Vinay's Deck Flashcards
What is a Thermosoftening Polymer?
A Thermosoftening Polymer is a type of polymer that becomes soft and pliable when heated and solidifies when cooled. Unlike thermosetting polymers these can be re-melted or reshaped without undergoing any significant chemical change.
Examples of Thermosoftening Polymers
Nylon, Epoxy Resin, Polystyrene, Polyester.
What is Injection Moulding and it’s advantages?
Injection Moluding is a manufacturing process for mass producing parts. This process injects molten material into a mould. Advantages of this method include, low waste, efficient production, little or no post processing, low cost, high detail and high repeatablity.
What is Extrusion and it’s advantages?
Extrusion is a process of create objects with a fixed cross-sectional profile by pushing material throgh a die of the desired cross-section.
Advantages include, good surface finish, flexible operation, high production volume, low cost per part, and post alterations can be conducted easily.
What is Vacuum Forming and it’s advantages?
Vacuum Forming is where a sheet of plastic is heated to a forming temperature, struched onto a single-surface mould then forced against the mould be a vacuum.
Advantages include, high detail, high production speed and reduced equipment costs.
What is Compression Moulding and it’s advantages?
This process sqeezes or compresses a deformable material between two halves of a heated mould. Advantages include, simple process, good for larger and thicker parts, cost effective.
What is Rotational Moulding and it’s advantages?
This process involves a heated mould which is filled with material inside then slowly rotated. This causes the material to stick to the mould and create a hollow inside. Advantages of this include, low tool cost, can make complicated shapes, has uniform thickness and no size limit.
Aluminium in Aircraft
Aluminium is a lightweight metal, known for its exceptional strength, durability and corrosion resistance. It was used in air craft for these qualities about and its, cost-effectiveness and machinablilty.
Aluminium Silicon Alloys in Aircraft
Aluminium Silicon or Al-Si alloys have the same strengths as Aluminium but have increased, strength and hardness, thermal expansion control, wear resistance, thermal conductivity and castability. These alloys can contain from 5% up to 25% of silicon.
Aluminium Silicon Magnesium Alloys in Aircraft
Aluminium Silicon Magnesium also know as Al-Si-Mg alloy is a specific type of alloy which is neccecary for highly corrosive and high strength jobs, as these are its main two improvements on the Aluminium Silicon Alloys.
Aluminium Copper Alloys in Aircraft.
Aluminium Copper or Al-Cu alloys have high strength, fatigue resistance, thermal stability, and electrical conductivity.
Structure correlation to Properties of Alumium
Aluminium has a Face-centered Cubic Crystal Structure, this micrstructure of aluminium allows it to exhibit its properties. FCC structure allows the aluminium to move dislocations, which enables plastic deformation and contributes to its excellent formability.
Structure correlation to Properies of Aluminium Silicon
Aluminium Silicon alloys have a aluminium matrix, the provides, ductility and corrosion resistance. The Silicon phase is the next improvement which act as reinforcement, control for thermal expansion and the rest of the alloys properties.
Structure correlation to Properties of Aluminium Silicon Mgnesium
This has the same properties of Aluminium Silicon but the Magnesium makes the crystals have a set structure and texture instead of being random, this improves strength against corrosion and higher strength.
Structure correlation to Properties of Aluminium Copper
This consists of a Aluminium and copper matrix in its micro structure, this enhances the strength and hardness of the alloy, decreases ductility and has relativety high electrical conductivity.
How is Fibreglass used in Aircraft?
Fibreglass is used in aircraft in several ways due to its lightweight, high strength and corrosion resistance properties. Fibreglass can be used for structural components, interior components, protective shells, ducting and piping, insulation, antenna covers and more.
How is Kevlar used in Aircraft?
Kevlar is a high-strength synthetic fibre which has exceptional tensile strength, lightweight, and resistance to impact and heat. Kevlar can be used for reinforcement, Armor protection, seats and restraints, fire-resistant applications, flexible fuel tanks and composite ducting.
How is Carbon Fibre used in Aircraft?
Carbon Fibre is a lightweight high strength material that is widely used in aircraft manufacturing here are some of the common applications, structural components, wing and fuselage skins, Fan Blades and propellers, landing gear components, control surfaces, interior components, protective shields etc.
How is Fibre Metal Laminate (FML) used in aircraft?
Fibre Metal Laminate (FML) also known as Glare is a hybrid material that combines layers of metal and fibre-reinforce polymer composites. Some of the applications of this in aircraft include: Aircraft fuselage panels, wing panels, repair and reinforcement, landing gear components, and protective shields.
Fibreglass Structure/properties relationship
The Structure of fiberglass, which is composed of glass fibres embedded in a polymer matrix directly influence its properties. The Glass fibre orientation offer high strength. The longer the fibres are then the more improved strength and stiffness. The polymer matrix acts as a binder protecting the fibres from environmental damage providing resistance to chemicals and distributing loads evenly, this can also improve stiffness, strength and toughness.
Kevlar Structure/properties relationship
The structure of Kevlar, a high strength synthetic fibre, impacts the properties in many ways. The polymer chain alignment enhances the fibres tensile strength. High crystallinity makes Kevlar have an increase in strength, stiffness, and resistance to impact. High aspect ratio, this allows it to distribute loads along the length of the fibre resulting in high tensile strength and modulus.
Carbon Fibre Structure/properties relationship
Carbon Fibre has its properties from its composition, which are covalently bonded forming strong stable structures. Its Crystalline structure means that its atoms are densely packed contributing to high tensile strength and stiffness. The Graphitic structure, being like graphite it gives the material exceptional strength, stiffness and thermal conductivity. It also has a high aspect ratio allowing it to apply loads across the whole length leading to high tensile strength and modulus.
Fibre Metal Laminate (FML) Structure/properties relationship
Fibre Metal Laminate known as Glare has a resin matrix affecting strength, stiffness, thermal expansion, and corrosion resistance. It also has fibre volume fraction which leads to increased stiffness, strength, and impact resistance. The Fibre-reinforced polymer composite contribute to enhanced, damage tolerance, impact resistance, corrosion resistance, and reduced weight compared to traditional metal structures.
