Document ID: chunk:federal_register_of_legislation:F2012C00535:front:0:p42
Version: federal_register_of_legislation:F2012C00535
Segment Type: other
Provision Reference: 
Character Range: 116214–119207

not necessarily require more than one test.

8.4.2                                Calculations based on data obtained from a test on a body section may be used to demonstrate the acceptability of another body section which is not identical with the body section already tested if it has many structural features in common with it.
8.4.3                                The manufacturer shall declare which pillars of the superstructure are considered as contributing to its strength and shall also declare the amount of energy (Ei) that each pillar is intended to absorb. These declarations shall meet the following criteria:

         (1)          Where m is the total number of declared pillars

                        (2) (a)    Where n is the number of declared pillars forward of the centre of gravity  of the vehicle

                             (b)     Where p is the number of declared pillars to the rear of the centre of gravity of the vehicle

         (3) LF > 0.4 1f

         (4)  LR > 0.4 1r

                      (5)        This shall apply only where dmax is greater than 0.8 5 maximum deflection permitted without intrusion of the residual space.

               Where:

               Ei  is the declared amount of energy that can be absorbed by ith pillar of the superstructure.

               EiF is the declared amount of energy that can be absorbed by ith pillar forward of the centre of gravity of the vehicle.

               EiR is the declared amount of energy that can be absorbed by the ith pillar to the rear of the centre of gravity of the vehicle.

               E* is the total energy to be absorbed by the complete structure of the vehicle.

               dmax is the greatest amount of deflection measured in the direction of impact of any section of the body structure after it has absorbed its own declared impact energy.

               dmin is the least amount of deflection, measured in the direction of impact and at the same point on the bay as dmax, of any section of the body structure after it has absorbed its own declared impact energy.

               Where:

               1if  is the distance from the centre of gravity of the vehicle of the ith pillar forward of the centre of gravity.

               1ir is the distance from the centre of gravity of the vehicle of the ith pillar rearward of the centre of gravity.

               lf is the distance of the front of the vehicle from the centre of gravity of the vehicle.

               1r is the distance of the rear of the vehicle from the centre of gravity of the vehicle.

9.                                          VERIFICATION OF STRENGTH OF SUPERSTRUCTURE BY CALCULATION
9.1.1                                A superstructure or sections may be shown to meet the requirement specified in clause 2.1 by a calculation method.
9.1.2                                If the structure is likely to be subject to deformations beyond the elastic limit of the materials used then