Table of Contents
What are the properties of the wood?
The main physical properties of wood include: color, luster, texture, macro-structure, odor, moisture, shrinkage, internal stresses, swelling, cracking, warping, density, sound – electro – thermal conductivity. Сolor, shine, texture and macrostructure determine the appearance of wood.
What is wood used to make?
Wood has been used for thousands of years for fuel, as a construction material, for making tools and weapons, furniture and paper. More recently it emerged as a feedstock for the production of purified cellulose and its derivatives, such as cellophane and cellulose acetate.
What are the engineering properties of wood?
Relationship between Mechanical Properties and Anatomical Structure of Wood
| Property | n | A90/A0 |
|---|---|---|
| Tensile strength | 1.5–2 | 0.04–0.07 |
| Compression strength | 2–2.5 | 0.03–0.40 |
| Bending strength | 1.5–2 | 0.04–0.10 |
| Modulus of elasticity | 2 | 0.04–0.12 |
What are chemical properties of wood?
Wood has the chemical property of flammability. Flammability is the ability of a substance to burn. Ash and smoke cannot burn, so they have the chemical property of non-flammability.
How is wood formed?
Wood formation is a complex biological process, involving five major developmental steps, including (1) cell division from a secondary meristem called the vascular cambium, (2) cell expansion (cell elongation and radial enlargement), (3) secondary cell wall deposition, (4) programmed cell death, and (5) heartwood …
What are the properties and uses of wood?
The mechanical properties of wood include strength in tension and compression (as measured in axial and transverse directions), shear, cleavage, hardness, static bending, and shock (impact bending and toughness).
Which properties of wood make it ideal for making furniture?
These are:
- Density: Higher the density of timber, greater will be its strength.
- Moisture content: Higher the moisture content, lower is the strength of the timber.
- Presence of defects: There may be some of the natural and artificial defects in timber such as cross-grain, knots, and shakes, etc.
What are two wood properties?
The mechanical properties of wood considered in this book are: (1) stiffness and elasticity, (2) tensile strength, (3) compressive or crushing strength, (4) shearing strength, (5) transverse or bending strength, (6) toughness, (7) hardness, (8) cleavability, (9) resilience.
What are some of the properties of wood?
Wood – Wood – Properties of wood: Sensory characteristics include colour, lustre, odour, taste, texture, grain, figure, weight, and hardness of wood. These supplementary macroscopic characteristics are helpful in describing a piece of wood for identification or other purposes.
How does the biological origin of wood affect its properties?
The biological origin of wood implies diversity and variation, between and within different species of trees. These things are among the many factors, which affect wood properties. The fundamental structure of wood, from the molecular to cellular or anatomical level, determines the properties and behavior of wood.
How does density affect the quality of wood?
Source: Adapted from George Tsoumis, Science and Technology of Wood (1991). Density affects the amount of moisture that wood can hold, its shrinkage and swelling, and its mechanical and other properties. In general, density is a measure of the quality of clear wood—that is, wood without defects.
What is the specific gravity of a wood?
All types of wood have Specific gravity below 1. The hardwoods have a specific gravity ranging between 0.7 to 0.9 whereas in most of the softwoods it lies below 0.7. Hardness and strength of wood depend to a great extent on its density.