05 Crash worthiness - compatibility - Infrastructure design

Question 1

crashworthiness

Answer 1

ability of a structure to protect its occupants
=> safety capsule needs to stay intact

Question 2

Structure elements

Answer 2

Crash box:
Upper Longitudinal
Main Longitudinal
Lateral connection (Bumper cross beam)
shot gun (for partial frontal)

passenger compartment:
A Pillar
Fire wall
Sill or Rocker Panel
Door

Question 3

Load paths (graph)

Answer 3

Phase 1: Space between bumper and engine
form 0 to first plateau
Phase 2: engine and drivetrain start moving
increase to second plateau
Rebound
steep decrease after plateau

Question 4

Load paths offset crash

Answer 4

55% Upper Longitudinal
30% Main Longitudinal
30% shot gun (for partial frontal)

20% A pillar
<4% door
46% sill
30% underbody

Question 5

Tradeoff Compatibility

Answer 5

Compatibility <-> aggressively
self protection <-> protection at expense of others

Question 6

Compatibility Categries

Answer 6

Mass
Stiffness (best would be same stiffness) F=ma = -kx
Structural interaction (manly hight)

Question 7

Side impact structure

Answer 7

Roof rail
Roof cross member (lateral reinforcement)
B pillar
Side sill
floor cross member (lateral reinforcement)
A pillar + Fire wall

Question 8

side vs. front crash distance

Answer 8

side:
150mm head to door
150mm door
front:
650mm crashbox
350mm head to steering wheel

Question 9

rear impact

Answer 9

not as important anymore
manly protection of fuel system

Question 10

FARS

Answer 10

Fatality Analysis Reporting System

Question 11

Infrastructure design (FARS) first harmful events

Answer 11

Tree ~2200
Pole ~570
Park car ~300

Question 12

Barriers type

Answer 12

Box Beam (like US)
W-Beam (like DE)
Cable (like SE)

Question 13

Delta V

Answer 13

delta V= Vpost - Vpre