Besides affecting the normal fluctuations of power between and within species, many other factors, the strength of the wood.
If the direction is not parallel to the longitudinal axis of a piece of wood, is said to be multi-grain (sometimes referred to as current). Cross grain spiral in the tree or how to create stuff. suspended in parts of furniture, such as legs and linear axis, the output of the longitudinal properties such as strength, cross grain causing severe loss of power. Compression wood, in response conifers by leaning forward or backward is formed is usually higher in density and compressive strength of ordinary wood, but wood is weaker in tensile strength and modulus of rupture and modulus of elasticity in both bending. In hardwood, the tension of the wood is very weak in compression parallel to grain, but it can be stronger in tension and harder than normal wood with the same density. abnormally high longitudinal shrinkage and a slight increase in the shrinkage becomes radial, but normal. The lignin content of the cell wall is poor compared gelatinous available for traditional wood and fiber.
When wood dries than the fiber saturation point, the force increases with the loss of water. The largest increases were in compression along the grain boundaries: The force is roughly double when the wood dries in 12% humidity, tripled to dry in the oven. Bending strength is much smaller increase, and the elastic modulus is increased by drying.
Strength of wood is also affected by temperature, so the temperature is reduced, which decreases with increasing temperature. The extent and duration of the natural fluctuations of temperature and force are temporary. If, however, can lead to temperatures above the natural or long-term, permanent loss of strength suspended. Effects of heat reduction in force, are larger, at least in dry air, humid air or steam. The use of steam bending wood for temporarily plasticizing solid furniture is well known.
Wood strength is also the duration of the load together. weather-yield timber reduces the tax on long lead times. The destructive effects of insects living in wood, like termites, carpenter ants and beetles live little effect, as the physical loss of the timber will result in a disproportionate loss of strength. Fungi are a major cause of degradation of the wood. For filamentous fungi the hyphae that develop in wood, four main requirements are necessary: low temperature (70-85 ° F is ideal), oxygen (20% or more of the volume of air in the wood), moisture (from fiber tip saturation or more ideal), eating e. fungal staining of wood stored in the sapwood parenchyma cells, but not attack the cell walls. Please note that deposits Chlorociboria a green dot in the forest and leads to loss of strength. Controlling humidity is the main way to prevent tooth decay. If the wood is kept below 20% moisture, rot fungi can not develop. Households often have gates and a number of small businesses that they need. If you want something that works well in the long run, go ahead, what do you see the fence.
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