Document ID: chunk:federal_register_of_legislation:F2019C00042:front:0:p29
Version: federal_register_of_legislation:F2019C00042
Segment Type: other
Provision Reference: 
Character Range: 79868–82719

test (7.3.) shows that the strap slips by less than half the prescribed value, in which case, the procedure 1 abrasion conditioning (7.4.1.6.4.1.) will not be necessary. The setting on the conditioning device will approximately maintain the relative position of strap and contact area.

         7.4.1.6.2. The samples shall be conditioned as described under paragraph 7.4.1.1. The ambient temperature during the abrasion procedure shall be between 15 and 30º C.

         7.4.1.6.3. In the table below are listed the general conditions for each abrasion procedure.

                Load    Frequency  Cycles   Shift
                daN     Hz         Numbers  mm
Procedure 1     2.5     0.5        5,000    300 ± 20
Procedure 2     0.5     0.5        45,000   300 ± 20
Procedure 3 */  0 to 5  0.5        45,000   -

*/ See paragraph 7.4.1.6.4.3.

          The shift given in the fifth column of this table represents the amplitude of a back and forth motion applied to the strap.

         7.4.1.6.4. Particular conditioning procedures

         7.4.1.6.4.1. Procedure 1: for cases where the strap slides through an adjusting device.

          A vertical steady load of 2.5 daN shall be maintained on one end of the strap ‑ the other end of the strap shall be attached to a device giving the strap a horizontal back and forth motion.

          The adjusting device shall be placed on the horizontal strap so that the strap remains under tension (see Annex 11, figure 1 to this Regulation).

         7.4.1.6.4.2. Procedure 2: for cases where the strap changes direction in passing through a rigid part.

          During this test, the angles of the straps shall be maintained as shown in Annex 11, figure 2, to this Regulation.

          The steady load of 0.5 daN shall be maintained during the test.

          For cases where the strap changes direction more than once in passing through a rigid part, the load of 0.5 daN may be increased so as to achieve the prescribed strap movement of 300 mm through that rigid part.

         7.4.1.6.4.3. Procedure 3: for cases where the strap is fixed to a rigid part by sewing or similar means.

          The total back and forth motion shall be 300 + 20 mm but the 5 daN load shall only be applied during a shift of 100 + 20 mm for each half period (see Annex 11, figure 3, to this Regulation).

         7.4.2. Test of breaking strength of strap (static test)

         7.4.2.1. The test shall be carried out each time on two new samples of strap, of sufficient length, conditioned in conformity with the provisions of paragraph 7.4.1.

         7.4.2.2. Each strap shall be gripped between the clamps of a tensile‑testing machine. The clamps shall be so designed as to avoid breakage of the strap at or near them. The speed of traverse shall be about 100 mm/min. The free length of