YASA
Donate
Yasa Conference in collaboration with Renault at Sagesse Ain El Remmeneh Yasa Conference for Civil Defense at Dbayeh Car Crash simulation at AUST university-Achrafieh Brasilia Declaration on Road Safety Yasa and Lassa Conference at the Evengelical Arminian school at Ashrafieh Yasa Conference at LIU rayak Yasa Conference at Balamand-Akkar Up to 27 seconds of inattention after using car's voice commands: studies Yasa Conference for the teachers at Dar Anout Driverless buses being tested in Greece New safety technology leaves some drivers confused Mother of 3 children killed in Vaughan crash Yasa Conference for the chorus of the Lady's rosary camp Ghadir Yasa & Renault Conference in Broummana- Saint Isaiah Monastery Yasa Conference in Akroum Mountain to Al Bayan association What's The Number One Reason People Die Early in Your Country? Americans less satisfied with cars than any time since 2004 Yasa Conference in Ibl El Saki in corporation with the Parish of Saint Georgios Fiat Chrysler recalls more than 85,000 Chrysler 200 sedans New technology will tell drivers when traffic lights change Conference at the association of the Bishop Hanna Tire Pressure and Loading Limits Variable Ride-Height Types of Car Seats Blind drivers go behind the wheel at Spanish racetrack THE NEW SYSTEM OF ROAD TRAFIC MANAGEMENT. Calls for Irish cars to have devices to prevent drink driving London clamps down on dangerous trucks Motorcycle safety the responsibility of riders and drivers Robot kills worker at Volkswagen plant in Germany Former ISU basketball player Jackson Vroman found dead at Calif. home Bus crash in Belgium kills one; UK students all survive Vehicle quality improves overall, but Japanese brands fall behind: J.D. Power Obama proposes tougher mileage standards for heavy-duty trucks The truth about Lebanon’s speed cameras Traffic safety Day at Saint Joseph School Traffic safety Day at Amjad deir Oubil Takata recalls nearly 34M air bags; largest auto recall in U.S. history China: Luxury cars wrecked in 'Fast and Furious' collision Passenger killed in Lamborghini crash at Disney racetrack 'driving experience' Qataris spend millions on 'fancy' licence plates Michael Schumacher Update & Latest News: F1 Racer May Not Return to Normal? DON’T DRINK AND DRIVE TAKE A TAXI TO SURVIVE Mercedes recalling 30,000 cars to fix rear tail lamp problem Canadian soldier, wife, 7-month-old baby killed in U.S. crash Crash car in Ferzoul Bekaa New P.E.I. licence plate in running for best in North America Why Sweden has so few road deaths 96 vehicles involved in collision after 'wall of snow' hits Highway 400 Doctors tell Michael Schumacher's family that 'only a miracle' can save him Man killed while trying to help roll-over victim on Highway 400 Police investigate fatal crash east of city Chris Kattan charged with DUI after freeway crash Busiest speed-on-green camera caught more than 28,000 drivers in 2013 Tests continue for drunk driver charged after allegedly entering liquor store Britain braced for NEW Atlantic storm think twice before you scare someone to DEATH Man hit by train in downtown core Two people dead in Brampton collision Parents of teen killed by drunk driver fight to prevent another tragedy Police hunt hit-and-run driver who left dog walker lying unconscious on the pavement ISF member killed after hitting stray donkey in Safra Japan chemical factory explosion (Mitsubishi) kills at least five Three killed, four injured in Alberta crash 3 Syrian nationals injured in car accident in Tripoli Firefighter finds his daughter dying in crash on Christmas Eve Genting Bus Crash: Worst Tragedy In 2013 Two women extricated from wreckage after car strikes CTrain New Brunswick town grieving loss of 4 teenagers killed in highway crash Unknown car hits and kills Syrian national in Halat RCMP investigate after teen hit in central Alberta Saturday morning snow wreaks havoc on Alberta’s highways Family struggles with loss after alleged impaired driving collision claims Edmonton man Man critically injured after being struck by TTC bus Bus crashes, catches fire in southern India; 45 passengers killed SUV veers into crowd at Beijing's Forbidden City; police say 5 killed, dozens hurt Official: 3 children die in Bronx fire after candle lit Woman in custody in connection to fatal hit and run Sean Edwards killed in Australian crash Police identify 2 Ontario boys killed while crossing street Two Ontario boys killed after being struck by vehicle Man dead after being struck by vehicle in North York. Mexican monster truck kills 8, hurts dozens when vehicle hits crowd. Launch of pilot project in Tunisia. America: Driver dead after car chase from White House to Capitol ends in police gunfire.
How Bicycle Helmets are Tested
10/6/2010 3:49:17 PM

How Bicycle Helmets are Tested


Summary: This page describes the lab tests that bike helmets must pass to meet the CPSC standard. There is other testing related to lead content that we do not cover. CPSC has a video of this testing up on their Web site.

The testing to certify a helmet to the US Consumer Product Safety Commission's standard for bicycle helmets can be described in six steps.

1. Samples required
The lab must procure samples of the helmet model. Full compliance testing requires 16 samples. The lab also needs a number from the manufacturer called the Helmet Positioning Index (HPI). It specifies the measurement to place the helmet correctly on the headform.

2. Marking
The lab technician puts the first sample on a test headform the right size to fit it. The headform is mounted upright on a stand, usually on a flat table. The helmet is adjusted using the HPI and then a 5 kilogram (10.x pound) cloth bag filled with lead shot is placed on it to compress any fitting foam inside. A marker on a stand is adjusted to the right level, using a measurement from a table in the standard that varies by helmet size. With the marker against the helmet the test line is marked by either rotating the helmet or sliding the marker stand around it. Each sample is marked in turn.
The lab test impacts must all be centered on or above the test line. The area below the line is not tested, although the "footprint" of an impact centered on the test line will extend below the line, and the helmet is not likely to pass if there is no material there. To get an idea of where the test line falls, you can take a medium sized helmet and mark the line xx mm below the top. Put that helmet on your head and you will see that the test line is probably higher than it should be, and the area of the helmet tested is really not large enough. The Snell Memorial Foundation's bicycle helmet standard has a lower test line. Even the old ANSI standard adopted in 1984 had a lower test line.

3. Conditioning
Helmets are tested hot, wet, cold and room temperature. Four samples are heated to Four samples are chilled to Four samples are soaked in water. Four samples are tested dry and room temperature.

4. Strap test
Next comes the strap strength and "rolloff" testing. Here is one test rig. There are other designs, but they all function the same. 
 

Photos from the CPSC test lab in Gaithersburg, MD

5. Drop tests
The helmet is now ready for drop testing. It is strapped onto a headform, held upside down on a test rig that guides its fall onto an anvil. This rig in the CPSC lab is a monorail, and the drop is guided by a single rail. Others use two parallel wires (twinwire).
 

 

The lab technician raises the helmet and headform up until the top of the helmet is a specified distance from the anvil below. A trigger lets the helmet drop in free fall until the helmet hits the anvil. The velocity of the drop is checked just before the impact to ensure that the speed was correct. An instrument called an accelerometer measures g's in the center of the headform. If the helmet works well, the g's are low--probably below 200, and in the better helmets below 150. If the g's exceed 300, the helmet fails. The testing is on three anvils of different shapes:
• The flat anvil is used with a 2 meter drop. The helmet and headform are traveling at 14 mph at impact.
• The hemispheric anvil shown below, about the shape of a grapefruit, is used with a 1.2 meter drop. (The point load makes it a severe test.) The helmet and headform are traveling 11 mph at impact.


 
• The hazard or curbstone anvil is rounded like the edge of a curb. It is another severe test, and the drop is 1.2 meters (11 mph).
If the drop speeds seem too low to you, please see our page on limits of helmet protection, where we explain them. We think they are adequate. If improvement can be made, lowering the g's permitted would reduce injuries more than raising the drop height, but you may need to review the phyisics of a fall to see why.

6. Records
The CPSC standard requires the lab to keep records of the testing. That includes data on the helmet and data on performance.
Pass or Fail
The bottom line is that the helmet must pass all of the tests described above. If it fails on any of them, it cannot be certified to the standard. You don't meet a standard "except for . . ." A failure on any element of the tests is a complete failure. 

 

Reference:
Bicycle Helmet Safety Institute
4611 Seventh Street South
Arlington, VA 22204-1419 USA

YASA

YASA Programs & Trainings

Simulation
Traffic Garden
Driver Improvment Program
First Aid
Books
traning program for the municipality police
Archive YASA
Safety Tips
Driving summer
Safety Promotion
Studying Environmental Impact of 'Quieter Cars'
Newsletters
Subscribe to Update
TAF
Victim Support
lfpc
Fire Safety
LASIP
Sport Safety
SBA
Building Safety
SRF
Agriculture Safety
Lassa
School Safety