| Wheel hub is one of the most important components and security composition of a car. Fatigue damage and fracture is not allowed throughout the life of the hub. Therefore, the hubs should undergo a series of test before being put to use.Firstly, the mechanical properties test and the fatigue test of the original plate are carried out, and then the hub fatigue finite element analysis is performed. In order to show the mechanical characteristics of DP600 dual-phase steel intuitively, the DP600 dual-phase steel JSH590 Y of Taiwan Steel and the ordinary low-alloy high strength steel SPFH590 of Posco are chosen to be test materials for tensile tests anisotropy experiments and the forming experiments of plate. The results show that dual-phase steel DP600 has features as follows: Low yield strength and yield strength ratio, well plastic deformation and bulging performance, satisfactory shape fixity; Because of high hardening exponent and strong uniform deformation, necking and local strain accumulation is less prone to happen to this kind of material; Small thick anisotropy coefficient r value resulting in the reducing wrinkling tendency of the middle part of the plate during the stamping process, on the other hand, it is helpful to improve stamping product quality. Therefore DP600 dual-phase steel is more suitable for making stamping hub. The fatigue experiments of DP600 duplex steel original sheet, and Lara fatigue tests of specimen in 15 rolling direction are carried out in this paper, finally, the experimental data are analyzed to give SN curve of DP600 dual-phase steel and calculate the fatigue limit.The three-dimensional geometry model and finite element model of the hub are established, respectively with CATIA and the finite element analysis software ANSYS. By setting appropriate boundary conditions with ANSYS, we calculated the stress contours and the stress centralized location. Then the static analysis results of the ANSYS is imported into FE-SAFE to calculate the wheel fatigue life and predict fatigue failure locations of the hub. On the basis of the finite element simulation of the steel hub, the fatigue test bench is carried out. The result show that the test results is in good agreement with the simulation results, this verify the feasibility of the finite element simulation. |
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