Used for quasi static roof crush analysis.
Roof crush analysis.
Vehicle damage is mostly influenced by vertical velocity not roll rate or lateral velocity.
A safer car does not deform as much providing the occupant a larger survival space during this kind of accident.
The recently released nhtsa study roof crush analysis using 1997 2001 nass case review which has been in the works for nearly four years reviewed nass rollover crashes in an effort to determine whether roof deformation patterns identified in an earlier agency study were still valid for current vehicle designs see upgraded rollover roof crush protection.
Roof crush and roll velocity loss are however largely independent of lateral velocity.
The analysis procedure consisted of examining the case summary crash diagrams and photographic documentation to observe general roof damage patterns.
With the material and property cards assigned the free nodes and free masses as well as unattached springs and beams are removed from the model.
One of the tests used in occupant safety analysis is a roof crush test.
Objective of the test roof crush is the failure and displacement of an automobile roof into the passenger compartment during a rollover accident.
Fig 16 swr versus platen displacement for honda accord and lwv in iihs roof crash test.
Structural analysis solutions for body chassis powertrain and component applications capabilities applications linear nonlinear dynamics durability test correlation composites component strength roof crush nvh part fatigue.
The relationship between injury levels and intrusion or roof crush has been statistically established but the mechanism has been thought sometimes to be somewhat obscure.
Quasi static roof crush analysis was carried out on a car roof by a more or less rigid contact body with a flat surface with low velocity i e.
Roof crush simulation federal motor vehicle safety standard no.
Static and it was simulated in ls dyna shown in fig.
The roof strength is measured by the resistance force required to push a rigid plate into the roof structures.
A and b pillars tended to remain virtually straight.
Rollover test and nass case analysis nhtsa june 1992.
216 fmvss 216 first published in 1971 specified the test requirements and configurations of roof crush process.
It is used to evaluate how a car will deform during a rollover accident.
Material approach is preferred over the geometric approach due to space constraints in the passenger compartment as well as weight limitations.
