Document ID: chunk:federal_register_of_legislation:F2012C00535:front:0:p30
Version: federal_register_of_legislation:F2012C00535
Segment Type: other
Provision Reference: 
Character Range: 82442–85172

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 cent.

  4. Evaluation of test results

       4.1. From the plotted load-deformation curve the actual energy absorbed by the body section (EBS) shall be expressed as the area below the curve (see figure A.7.2).
Figure A7. 2  -   Absorbed energy for the body section, derived from the measured
load-deformation curve

       4.2. The minimum energy required to be absorbed by the body section (Emin) shall be determined as follows:

4.2.1. the total energy (ET) to be absorbed by the superstructure is:

ET = 0.75 M g h

where:

M  = Mk, unladen kerb mass of the vehicle if there are no occupant restraints; or,
       Mt, total effective vehicle mass when occupant restraints are fitted,
g    = gravitational constant,
          h  = the vertical movement (in metres) of the vehicle centre of gravity during a rollover
          test, as determined in appendix 1 to this annex.

       4.2.2. the total energy "ET" shall be distributed among the bays of the superstructure in the proportions of their masses:
where:
Ei  =  the absorbed energy by the "ith" bay
mI  =  mass of the "ith" bay, as determined in annex 4, paragraph 4.1

       4.2.3. the minimum energy required to be absorbed by the body section (Emin) is the sum of the energy of the bays comprising the body section:

       4.3. The body section passes the loading test, if:

           EBS   Emin

In this case, all the bays which form that body section are considered to have passed the quasi-static loading test and these results can be quoted in future requests for approval provided that the component bays are not expected to carry a greater mass in the subsequent superstructure.
4.4. The body section fails the loading test if:

            EBS   Emin
In this case all the bays which form that body section are considered to have failed the test even if the residual space is invaded in only one of the bays.
       4.5. The vehicle type shall be approved if all the required body sections pass the loading test.

   5. Documentation of body section quasi-static loading tests

   The test report shall follow the form and content of Annex 6, paragraph 6.

Annex 7 - Appendix 1

DETERMINATION OF THE VERTICAL MOVEMENT OF THE CENTRE OF GRAVITY DURING ROLLOVER

The vertical movement (h) of centre of gravity related to the rollover test may be determined by the graphical method shown below.

       1. Using scaled drawings of the cross-section of the vehicle, the initial height (h1) of the centre of