AS NZS 3629.11:2013 pdf free download – Methods of testing child restraints Method 11: Measuring energy attenuation

AS NZS 3629.11:2013 pdf free download – Methods of testing child restraints Method 11: Measuring energy attenuation.
NOTE: A material with the following composition has been found suitable— rnagnesium/iirconium binary alloy with 0,3% to 0.8% zirconium. d= 1.79 ±0.01 kg/drn1.
(b) An anvil consisting of a solid mass of at least 450 kg laced with a steel plate of at least 25 mm in thickness and having a lateral dimension of at least 500 mm x 500 mm.
(c) Release mechanism capable of smoothly releasing the drop assembly.
(d) A drop assembly complying with the following:
(i) It shall consist of a headform (size A) and a supporting assembly, the combined mass of which shall be 3.1 ±0.05 kg.
(ii) The mass of the supporting assembly, which comprises the supporting arm and ball socket stem, shall not exceed 20% of the mass of the drop assembly.
NOTE: It may be necessary to obtain the mass of thc ball sockct stem by calculation.
(iii) The centre of mass of the combined test headforrn and supporting assembly shall he within a cone with its axis vertical and Ibrming a 100 included angle with the vertex located at the point on the external surface of the test headform, which is vertically below the centre of the accelerometer. (See Figure I).
The combined centre of mass shall be determined for all points on the headform
above the test line.
NOTES:
I This is because, as the headlorm rotatcs, the combined centre of mass changes.
2 This may be accomplished mathematically once the centre of mass of the hcadform and support assembly has been determined.
(iv) An acceleration transducer shall be mounted at the centre of the ball socket. with the sensitive axis aligned to within 50 of the vertical when the test headform is in the impact position.
(v) The acceleration data channel shall comply with the requirements for Channel Class I000ofSAEJ2II.
(vi) A means to control the direction of the free fall.
(e) Means of securing the child restraint test specimen to hold it in position prior to. and whilst, the headlorm is impacting the specimen.
(f) Apparatus as specified in AS,NZS 3629.1 required for testing the child restraint in side impact.
Typical apparatus for impact energy attenuation test is shown in Figure 2.
(v) Position the specimen on the test anvil in a position where the back of the structure sits on the anvil and the headform aligns with the dummy’s head position identified in Step (a)(iv). Secure the sectioned child restraint so that it is stable preventing it from moving during the set-up and dropping of the headlbrm. Tape or EPS supports may be used to secure the sectioned test specimen in place, hut shall not interfere with the drop assembly. Figure 3 shows examples of positioning the test specimen on the test anvil and shows the alignment of the headform in order to contact the impact location determined in Step 8(a)(iv).
(vi) Raise the lowest part of the headform to a height of 1500 +30, —5 mm from the upper surface of the side of the specimen that the headform rested on in Step (a)(iv).
(vii) Drop the headform and ensure the strike is not affected by the back of the specimen.
(viii) Measure the headforrn acceleration at intervals specified in AS/NZS 1754.
(c) For child restraints incorporating more than one type designation, repeat Steps (a) and (b) for each type designation.
9 REPORT
The report shall include the following:
(a) Identity of the child restraint under test.
(b) Deadiorm acceleration.
(c) A reference to this test method, i.e. AS/NZS 3629.11.