WOOD

Erscheinungsjahr 2006
ISBN: 978-0-87849-186-5
Verlag: Trans Tech Publications

Sonstiges, Englisch, 419 Seiten, Format (B × H): 125 mm x 142 mm, Gewicht: 200 g

One of the oldest construction materials is wood which, technically speaking, belongs to the group of polymer matrix composites; one which is conveniently and expertly produced by Nature. Due to its organic cell-type structure, the density of wood remains modest. Thus, as its strength and stiffness can - in certain cases - attain remarkable values, its levels of specific strength and stiffness (absolute strength or stiffness divided by density) can reach magnitudes which are competitive with those of other construction materials. It is demonstrated, for instance, that the specific strength of wood in the axial direction can exceed those of low-carbon steel and concrete. Its specific stiffness can also be comparable to those of aluminum alloys and low-carbon steels, and is better than that of concrete. In constructional design, especially in the dimensioning of supports, the values of specific strength and stiffness are of utmost importance.

Autoren/Hrsg.

Kettunen, Pentti O.

Fachgebiete

• Technische Wissenschaften Maschinenbau | Werkstoffkunde Technische Mechanik | Werkstoffkunde

Inhaltsverzeichnis

1.1 Macroscopic Structure1.2 Microstructure1.3 Structure of the Cell Wall1.4 Constituents of the Structure of Cell Walls1.5 Arrangement of the Structural Components in the Cell Wall1.6 The Branches1.7 Cell Structure of the Outer Surface1.8 Structural Defects2.1 Motion of Liquids in the Structure of a Living Tree2.2 Moisture of Wood2.3 Moisture Content of Timber2.4 Measurement of Moisture. 2.5 The Influence of Moisture on the Dimensions of Wood2.6 Exercises3.1. Essence of Density. Factors Having an Influence on the Density3.2 Porosity3.3 Exercises4. Thermal Properties. 4.1. Linear Thermal Expansion4.2 Hygrothermal Deformation4.3 Thermal Conductivity4.4 Thermal Insulation4.5 Specific Heat. 4.6 Heat Value4.7 Thermal Diffusivity. 4.8 Comparison of the Thermal Properties of Wood and other Materials4.9 Summary of the Thermal Properties4.10 Exercises5. Mechanical Properties. 5.1. Elastic and Anelastic Properties5.2 Strength under Monotonic Short-Term Loading5.3. Creep, Strain and Strength under Long-Term Unidirectional Constant Loading5.4 Fatigue5.5 Strength under Repeated Unidirectional Loading5.6 Fracture and Fracture Strength5.7 Summary of the Mechanical Properties5.8 Exercises6.1 Conductivity and Resistivity6.2 Permittivity6.3 Power Factor6.4 Dielectric Strength. 6.5 Piezoelectricity6.6 Exercises7.1 Speed of Sound7.2 Absorption of Sound Waves and other Vibrations7.3 Intensity of Sound. 7.4 Impedance, Reflection Factor and other Acoustic Properties7.5 Exercises8.1 Degradation and Damage Caused by Living Nature8.2 Degradation Caused by Lifeless Nature8.3 Deterioration Caused by Handling8.4 Exercises9.1 Degradation of the Structural Constituents9.2. Degradation by Corrosion9.3. Exercises