Automotive Design and Engineering Principles

Automotive Design Process

Creating a vehicle involves an attractive design process starting with sketches, dividing the vehicle into front and rear sections, and utilizing computer-aided design (CAD).

External Design Factors

• Aerodynamics: Drag coefficient and air friction.
• Ergonomics: Driver and passenger comfort.
• Specifications: Ground clearance, fuel tank capacity, wheel size, bumper dimensions, and engine type.

Measurement and Technical Conditions

Key considerations include visibility, mechanical features, ease of manufacturing, and safety standards.

Body Design and Software

Designers utilize Computer-Aided Design (CAD) and Computer-Aided Engineering (CAE). Common software includes Catia and other engineering programs.

Design Objectives

A successful design must be attractive, easy to manufacture, durable, use a minimum number of parts, incorporate recyclable materials, and maintain an optimal quality-to-price ratio.

Structural Calculation

The basic principle relies on the fact that deformations applied to a vehicle are proportional to the stresses applied.

Finite Element Analysis (FEA)

• Advantages: Determine vehicle variables and calculate dimensions for sheet metal and composite materials.
• Disadvantages: Accuracy depends on element types, variations between calculated and real sheet metal, and the complexity of welded joints.

Materials in Automotive Engineering

Components made with high-strength steel include stringers, floor reinforcements, rear chassis reinforcements, side chassis reinforcements, rear cross-members, hinges, and reinforced doors.

ULSAB Technology

The Ultra Light Steel Auto Body (ULSAB), developed by Porsche, offers 25% less weight and 80% higher impact resistance.

Non-Ferrous Materials

According to DIN 17600, non-ferrous materials include all metals except unalloyed iron.

• Copper: Density 8.9, Melting Point 1080°C. Soft, malleable, and highly conductive. Forms a green protective patina. Used for electrical conduction and cooling pipes.
• Zinc: Density 7.1, Melting Point 420°C. High thermal expansion; used as a protective coating for steel.
• Tin: Density 7.2, Melting Point 230°C. Corrosion-resistant and soft; used to protect steel plates.
• Lead: Density 11.3, Melting Point 320°C. Soft and resistant to sulfuric and hydrochloric acids.
• Nickel: Density 8.8, Melting Point 1450°C. Tough, silver-white, and corrosion-resistant. Used in starters and as a protective coating.
• Titanium: Density 4.51, Melting Point 1670°C. High mechanical resistance and corrosion resistance; lightweight compared to aluminum.