ISO/TS 24667-2020 pdf free.Sports and recreational facilities — Impact surfacing testing device.
This document gives the specifications for impact attenuation testing equipment used to evaluate theimpact performance characteristics of playground surfacing. Its specifications are aimed at ensuringthat developers and manufacturers of such instruments meet minimum performance characteristics toallow repeatable, reproducible and accurate results.
This document does not specify a test method.
NOTE Such test methods are covered in other standards, e.g.EN 1177,ASTMF1292,ASTM F3313,AS4422,CSAZ614.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated references, the latest edition of the referenced document(including any amendments) applies.ISO 6487, Road vehicles — Measurement techniques in impact tests — Instrumentation.No terms and definitions are listed in this document.
The missile shall have the following specifications:
a) machined from solid billet of 6061-T6 or equivalent aluminium;
b)impacting surface of the missile to be spherical or hemispherical in shape with diameter of (160 ±1) mm;
c)final mass of missile assembly (including any moving part of a possible guiding system) to be (4,6±0,02) kg;
d) accelerometer (see 4.2) mounted at centre of mass( 5 mm in the vertical or horizontal axis);
e)no gaps or voids between the mounting face of the accelerometer and the impacting face of the missile;
f )for non-guided systems, a tri-axial accelerometer shall be used;
g) for guided systems:
1) The velocity of the missile immediately prior to impact is recorded in order to calculate the theoretical free fall drop height;
2) Velocity measurement systems as well as algorithms for calculating the fall height shall be calibrated for the whole velocity range (up to 3,5 m drop height);For free falling missiles, the calculated fall height shall be compared with the physicallymeasured effective fall height;
In all cases, the effective free height of fall shall be measured with an uncertainty of notmore than ±1 %;
3) A uniaxial accelerometer may be used which is aligned to measure in the vertical axis ±1° and located directly above the centre of mass.ISO/TS 24667 pdf download.