Technical Bulletin

Headform toBonnet Leading Edge Tests
Version 1.0
June 2014
TB 019TitleVersionDocument Number
AuthorDate
Related Documents
StatusApplication Date

Headform to bonnet leading edge tests
1.0
TB 019Oliver Zander (BASt), M. van Ratingen
June 2014
Euro NCAP Pedestrian Testing Protocol
Monitoring
January 2015

2Contents
1. Background.................................................................................................... 4
2. Motivation ...................................................................................................... 5
3. Procedure ....................................................................................................... 6
4. References ...................................................................................................... 73

1. Background
With Euro NCAP Pedestrian Testing Protocol Version 8.0, a revised test with the upper
legform impactor will be introduced. While the bonnet leading edge has previously beentested and assessed by default as a potentially injury causing part, the revised procedure isadopting Euro NCAP’s philosophy of testing and assessing the injury risk for definedpedestrian’s body regions, namely for the (adult) pelvis and the thigh in vehicle to pedestriancrashes.

Upper legform to bonnet leading edge test

Revised upper legform test. (Upper legform to WAD 775 mm test)

In-depth accident data has revealed that, although not for a significant number of (adult)
pelvis injuries, the bonnet leading edge is responsible for a high portion of severe injuries ofother vulnerable road user body regions, for instance for persons of smaller stature.
While in most cases the protection potential of the leading edge will be covered by the revised
upper legform test, rare cases will still occur where the bonnet leading edge reference line isprecisely located in the area between the wrap around distances 1000 mm (forward limitationof the child headform test zone) and 930 mm (location of the upper load cell of the upper
legform impactor, the upper limitation of the new upper leg test), an area which by definitionis untested (Note: according to the new procedure, regardless the vehicle front geometry, atleast the area between WAD 1000 mm and WAD 930 mm at vehicle longitudinal centerline
will not be tested anymore. Due to the GRID definition, this untested area is getting larger
moving laterally along the vehicle in outboard direction):

BLE located between WAD 1000 and WAD 930  no test4

Examples of vehicles where the BLE located between WAD 1000 and WAD 930

2. Motivation
The area between WAD 1000 mm and WAD 930 mm is assumed to be uncritical when nohard structures / injury causing vehicle components are located under the surface.

However, if hard structures are located in this untested area (as it can be assumed for thebonnet leading edge and its periphery) the area should be regarded being critical in terms ofVRU protection.
The headform to bonnet leading edge test, defined in the Technical Bulletin, is meant toassess the injury risk of the bonnet leading edge during a vehicle impact against a vulnerable
road user in case of not being considered within the revised upper legform test. The headformto bonnet leading edge test is to be carried out in all cases where the bonnet leading edge
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reference line is located between WAD 1000 mm and WAD 930 mm and thus not being
tested by means of the revised upper legform test.

3. Procedure
Headform monitoring tests to the bonnet leading edge reference line
For the vertical longitudinal plane of any upper legform grid point determined in paragraph3.11 of the pedestrian testing protocol where the bonnet leading edge reference line is locatedbetween WAD 930 mm and WAD 1000 mm, an additional test with the child headform
impactor will be performed at the intersection of the vertical longitudinal plane with thebonnet leading edge reference line at an impact speed of 40 km/h under an impact angle of
20° ±2° to the Ground Reference Level.
The result of this test will be monitored against a HIC value of 650. Where a 'poor' test result
has been achieved, Euro NCAP may choose to comment on this alongside the normalpedestrian protection score. The results of these tests will NOT be reflected in the pedestrian
protection score or any other part of the overall assessment.

64. References
Matsui Y, Ishikawa H, Sasaki A: “Validation of pedestrian upper legform impact test –reconstruction of pedestrian accidents.” Paper No. 98-S lo-O-05 of 16th ESV Conference,Ontario, Canada. 1998..
Liers H, Hannawald L, Brehme H: “Scope extension of pedestrian legislation to vehivles
above 2.500 kg groiss vehivle weight.” Verkehrsunfallforschung an der Technischen
Universität Dresden GmbH. 2007.
Fredrikkson R, Flink E, Boström O, Backman K: ”Injury mitigation in SUV-to-pedestrian
impacts“. Paper No. 07-0380 of 20th ESV Conference, Lyon, France. 2007.

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