The AZT test simulation is a classical example of dynamic calculation with large deformations. It is a validation test for the vehicle bumper components (cross-beam and crash - boxes). The AZT test is a low speed test where the energy absorbed by the bumper and the repairability (minimal costs) of the damage suffered in the different components are evaluated.
The targets to be achieved in the bumper design are force transmissions in a homogeneous way with the deformation taking place only in the crash-box and the crossbeam zones, so that it does not affect the rest of the vehicle structure.
AZT test consists of a mobile weighted trolley launched at 15 km/h against a rigid solid barrier relatively positioned to it with 40% offset. Each part should be modelled in the most suitable way ( the higher deformation the mesh suffers the smaller the elements should be and vice-versa)
Impactor trolley: Geometric and inertial properties equivalent to the real trolley have to be imposed on the model. As the trolley does not suffer any kind of deformation in the test, it is modelled as rigid body, so its internal forces are not calculated.
Barrier: It is also defined as rigid body.
Bumper: It is formed by the crossbeam and the crash - boxes. The element size of these components mesh should be smaller than in other parts of the model, since they are the most important zones of work in this test. It will be necessary to characterise the materials that form the different parts. Finally the definition of joints and contacts between the different parts will be done.