AS 4422:2016 pdf free.Playground surfacing – Specifications, requirements and test method.
1.4.3 Drop height
The distance between the test position on the surfacing and the lowest point of the free falling missile prior to release.
1.4.4 Drop test (laboratory testing)
A minimum series of four impact measurements carried out from increasing fall heights,
such that at least one measurement gives an HIC value above 1000, or a gmax value above
200.
1.4.5 Free height of fall (Iir)
The greatest vertical distance from the clearly intended body support to the impact area below.
1.4.6 gmat
The multiple of the acceleration (g) into gravity at the earth’s surface at sea level that represents maximum acceleration experienced during impact.
1.4.7 [lead injury criteria (H1C)
A measure of impact severity that considers the duration over which the most critical
section of the deceleration pulse persists as well as the peak level of that deceleration.
1.4.8 HIC duration
The time interval over which the HIC is calculated, i.e. (r — 12).
NOTE: The ii — t are two intermediate values of i between ‘stall and ‘e,i attaining the maximum 1-1K’ value.
1.4.9 Impact-attenuating surfacing (lAS)
A surface, whereby the kinetic energy of an impact is dissipated by localized elastic hysteresis. deformation or displacement such that the maximum acceleration and HIC is reduced and the H1C duration is increased.
1.4.10 Impact attenuation
Property whereby the kinetic energy of an impact is dissipated by localized elastic hysteresis, deformation or displacement.
1.4.11 Impact nieasurement
The HIC value from the recorded acceleration of the missile falling from one fall height
onto one test position.
1.4.12 Loose-fill surface
Surfacing material supplied for the purpose of impact attenuation in playgrounds, consisting of unbound, granular, chipped or fibrous elements such as sand, wood-fibre, bark mulch, wood chips or other materials. These may be organic or inorganic.
1.4.13 Measured fall height (urn)
The height from which a single drop is conducted (being the hf with a minimum additional 10% allowance) to determine the HIC, gnax and HIC duration of the surface under test at a particular location. At the measured fall height the HIC and the g will be less than or equal to 1000. less than or equal to 200g, and greater than 3 ms respectively, for a satisfactory result.
1.4.14 Test position
A position on the material to be tested, located perpendicularly below the centre of the missile.AS 4422 pdf download.