Document ID: chunk:federal_register_of_legislation:F2015C00542:reg:52:p4
Version: federal_register_of_legislation:F2015C00542
Segment Type: reg
Provision Reference: reg 52 (pt 4/6)
Character Range: 90203–93005

at least four hours immediately preceding the test.

Figure 3

Support for headform tests
       [9]

               Fix the test piece in the supporting frames (paragraph 3.1.3.); the torque on the bolts shall ensure that the movement of the test piece during the test will not exceed 2 mm. The plane of the test piece shall be substantially perpendicular to the incident direction of the weight. The weight shall strike the test piece within 40 mm of its geometric centre on that face which represents the inward face of the safety glazing when the latter is mounted on the vehicle, and shall be allowed to make only one impact.

               The impact surface of the felt cover shall be replaced after 12 tests.

              3.1.5.2. Tests on a complete windscreen (used only for a drop height of less than or equal to 1.5 m)

               Place the windscreen freely on a support with an interposed strip of rubber of hardness 70 IRHD and thickness about 3 mm, the width of contact over the whole perimeter being about 15 mm.

               The support shall consist of a rigid piece corresponding to the shape of the windscreen so that the headform weight strikes the internal surface. If necessary the windscreen shall be clamped to the support.

               The support shall rest on a rigid stand with an interposed sheet of rubber of hardness 70 IRHD and thickness about 3 mm. The surface of the windscreen shall be substantially perpendicular to the incident direction of the headform weight.

               The headform weight shall strike the windscreen at a point within 40 mm of its geometric centre on that face which represents the inward face of the safety glazing when the latter is mounted on the vehicle, and shall be allowed to make only one impact.

               The impact surface of the felt cover shall be replaced after 12 tests.

              3.2. Headform test with deceleration measurement

              3.2.1 Apparatus

               In the case of headform tests with simultaneous determination of HIC-values the drop body is the phantom head as in Figure 2.1. The total mass of the phantom head should be 10.0 + 0.2/ -0.0 kg.

               In the middle of the base plate (24) the triaxial mounting block (26) is mounted in the centre of gravity to receive the acceleration gauges (27). The acceleration gauges should be arranged vertically to each other.

               The basin (18) and cover (19) situated under the base plate (24) share, to a great extent, the elastic properties of the human skull. The elastic properties of the phantom head on impact are determined by the hardness and the thickness of the intermediate ring (13) and the basin.

Figure 2.1

10 kg Headform

       List of pieces for the 10 kg headform concerning