Physical And Mechanical Properties Of Wood

Mechanical Properties of Wood
(Behaviour of Wood under applies forces )
For example: strength, stress, strain, toughness, stiffness, elasticity..

An understanding of wood and moisturerelationships is of great importance to the manufacture and use of wood products, as is an understanding of the mechanical properties of wood.
And, just as shrinking and swelling of wood vary in the radial,tangential, and longitudinal directions, so do various mechanical properties of wood.
So, wood is anisotropic in both its hygroscopic behavior as well as its mechanical behavior.

Wood is one of themost useful raw materials for human beings. Wood can be used for building houses, bridges, chairs, tables, and other things…

One thing we have to know before building a house is “how strong is thewood?”
Wood is an elastic material, which is bent, but not broken, when the load is small.
But if the load is too big, then the wood will break.
(Tabla de Resistencia de las maderas)
The elasticnature of Wood is illustrated in the next slide. The degree of deformation a piece of wood will undergo is proportional to the amount of load applied.
Wood is elastic up to a point, called theelastic or proportional limit. If loads are applied below the elastic limit and then removed, the wood will go back or spring back to its original shape. If a load is applied that exceeds the elastic limitand is then removed, the wood will go back only partially to its original chape. This is because the load applied was too much for the wood to stand and damage to the wood occurred.
If the appliedload is very, very high, the wood is no longer able to support this high load and the wood breaks.

Wood behaves in an elastic manner up to a point called the elastic or proportional limit.
Thismeans that for values of load below the elastic limit, the load and deflection are proportional to each other.
Once the load level passes the elastic limit, the load and deflection are no longer...