SCHEDULE 1 REGULATION 12 6.3 Impact Attenuation Testing 6.3.1 Principle The shoulder pad is mounted on a cylindrical test anvil. A mass with flat striking surface is dropped onto it. The peak acceleration and time history of the impact are recorded using an accelerometer and appropriate instrumentation. Peak acceleration and time duration data obtained using the methods specified in Section 6.3.4 are used to determine the impact characteristics of the shoulder pads. 6.3.2 Apparatus The apparatus for the impact attenuation test shall consist of the following (also see Figure 9): Drop Assembly - a dropping mass shall be attached to a free fall or rail guided drop assembly carriage. The mass shall be 5 kg +/- 0.02 kg. The dropping mass shall have a flat striking face of diameter 130mm +/- 2mm. Anvil- the anvil shall consist of a horizontal steel cylinder with a diameter of 115mm +/- 2mm and shall not have a resonance frequency liable to affect measurements. The centre of mass of the drop mass shall lie over the centre of the anvil. Accelerometer - an accelerometer is mounted at or close to the centre of gravity of the drop mass. Impact Recording and Displaying Instrumentation - the impact shall be recorded and displayed on a storage oscilloscope with specified deflection factor, sweep speed per division and bandwidth for the accelerometer and be capable of resolving the gmax of the drop weight. Equivalent instrumentation capable of recording, displaying and storing the impact signal from the accelerometer shall meet this requirement 6.3.3 Reference Testing An MEP (modular elastomer programmer) reference surface with a convex face will be used, measuring 150mm diameter, 25mm thick at the centre and mounted on a matching steel base. The drop weight will be dropped onto the MEP impact surface from a distance 300 +/- 5mm. Resolved gmax values recorded by the accelerometer on three successive drops shall lie within +/- 10g of the mean. 6.3.4 Impacting Each shoulder pad is impacted at two locations providing the size of padding allows a distance of not less than 3cm apart and at least 2 cm from the periphery of the padding. Where size of shoulder pad does not allow this than a single location for each padding is permitted. It is important that the maximum length of impact area is equivalent to the diameter of the drop weight striking surface. The impacting energy will be 14.7J (which is equivalent to a 5 kg drop weight falling through 300mm) Last update: 14 January, 2015 208
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