Apart from AZT tests, a second performance required from bumper systems is based on pedestrian accidents. In this context, the the bumper has to be as little aggressive as possible. Based on this, a whole testing methodology has been defined in order to verify the behaviour of the front part of vehicles. These tests consist of the launching of several impactors representing different parts of the human body against the vehicle (pedestrian tests).
One of the pedestrian tests is known as lower legform. With this test the front vehicle aggressiveness with a pedestrian leg is evaluated. The lower legform impactor represents the human femur-knee-tibia assembly, and test conditions imply to impact this device (with a total mass of 13.4 Kg.) launched at 40 Km/h against the bumper of the vehicle.
Specifications from EEVC for lower leg pedestrian protection are defined based on biomechanical criteria as follows:
Knee shear displacement (< 6 mm)
Knee bending angle (< 15º)
Tibia acceleration (< 150 g)