Term
|
Definition
| the quanitity of water that is contained in a material; weight of the water expressed as apercentage of the moisture free or oven dry wood weight |
|
|
Term
|
Definition
| point at which all the liquid water in the lumen has been removed but the cell wall is still saturated; critical level because below the FSP wood properties are altered by the change in MC |
|
|
Term
| Equilibrium Moistrure Content |
|
Definition
| MC at which a wood based product attains while in an evorinment of constant temperature and humidity; the MC at which wood the wood is niether gaining or losing water to or from its surroundings; can vary with humidity, type of wood, history, and temperatures its been exposed to; can't be above FSP |
|
|
Term
|
Definition
| the attraction of water moelcules to hydrogen-bonding present in cellulose, hemi-cellulose, and lignin |
|
|
Term
|
Definition
| is the bulk accumulation of water throught capillary and surface tension means |
|
|
Term
|
Definition
| liquid water that is found in the lumen and is first removed during drying; easily removed as well |
|
|
Term
|
Definition
| liquid water that is found in the cell wall of a wood cell; it's held more tightly becuase of surface adsorption in the cell wall so it's harder to remove |
|
|
Term
|
Definition
| dissolved food materials produced by photsynthesis as well as organic and inorganic compounds |
|
|
Term
|
Definition
| the difference in the desorpiton and adsorption curves; lag effect |
|
|
Term
|
Definition
| wood that has been dried or seasoned so that the MC is below the FSP |
|
|
Term
|
Definition
| a substance that has the ability to attract and hold water from their surrounding environment |
|
|
Term
|
Definition
| relatoinship between the relative vapor vapor pressure in the environment and the mositure content of wood in equilibrium with that environment at a constant temperature |
|
|
Term
|
Definition
| wood that has been recently cut and still has a relatively high MC |
|
|
Term
|
Definition
| the amount of shrinkage that occurs when a piece of wood is dried |
|
|
Term
|
Definition
| the amount of swelling that occurs when a piece of wood takes in wood |
|
|
Term
|
Definition
| the trasnportaiton of water or any other material from a high concentration gradient to low concentration gradient to balance it out |
|
|
Term
|
Definition
| normalized measure of dispersion for a variation of a certain material |
|
|
Term
|
Definition
| fundamental property of all materials that meaures its haveiness or how tightly packed the substance is |
|
|
Term
|
Definition
| the heaviness of a material compated to that of water |
|
|
Term
|
Definition
| the amount of wood that contains voids or pores |
|
|
Term
|
Definition
| abilit of a material to carry applied loads or forces; can vary highly depending what strength is being measured |
|
|
Term
|
Definition
| a measure of strength to resist a force that is applied |
|
|
Term
|
Definition
| change in shape that instantly take place as a load is applied and are revoverable when load is removed |
|
|
Term
|
Definition
| a load that is slowly applied and when it is removed it's not recoverable |
|
|
Term
|
Definition
| a property that is time-dependent like for example a strength for compression will eventually dwindle due to the constant load the material has had to bear |
|
|
Term
|
Definition
| any use for which strength is one of the primary criteria for selection of a material |
|
|
Term
|
Definition
| the ratio of stress to strain a material; a measure of inelasticity or stiffness |
|
|
Term
|
Definition
| the max load that a rectangular beamcan withstand before it ruptures |
|
|
Term
|
Definition
| measure of stiffness of an elastic material and is a quantity used to characterize materials. It is defined as the ratio of the uniaxial stress over the uniaxial strain in the range of stress in which Hooke's law holds |
|
|
Term
|
Definition
| a distributed force per unit area |
|
|
Term
|
Definition
| internal stresses that can distort and deform the shape and size of a material's body |
|
|
Term
|
Definition
| The greatest stress a material can sustain without departure from linear proportionality of stress and strain. |
|
|
Term
|
Definition
| an axis in the cross section of a beam (a member resisting bending) or shaft along which there are no longitudinal stresses or strains |
|
|
Term
|
Definition
| 2 forces or loads acting along the same axis trying to shorten or reduce the volume of the wood |
|
|
Term
|
Definition
| 2 forces or loads acting along the same axis to lengthen a dimenison or increase the volume of the woods |
|
|
Term
|
Definition
| load applied so that one part of a material slips past the material adjacent to it |
|
|
Term
|
Definition
| when a force is applied the top portion is stresssed in compression and the bottom in tension; shortening the top and lengthening the bottom |
|
|
Term
|
Definition
| amount of bending at the midpoint of a beam |
|
|
Term
|
Definition
| continued deformation over time under a CONSTANT LOAD; due to slippage of of the long-chain molecules in wood |
|
|
Term
|
Definition
| a materails that has the same mechancical properties in all directions |
|
|
Term
|
Definition
| a materail that has different mechanical properties in three orthogonal axes of the material |
|
|
Term
| Parallel-to-Grain Property/ Perpendicular |
|
Definition
| various properties that are stronger parallel to the grain or perpendicular to it |
|
|
Term
|
Definition
| the hardness of a wood's surface when it is expose to a load |
|
|
Term
|
Definition
| a hammer of given weight is dropped upon a beam from successively increased heights until rupture occurs or the beam deflects 152 mm (6 in.) or more |
|
|
Term
|
Definition
| bility to absorb shock with some permanent deformation and more or less injury to a specimen. Work to maximum load is a measure of the combined strength and toughness of wood under bending stresses. |
|
|
Term
|
Definition
| strength degrading factors and values that have been adjusted to consdier safety of the material |
|
|
Term
|
Definition
| the grain direction in a piece of wood; if it isn't precisely parallel to the board edfes strength will be lower than if the edges and the wood ifvers were parallel |
|
|
