ISO 8718 pdf download

ISO 8718 pdf download.Road vehicles — Drawbar couplings and eyes for hinged drawbars — Strength tests 1 Scope This International Standard specifies strength test conditions and requirements for the 40 mm and 50 mm drawbar couplings and corresponding drawbar eyes for hinged drawbars. NOTE See ISO 3584 [1] for couplings, and ISO 1102 [2] and ISO 8755 [3] for eyes. 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 1176, Road vehicles — Masses — Vocabulary and codes 3 Terms and definitions For the purposes of this International Standard, the terms and definitions given in ISO 1176 apply. 4 General test requirements 4.1 The test shall be carried out with drawbar couplings and drawbar eyes having corresponding functional dimensions. 4.2 The strength tests specified in this International Standard are static and dynamic tests that shall be performed on a test bed. 4.3 The fixing arrangements for the drawbar coupling and the drawbar eye on the test bed shall be the same as those for their attachment to the vehicle, and shall be in accordance with the drawbar manufacturer’s fitting instructions.4.4 Drawbar couplings and drawbar eyes may be tested separately or together. 4.5 Couplings should preferably be tested in the original condition as designed for road use. At the discretion of the manufacturer and in agreement with the test laboratory, flexible components may be neutralized if this is necessary for the test procedure and if there is no concern about unrealistic influence on the test result. 4.6 Flexible components that appear to be overstressed due to this accelerated test procedure may be replaced during the dynamic test. 6 Dynamic test 6.1 Application of test load 6.1.1 Apply the horizontal test load, F t , simulating practical loads under driving conditions. 6.1.2 F t shall be an alternating force applied in the location and direction shown in Figure 1. F t shall be applied by means of a special slack-free trailer...