Polymer based composites are widely used in the automobile body panels instead of the steel sheet, due to the requirement of reducing automobile weight. Natural fiber composites were proposed to be used for the car bumper beam. In this paper, the mold filling process of the car bumper beam model for VARTM process was simulated by the software of the RTM-worx. The optimization injection scheme was determined based on the simulation results of the different schemes. It was found that the multiple injection ports would reduce the filling times, and the scheme 6 was the best one for the injection. The filling times of the optimization scheme 6 was 742 s, and two vents at the position A and B would expel the bubbles at the intersectional regions of the resin. Moreover, the optimization scheme could be directly used in the practical production.
In view of the work conditions of eccentric loading in large forging presses, a set of synchronized deviation-rectifying system is necessary. Theoretical analysis and calculation of the synchronized balance force (rectified force) were computed based on static stress analysis theory, and then input into the commercial software MARC to build finite element model for combination frame structure of large forging press, the influence of synchronized force on the stiffness and stress distribution of combination frame structure (C type plates) were studied. Comparison among simulation results under different work conditions and also with experimental results was carried out, which testified the correctness of modeled rectified force equations and the finite element analysis system, and also showed the importance of the synchronization balanced system. The disquisitive work has certain significance for designing the large presses or other type presses with this type of combination structure.
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