Document ID: chunk:federal_register_of_legislation:F2012C00535:front:0:p29
Version: federal_register_of_legislation:F2012C00535
Segment Type: other
Provision Reference: 
Character Range: 79835–82689

requirements given in annex 6, paragraphs 3.1., 3.2., and 3.3., when designing and producing the body sections for test.

       2.2. The body sections shall be equipped with the residual space profile, at positions where it is considered that the pillars or other structural elements are likely to intrude as a result of the expected deformation.

       3. Test procedure

       3.1. Each body section to be tested shall be firmly and securely attached to the test bench through a rigid underframe structure in such a way that,

       3.1.1. local plastic deformation shall not occur around the attachment points;

       3.1.2. the location and method of attachment shall not inhibit the formation and working of expected plastic zones and hinges.

       3.2. For application of the load to the body section, the following rules shall be considered:

       3.2.1. the load  shall be evenly distributed on the cantrail, through a rigid beam, which is longer than the cantrail to simulate the ground in a rollover test, and which  follows the geometry of the cantrail.

       3.2.2. the direction of the applied load (see figure A7.1) shall be related to the longitudinal vertical centre plane of the vehicle and its inclination () shall be determined as follows:
            where:

            Hc  =  the cantrail height (in  mm) of the vehicle measured from the horizontal plane
                      on which it is standing.

    v)Figure A7.1 - Application of load to the body section

       3.2.3. the load shall be applied to the beam at the centre of gravity of the body section derived from the masses of its bays and the structural elements connecting them.  Using the symbols of Figure A.7.1, the position of the body section can be determined by the following formula:
            where:

            s  =    the number of the bays in the body section
             mi  =  the mass of the ith bay
           li    =  the distance of the centre of gravity of  the ith bay from a selected pivot point (the central plane of Bay(1) in figure A7.1)
            lCG  = the distance of the centre of gravity of the body section from the same selected pivot point.

       3.2.4. the load shall be increased gradually, taking measurements of the associated deformation at discrete intervals until the ultimate deformation (du ) when the residual space is invaded by one of the elements of the body section.

3.3. When plotting the load-deflection curve:

       3.3.1. the frequency of measurement shall be such as to produce  a continuous curve (see figure A.7.2).

3.3.2. the values of load and deformation shall be measured simultaneously.

       3.3.3. the deformation of the loaded cantrail shall be measured in the plane and direction of the applied load.

3.3.4. both load and deformation shall be measured to an accuracy of  1 per