range for α is from 10 K for hard solids to 10 K for organic liquids. The coefficient α
Steel Stainless Austenitic (310), 8. Steel Stainless Austenitic (316), 8.9. Steel Stainless Ferritic (410), 5.5. Strontium, 12.5. Tantalum, 3.6. Tellurium, 20.5. Terbium, 5.7. Terne, 6.5. Thallium, 16.6. Thorium, 6.7. Thulium, 7.4. Tin, 12.8. Titanium, 4.8. Tungsten, 2.5. Uranium, 7.4. Vanadium, 4.4. Vinyl Ester, 8.7 - 12. Wood, fir, 2.1.
The thermal expansion of wood in the direction of the grain is very little. In the radial and tangential directions, temperature movements are much greater. The relationship between the thermal expansion coefficients and moisture contraction coefficients of wood in different directions relative to the grain is in the same class in
The wood thermal expansion coefficient is comparatively small. It has minor impact at temperatures above 0 ° C, because the movements caused by changes in moisture content is completely dominant. At temperatures below 0 ° C, the differences in temperature at different depths in the wood cause tension that can provide
Thermal expansion, wood members under ISO-fire exposure, timber-concrete composite slabs, calculation model for Calculation model. The influence and effects of thermal expansion on the structural behaviour of timber thermal strains εth,i are calculated taking into account the coefficient of thermal expansion αT as:.
Density and Specific Gravity 4–7. Thermal Properties 4–10. Thermal Conductivity 4–10. Heat Capacity 4–11. Thermal Diffusivity 4–12. Coefficient of Thermal Expansion 4–14. Electrical Properties 4–15. DC Electrical Properties 4–15. AC Electrical Properties 4–16. Friction Properties 4–17. Nuclear Radiation Properties 4–17.
The thermal expansion of wood, however, is quite small and requires exacting techniques for its measurement. The effect of temperature on plywood dimensions is related to the percentage of panel thickness in plies having grain perpendicular to the direction of expansion or contraction. The average coefficient of linear
THERMAL CONDUCTIVITY. The thermal conductivity coefficient λ for wood products is moisture dependent. The thermal conductivity coefficients for Kerto products are presented in Table 1. For calculation of thermal insulation, the thermal conductivity of 0.13 W/(m K) should be used for Kerto products. HEAT CAPACITY.
Conductivity 3–15. Heat Capacity 3–17. Thermal Diffusivity 3–17. Thermal Expansion Coefficient 3–21. Electrical Properties 3–21. Conductivity 3–21. Dielectric Constant 3–22. Dielectric Power Factor 3–22. Coefficient of Friction 3–22. Nuclear Radiation 3–23. References 3–23 he versatility of wood is demonstrated by a
at temperatures from room temperature to 250 °C. Three equatorial and one meridional d-spacings showed a gradual linear increase with increasing temperature. For temperatures above 180 °C, however, the equatorial d-spacing increased dramatically. Thus, the linear and volume thermal expansion coefficients (TECs)
ing, and cross-banding on the values of a were determined on a series of 23 birch laminates. The values of a for papreg and hydrolyzed-wood plastic were also determined. General formulas were developed that permit calculation of the coefficients of linear thermal expansion of wood in any grain direction of the specimen.
planning the experiments, for designing the processes of heat transfer, for designing the furniture and wooden houses, for designing the machines and equipment in woodworking industry and others. Keywords: wood, specific heat, thermal conductivity, thermal diffusivity, coefficient of thermal expansion
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