Crash test

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NHTSA research crash test involving two Ford Five Hundreds.
Jeep Liberty undergoing routine impact testing at Chrysler's Proving Grounds
Full-scale crash test of various airbag technologies on an AH-1G (Mod) helicopter.

A crash test is a form of destructive testing usually performed in order to ensure safe design standards in crashworthiness and crash compatibility for various modes of transportation or related systems and components.

Types

  • Frontal-impact tests: which is what most people initially think of when asked about a crash test. These are usually impacts upon a solid concrete wall at a specified speed, but can also be vehicle-vehicle tests. SUVs have been singled out in these tests for a while, due to the high ride-height that they often have.
  • Moderate Overlap tests: in which only part of the front of the car impacts with a barrier (vehicle). These are important, as impact forces (approximately) remain the same as with a frontal impact test, but a smaller fraction of the car is required to absorb all of the force. These tests are often realized by cars turning into oncoming traffic. This type of testing is done by the U.S.A. Insurance Institute for Highway Safety (IIHS), EuroNCAP, Australasian New Car Assessment Program (ANCAP) and ASEAN NCAP.
  • Small Overlap tests: this is where only a small portion of the car's structure strikes an object such as a pole or a tree, or if a car were to clip another. This is the most demanding test as it loads the most force onto the cars structure at any given speed. These are usually conducted at 15-20% of the front vehicle structure.
  • Side-impact tests: these forms of accidents have a very significant likelihood of fatality, as cars do not have a significant crumple zone to absorb the impact forces before an occupant is injured.
  • Roll-over tests: which tests a car's ability (specifically the pillars holding the roof) to support itself in a dynamic impact. More recently dynamic rollover tests have been proposed as opposed to static crush testing (video).[1]
  • Roadside hardware crash tests: are used to ensure crash barriers and crash cushions will protect vehicle occupants from roadside hazards, and also to ensure that guard rails, sign posts, light poles and similar appurtenances do not pose an undue hazard to vehicle occupants.
  • Old versus new: Often an old and big car against a small and new car,[2][3] or two different generations of the same car model. These tests are performed to show the advancements in crashworthiness.[citation needed]
  • Computer model: Because of the cost of full-scale crash tests, engineers often run many simulated crash tests using computer models to refine their vehicle or barrier designs before conducting live tests.

Major providers

Data collection

Crash Test graphics
Crash test dummy left paraplegic after a severe oblique crash test inside a 1997 Geo Metro.

Crash tests are conducted under rigorous scientific and safety standards. Each crash test is very expensive so the maximum amount of data must be extracted from each test. Usually, this requires the use of high-speed data-acquisition, at least one triaxial accelerometer and a crash test dummy, but often includes more.

Some organizations that conduct crash tests include Monash University department of Civil Engineering, which routinely conducts crash tests for the purposes of roadside barrier safety and design.

Consumer response

  • In 1998 the Rover 100 received a one-star Adult Occupant Rating in EuroNCAP crash tests; sales promptly collapsed and the 18-year-old design was quickly scrapped.
  • In 2005 the Daewoo Kalos made news in Europe and Australia by scoring only two stars in its crash test, resulting in lower sales and highlighting the influence of vehicle crashworthiness on a model's success in the marketplace. The result for Holden in Australia, who retailed the Kalos under the Holden Barina name, resulted in a considerable amount of negative publicity, with the managing director of Holden forced to publicly defend the vehicle[4]
  • The second generation Isuzu Trooper (1995–1997) models were rated "Not Acceptable" by Consumer Reports for their tendency to roll over during testing. After the report Trooper sales never recovered and two years later production ceased.

Crash testing programs

There are a number of crash test programs around the world dedicated to providing consumers with a source of comparitative information in relation to the safety performance of new and used vehicles. Examples of new car crash test programs include National Highway Traffic Safety Administration's NCAP, the Insurance Institute for Highway Safety, Australasian New Car Assessment Program, EuroNCAP and JapNCAP. Programs such as the Used Car Safety Ratings provide consumers information on the safety performance of vehicles based on real world crash data.

See also

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found. Archived February 16, 2014 at the Wayback Machine
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

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