Document ID: chunk:federal_register_of_legislation:F2012C00535:front:0:p43
Version: federal_register_of_legislation:F2012C00535
Segment Type: other
Provision Reference: 
Character Range: 118910–122013

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 the calculations shall simulate the behaviour of the structure when undergoing large plastic deformations.
9.1.3                                The test facility responsible for conducting the tests may be required to carry out test on joints or parts of the structure to verify the assumptions made in the calculation.
9.2                                      PREPARATIONS FOR CALCULATION
9.2.1                                Calculations cannot be started until the structure has been analysed and a mathematical model of it produced. This will define the separate members to be considered and identify the points at which plastic hinges may develop. The dimension of the members and the properties of materials used must be stated. Physical tests must be made on the hinge points to determine the force (moment of rotation) - deformation characteristics in the plastic mode as this is essential data for the calculations. The strain rate and the dynamic yield stress appropriate for this strain rate must be determined. If the calculation method will not indicate when a significant fracture will occur it will be essential to determine, by experiment separate analysis or appropriate dynamic tests that significant fractures will not occur. The assumed distribution of loading along the length of a vehicle shall be stated.
9.2.2                                The calculation method shall include the deformations up to the elastic limits of the materials followed by the identification of where plastic hinges will form and the subsequent formation of other plastic hinges unless the position and sequence of formation of plastic hinges is known from previous experience. The method shall accommodate the changes of geometry of the structure that take place, at least up to the stage where the deformations have passed the acceptable limits.
         Unless otherwise approved for the purposes of demonstration of compliance to this rule it is acceptable for the computer programme to exceed the measured force (moment of rotation) as determined by physical test by 10%.

9.2.3                                The calculations shall simulate the energy and the direction of impact which would occur if that particular superstructure were to be submitted to the roll-over tests prescribed in clause 6. The validity of the calculation method shall have been established by comparison with the results of physical tests, which need not necessarily have been made in connection with the vehicle now being approved.
9.3                                      When a calculation method is used for a section of a complete structure, the same conditions shall apply as stated above for the complete vehicle.

COMPILATION NOTES
This compilation of Vehicle Standard (Australian Design Rule 59/00 – Standards For