Properties of Metal
Tensile Strength is the ability for a piece of sheet metal to withstand stress in.....?
tension
What is a ferrous metal?
Any alloy containing iron as its chief constituent
What term refers to all metals which have elements other than iron as their base or principal constituent?
non-ferrous
what is annealing?
a process used to render the metal soft, ductile and stress free, so that further cold working or machining can take place.
The term composite is used to describe?
Two or more materials that are combined to form a structure that is much stronger than the individual components
What does a stress strain curve show you?
1. Ultimate Strength
2. Yield Strength (elastic limit)
3. Rupture
4. Strain hardening region
5. Necking region.
What is the second element found in Steel?
Carbon
What is the most important metal in aircraft engineering?
Aluminium
What gas is used in gas carburising to case harden steel?
Carbon monoxide
The three main parts of a fibre-reinforced composite are the?
Fibre, matrix, and interface or boundary between the individual elements of the composite.
What are 4 other stress's that can affect a piece of metal
Compressive strength is the ability of a metal to withstand pressing or squeezing together
Shear Strength is a metal's ability to withstand shear stress
Torsional strength is the ability to resist rotational shear
Flexural strength is bending strength of a metal
Fatigue strength, or Endurance strength, refers to the ability of a metal to resist repeated loading
Impact strength measures the ability of a metal to resist shock
In Steel, as hardness and tensile strength increase what property decreases?
Ductility
Name 5 non ferrous metals
Aluminum, Copper, Magnesium, Nickel, Titanium, Brass, Bronze, Beryllium, Lead
what two methods are used to test the hardness of a metal?
Brinell and Rockwell methods
Name 5 types of reinforcing fibres:
Fibreglass (Glass Cloth)
Aramid
Carbon / Graphite
Boron
Ceramic.
A metal9s hardness refers to its ability to resist?
cutting, penetration, or abrasion
Name 5 alloying metals added to steel to change the properties of the steel
Nickel, chromium, vanadium, tungsten, manganese, cobalt, chrome, molybdenum
What are High Temperature Corrosion Resistant Alloys sometimes known as?
Superalloys.
What test is used to describe the ability of a material to resist breaking under a stretching force?
Tensile Strength test
Name 2 types of resin
Polyester
Epoxy
A material's ability to be bent, formed, or shaped without cracking or breaking is called?
malleability.
What are some advantages of maraging steel?
Tougher
Simpler heat treatments are possible
Much less distortion during heat treatments
Very much simpler to weld
Easier to machine
Better resistance to stress corrosion and hydrogen embrittlement
Hard chromium plating is used for?
improving sliding and sealing properties, preventing wear and, in thick layers, corrosion
What test is used to test the progressive deterioration of the strength of a material or structural component during service such that failure can occur at much lower stress levels than the ultimate tensile stress of the material.
Fatigue Test
How is "Pre Preg" usually stored?
Many pre-pregs must be stored in a freezer. This requirement must be met. If some pre-pregs are allowed to remain at room temperature for even a few hours, the resins/catalysts start their chemical reaction and begin to cure. The term "out of-freezer life" is the time that the material is actually out of the freezer and is being cut or transported. During this time, the resins are warming up to room temperature and will start to cure. While in the freezer, this chemical reaction is slowed down to allow a longer shelf life. Pre-preg fabrics usually have a limited shelf life even if kept in the freezer. Some pre-pregs must also be shipped in cold storage overnight, which adds to the expense.