REGULATION 12 SCHEDULE 1 (ii) High Temperature - the second is conditioned by exposing it to a temperature of 50°C +/-2°C and relative humidity condition of rh60% +/- 5% for a period of between 4 and 24 hours. All testing shall be conducted within 5 minutes of removal from the conditioning environment. 4.3 Impact Attenuation Testing 4.3.1 Principle The headgear is mounted on the test headform so that the headform can be oriented in different positions and dropped onto a flat impact surface. The acceleration and time history of the impact are recorded using a triaxial accelerometer and appropriate instrumentation. Peak acceleration and time duration data obtained using the methods specified in Section 4.3.4 are used to determine the impact characteristics of the headgear. 4.3.2 Apparatus The apparatus for the impact attenuation test shall consist of the following (also see Figure 4): Headforms – All headforms used will be to EN 960, be of metal and have a low resonance frequency (but not lower than 3kHz). Anvil – the anvil shall consist of a flat steel surface of diameter 130mm +/-3mm and not have a resonance frequency liable to affect measurements. The centre of mass of the drop head form shall lie over the centre of the anvil. Guide Assembly – a headform shall be attached to a free fall or rail guided drop assembly carriage by an adjustable mounting or other means that will allow impacts to be delivered at any prescribed point on the headgear. Accelerometer – a set of three accelerometers in a three axis array are mounted at or close to the centre of gravity of the test headform when the headform is mounted in the free fall carriage assembly. Impact Recording and Displaying Instrumentation – the impact shall be recorded and displayed on a storage oscilloscope with specified deflection factors, sweep speed per division and bandwidth for each of the accelerometers and be capable of resolving the gmax of the headform. Equivalent instrumentation capable of recording, displaying and storing the impact signal from the accelerometers shall meet this requirement. Last update: 14 January, 2015 199
World Rugby Handbook
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