What are the four classifications of composite?
Composites are usually classified by the type of material used for the matrix. The four pri- mary categories of composites are polymer matrix composites (PMCs), metal matrix compos- ites (MMCs), ceramic matrix composites (CMCs), and carbon matrix composites (CAMCs).
Which of the following composites are dispersion strengthened composites?
Dispersion-strengthened composites are materials in which crystalline reinforcement particles, e.g., alumina or zirconia, are dispersed throughout a glass matrix, e.g., a feldspathic glass.
What are the types of composites?
The reinforcements are used to strengthen the composites. This chapter discusses four types of composites—namely, polymer matrix composites, carbon matrix composites, metal matrix composites, and ceramic matrix composites. Polymer matrix composites are plastics (resins) within which there are embedded fibers.
What are the advantages and disadvantages of composite materials in aircraft?
Composite materials do not corrode as easily as other structure types, and they do not crack from metal fatigue the way aluminum does. Instead, they flex, which lets them last longer than metal, which means lower maintenance and repair costs.
Why are composites used in aircraft?
Aviation and Composites. Composite materials are important to the Aviation Industry because they provide structural strength comparable to metallic alloys, but at a lighter weight. This leads to improved fuel efficiency and performance from an aircraft.
Which composites are used in aircraft structures?
Composite materials have played a major part in weight reduction, and today there are three main types in use: carbon fiber-, glass- and aramid- reinforced epoxy.; there are others, such as boron-reinforced (itself a composite formed on a tungsten core).
Where are composites used in aircraft?
Composite materials have played a major role in weight reduction, and hence they are used for both structural applications and components of all spacecraft and aircraft from gliders and hot air balloon gondolas to fighter planes, space shuttle and passenger airliners.
Which material is used in aircraft?
The metals used in the aircraft manufacturing industry include steel, aluminium, titanium and their alloys. Aluminium alloys are characterised by having lower density values compared to steel alloys (around one third), with good corrosion resistance properties.
Why Aluminium is used in aircraft?
Aluminum is ideal for aircraft manufacture because it’s lightweight and strong. Aluminum is roughly a third the weight of steel, allowing an aircraft to carry more weight and or become more fuel efficient. Furthermore, aluminum’s high resistance to corrosion ensures the safety of the aircraft and its passengers.
Why titanium is used in aircraft?
Due to their high tensile strength to density ratio, high corrosion resistance, and ability to withstand moderately high temperatures without creeping, titanium alloys are used in aircraft, armor plating, naval ships, spacecraft, and missiles.
What alloy is used in aircraft?
Aluminum alloys
Where is stainless steel used in aircraft?
Stainless steel alloys have found increasing usage in aircraft components that require great strength but can handle the increased weight. The high corrosion and temperature resistances found in stainless steel make it suitable for a range of aerospace parts, including actuators, fasteners, and landing gear components.
What metals properties are essential in aircraft manufacturing?
Of primary concern in aircraft maintenance are such general properties of metals and their alloys as hardness, malleability, ductility, elasticity, toughness, density, brittleness, fusibility, conductivity contraction and expansion, and so forth.
Why pure metals are not suitable for aircraft construction?
Aluminum as a pure metal is very soft and not suitable for use in making structural components. The addition of other elements creates alloy materials of varying structural strength, corrosion resistance, and workability.
Why is pure Aluminium rarely used for construction?
Pure aluminium is obtained from bauxite, is relatively expensive to produce, and is too soft and weak to act as a structural material. To overcome its low strength it is alloyed with elements such as magnesium.
Why should you not use a wire brush on highly stressed steel parts?
The improper use of steel cleaning products, such as steel wool or a steel wire brush on aluminum or mag- nesium, can force small pieces of steel into the metal being cleaned, which will then further corrode and become anodic and the less active metal to become cathodic, thereby establishing conditions for corro- sion.
How do you fix aircraft corrosion?
Removing corrosion is the only sure fix once it’s found. Light surface corrosion can be removed with abrasion (the specifics of which depend on the metallurgy of the corroded part), then application of a corrosion inhibitor, such as zinc-chromate primer, another primer, and then paint.
What are the 3 keys to corrosion prevention?
Three things are necessary for corrosion to occur: an electrolyte, an exposed metal surface, and an electron acceptor. Corrosion can be prevented by removing one of these conditions. Coating a metal surface with paint or enamel provides a barrier between the metal and the moisture in the environment.
What is the best way to prevent corrosion?
How to prevent corrosion
- Choose the right Metal Type. One of the simplest ways to prevent corrosion is to use a corrosion resistant metal such as stainless steel, duplex, super duplex, nickel alloy or 6% Moly.
- Protective Coatings.
- Environmental Measures.
- Sacrificial Coatings.
- Corrosion Inhibitors.
- Metal Plating.
- Design Modification.
What is the first step in preventing aircraft corrosion?
Cards
| Term In case of a conflict with corrosion control procedures, which manual would take precedence? | Definition NAVAIR 01-1A-509 |
|---|---|
| Term What can be used to dry all types and sizes of equipment and components? | Definition Forced air oven. |
| Term What is the first step in preventing aircraft corrosion? | Definition Cleaning |
When ashore Navy aircraft should be cleaned at least how often?
every 14 days
What is the most common corrosion found on aluminum?
Atmospheric corrosion
What are the factors influencing corrosion in aircraft?
One of the most common factors to cause corrosion on an aircraft is foreign material such as dust, oil, grease, water, battery acids, cleaning solutions and flux residue. All of these factors can cause corrosion if left on the surface of your aircraft for a long period of time.
What are the two general classifications of corrosion?
There are two general classifications of corrosion which cover most of the specific forms. These are: direct chemical attack and electrochemical attack. In both types of corrosion the metal is converted into a metallic compound such as an oxide, hydroxide or sulphate.
Why corrosion is very dangerous in aircraft?
Intergranular corrosion can develop in metals that have been alloyed. This type of corrosion is very dangerous, because the material breakdown cannot be visually confirmed and airframe failure can be the result. If intergranular corrosion is left unchecked, exfoliation of the part will proceed.