Vehicle Construction and Parts Flashcards

What is the primary structural difference between aluminum-intensive vehicles and traditional steel unibody vehicles that affects repair procedures?

Answer: Aluminum work-hardens differently and cannot be straightened with heat the same way steel can, requiring dedicated tools and facilities

Aluminum's different metallurgical properties mean that heat straightening techniques used on steel are largely inappropriate, and cross-contamination with steel tools can cause galvanic corrosion.

What type of structural damage involves the rear section of the vehicle being pushed forward, causing the wheelbase to shorten?

Answer: Mash damage

Mash damage occurs when a collision force pushes the front or rear of a vehicle toward the center, shortening the wheelbase on the affected side or overall.

Which of the following best describes 'diamond' damage in vehicle body construction?

Answer: A condition where one side of the vehicle is pushed forward or rearward relative to the other side, making the body asymmetrical

Diamond damage occurs when one corner of the vehicle is pushed in an offset direction, causing the body to lose its rectangular shape and become parallelogram-shaped.

What component is typically found at the rear of a vehicle's frame rails to help distribute rear collision energy?

Answer: Rear crush cans or impact absorbers

Rear crush cans (also called shock absorbers or impact absorbers) are sacrificial energy-absorbing devices attached to the rear frame rails ahead of the bumper reinforcement bar.

In a vehicle equipped with a convertible or open-top body style, what structure compensates for the loss of the roof in maintaining chassis rigidity?

Answer: Underfloor X-bracing and reinforced sill sections

Convertibles use heavily reinforced floor structures, including cross-braces, X-members, and thicker rocker panels to compensate for the missing roof's contribution to torsional stiffness.

What is the purpose of 'pinch welds' in unibody vehicle construction, and why are they important during damage assessment?

Answer: They are the flanged weld seams at the bottom of rocker panels used for lift points and as indicators of structural integrity

Pinch welds are the double-flanged seams at the base of rocker panels; they serve as jack points and their condition reveals whether the floor and rocker structure have been damaged or previously repaired.

Which type of vehicle body construction technique uses a network of extruded aluminum tubes and cast nodes assembled like an erector set?

Answer: Space frame construction

Space frame construction uses a skeletal framework of structural members joined at nodes, over which body panels (often non-structural) are attached — used by manufacturers like Audi (ASF) and Lotus.