Structural Analysis & Damage Repair Flashcards

Diamond-shaped frame damage is characterized by:

Answer: One side of the frame shifted forward or back relative to the other

Diamond damage occurs when one frame side moves rearward or forward, forming a parallelogram shape.

Twist damage in a full frame is identified when:

Answer: One corner is higher and the diagonal corner is lower

Twist appears as one corner raised and its diagonal opposite lowered relative to a level reference.

A tram (tracking) gauge is primarily used to measure:

Answer: Point-to-point and diagonal dimensions

A tram gauge measures distances between specific points, including diagonals, to detect misalignment.

Mash (collapse) damage means the affected structural section is:

Answer: Shortened or crushed below its correct length

Mash damage describes a section that has been collapsed shorter than its factory dimension.

Why is a three-dimensional measuring system preferred for late-model unibody repair?

Answer: It measures length, width, and height simultaneously for accuracy

3D measuring systems capture X, Y, and Z dimensions for precise structural verification.

When a vehicle has sustained damage to a crush zone, the technician should know that crush zones are designed to:

Answer: Collapse in a controlled way to absorb energy

Crush (crumple) zones deform predictably to absorb crash energy and protect occupants.

Replacing a damaged crush zone with reinforced or non-OEM material is unacceptable because it:

Answer: Alters the designed energy-absorption behavior in a future crash

Improper material changes how the zone collapses, compromising occupant protection in future collisions.