Abstract
A concept for varying the crush force and energy absorption of passenger vehicle longitudinal members in a frontal crash was developed and tested. Two types of prototype longitudinal members were evaluated. One type was a smooth hollow tube and the other was a variable diameter tube. The crush force was varied by means of pressurizing the tubes. The evaluation was carried out by mounting the longitudinal members connected by a bumper beam on a moving barrier. The moving barrier was impacting a 50% offset rigid barrier at various impact velocities. The impact velocities were varied from 15 to 39 km/h and the pressure in the members was varied from 0 MPa to 6 MPa. Barrier acceleration, crush force and member pressure were measured. By pressurizing the smooth tube the energy absorption was increased from 10 kJ for the unpressurized tube to 16 kJ for the pressurized tube at 80 mm deformation. For the variable diameter tube the energy absorbed was increased from 10 kJ for the unpressurized tube to 17 kJ for the pressurized tube at 200 mm deformation.
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