Key Terms Flashcards
(155 cards)
Manufactured board
A man made, wood based composite material
Stock form
The set of standard sizes in which materials are available, as well as the format
Physical properties
Associated with the actual make up or structure of the material
Compressive strength
The ability to withstand being crushed or shortened by pushing forces
Tensile strength
The ability to resist stretching or pulling forces
Hardness
The ability to resist abrasive wear such as scratching, surface indentation or cutting
Toughness
The ability to absorb impact without fracture
Composite
A material comprised of two or more different materials, resulting in a material with enhanced properties
Smart material
A material whose physical properties change in response to an input or change in the environment
Modern material
A material developed through the invention of new or improved processes
Ferrous metal
Metal containing mostly iron and carbon
Non-ferrous metal
Metal not containing iron
Alloy
A metal made of two or more metals, or combining two or more elements, one of which must be metal
Thermoplastic
Material that can be repeatedly reheated and reshaped
Thermosetting polymer
A material which when heated undergoes a chemical change whereby the molecules form rigid crosslinks. Cannot be reheated or reshaped
Elastomer
Materials which at room temperature can be deformed under pressure
Air seasoning
Traditional inexpensive method involving stacking wood under a shelter. Air circulates between planks to slowly remove excess moisture
Kiln seasoning
More expensive but controlled method. Quick, takes a few weeks. Planks stacked on trolleys and placed in a kiln where both temp and humidity are controlled
Rough sawn
Wood comes directly from seasoning and has rough surfaces produced from initial conversion. Nominal sizes not accurate finishes
PSE
Planed square edge. One square edge, rest is rough. PSE 3mm smaller than rough edge
PAR
Planed all around. All sides and edges, square, straight and level. Smooth finish and ready to use
Safe working temperature (polymers)
The temperature deemed safe for processing without possible degradation of the polymer properties
Work hardening
Improved tensile strength and hardness in the localised area when a metal is cold worked
Annealing
Heating work hardened metal and very slowly cooling it, making it easier to work by making it less brittle and more ductile