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Accident reconstruction experts are able to approximate speed from crush damage based on indirect comparisons with controlled testing. Agencies,
such as the National Highway Transportation Safety Administration (NHTSA) routinely perform crash testing under closely observed and
instrumented circumstances. These tests, while performed primarily for the purpose of evaluating safety, also provide accident reconstructionists
with stiffness coeficients.
Stiffness coefficients relate to the amount of energy necessary to permanently deform a given object. The stiffness coefficients from controlled
testing, along with the aforementioned crush measurements, allow experts to estimate the energy dissipated during a real life collision. Displaced
energy can then be related to impact speed.
such as the National Highway Transportation Safety Administration (NHTSA) routinely perform crash testing under closely observed and
instrumented circumstances. These tests, while performed primarily for the purpose of evaluating safety, also provide accident reconstructionists
with stiffness coeficients.
Stiffness coefficients relate to the amount of energy necessary to permanently deform a given object. The stiffness coefficients from controlled
testing, along with the aforementioned crush measurements, allow experts to estimate the energy dissipated during a real life collision. Displaced
energy can then be related to impact speed.
Many accident reconstruction methods rely upon the precise measurement and evaluation of vehicle damage. In the illustrations below, a damaged
vehicle (post-impact) and undamaged vehicle (exemplar) were measured and then compared to quantify the crush caused by a collision. Once the
crush on the deformed vehicle was quantified, an energy analysis was possible to determine the impact speed of the vehicle.
vehicle (post-impact) and undamaged vehicle (exemplar) were measured and then compared to quantify the crush caused by a collision. Once the
crush on the deformed vehicle was quantified, an energy analysis was possible to determine the impact speed of the vehicle.
| Undamaged Vehicle (Exemplar) |
| Damaged Vehicle (Post-Impact) |
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Disclaimer: Crash Data Services, LLC and crashdataservices.net provide the information in this web site for informational purposes only. The information is not intended to
be legal advice or an expert opinion and should not be construed as such. The use of this site does not create a contractor/client relationship with any employee of Crash
Data Services, LLC. Each investigation is different. Case results depend on a variety of factors unique to each case. The results of any investigation/reconstruction do not
guarantee or predict a similar result in any future case undertaken by Crash Data Services, LLC
be legal advice or an expert opinion and should not be construed as such. The use of this site does not create a contractor/client relationship with any employee of Crash
Data Services, LLC. Each investigation is different. Case results depend on a variety of factors unique to each case. The results of any investigation/reconstruction do not
guarantee or predict a similar result in any future case undertaken by Crash Data Services, LLC