The document discusses materials used in the automotive and defense industries. It notes that the most common materials in automobiles are steel, aluminum, magnesium, copper, plastics and carbon fiber. Over 70% of plastics used in cars come from four polymers: polyethylene terephthalate, high-density polyethylene, polyvinyl chloride, and low-density polyethylene. In defense, alloy steels are most commonly used as tank armor and ceramics are used in armor materials.

1. Materials Design
Dr.M.Suresh

2. Criteria in selecting materials
• Performance requirements.
• Reliability requirements.
• Size, shape, and mass requirements.

3. MATERIALS IN THE AUTOMOTIVE INDUSTRY

4. MATERIALS IN THE AUTOMOTIVE
INDUSTRY
• Making cars, parts and components, along
with future trends, are steel, aluminum,
magnesium, copper, plastics and carbon fiber.

5. Introduction
• In total, about 39 different types of basic
plastics and polymers are used to make an
automobile. More than 70% of the plastic
used in automobiles comes from four
polymers.

6. Basics On 7 Common Types of Plastic
1) Polyethylene Terephthalate (PET or PETE)
2) High-Density Polyethylene (HDPE)
3) Polyvinyl Chloride (PVC or Vinyl)
4) Low-Density Polyethylene (LDPE)
5) Polypropylene (PP)
6) Polystyrene (PS or Styrofoam)
7) Other.

7. • Identify the design requirements.
• Identify the materials selection criteria.
• Identify candidate materials.
• Evaluate candidate materials.
• Select materials.

8. • The most commonly used commercial
aerospace structural materials are aluminum
alloys, titanium alloys, high-strength steels,
and composites, generally accounting for
more than 90% of the weight of airframes.

9. Defence

10. • In defense industry, the use of ceramics is
mainly as an armour material. As tank
armour, alloy steels are the most commonly
used materials.