Vehicle Damage Analysis Flashcards

In a pedestrian collision, 'wrap projection' distance is most useful for estimating:

Answer: The vehicle's speed at impact based on the pedestrian's throw distance over the hood

Wrap projection uses the distance the pedestrian's body is carried forward on the hood and thrown to estimate impact speed, using established mathematical models.

Structural 'hinge buckling' of a vehicle's door during a side impact indicates that:

Answer: The door structure absorbed significant bending energy, suggesting a high-magnitude lateral force

Hinge buckling in a door occurs when the lateral force exceeds the door's bending resistance, indicating a substantial side-impact energy input.

The term 'delta-V' in collision analysis refers to:

Answer: The difference in vehicle speeds before and after the collision for a given vehicle

Delta-V is the change in velocity (magnitude and/or direction) experienced by a specific vehicle as a result of the collision event.

When two vehicles of significantly different masses collide, which vehicle will typically exhibit greater crush deformation, assuming similar stiffness?

Answer: The lighter vehicle, because it experiences a greater change in velocity (delta-V)

The lighter vehicle experiences a larger delta-V and therefore absorbs more energy structurally, resulting in greater crush deformation despite similar stiffness.

Paint transfer evidence between two vehicles in a collision is most useful for:

Answer: Confirming contact locations and sequencing the collision events

Paint transfer marks confirm physical contact locations on each vehicle and can help establish the sequence and geometry of collision events.

A vehicle that has sustained 'roof crush' in an upright (non-rollover) collision most likely experienced:

Answer: An impact with a tall rigid object such as a bridge abutment, median barrier, or overriding vehicle

Roof crush in an upright collision typically results from contact with a tall structure (overpass, barrier wall, or overriding large vehicle) that strikes at roof height.

Which principle explains why a vehicle's cabin (occupant compartment) is designed to remain intact while the front and rear crush zones deform in a collision?

Answer: The 'safety cell' or 'crumple zone' design philosophy, which sacrifices peripheral structure to protect occupants

Modern vehicles use controlled crumple zones fore and aft of a rigid safety cell so that crash energy is absorbed by structural deformation before reaching the occupant compartment.