The Optimal Design Of Vehicle Components Of The Tailor Blanks Structure

This thesis regarded a front bumper beam and a B pillar of a passenger car as research objects, and combined Tailor Welded Blanks(TWB) technology, Tailor Rolling Blanks (TRB) technology, and optimal Latin hypercube test, multi-objective discrete optimization method and genetic algorithm optimization method to optimize the above parts to meet their component performance and lightweight goals. To provide certain guiding significance for application of TWB and TRB on vehicle parts, this thesis obtained following research results:First, for Three Point Static Loading test, the TWB bumper beam optimized by discrete optimization method absorbed more energy than the previous beam with a constant thickness; its mass increase also got effective control. Besides, the TWB beam has a better deformation mode and better load characteristics. Therefore, the TWB beam meet the demands of component performance and lightweight. At the same time, it is verified that the multi-objective discrete optimization method can be applied for TWB components to avoid some disadvantages which traditional optimization method in the optimization of TWB.Second, TRB beam's energy absorption, deformation mode and load characteristics are not as improved well as TWB beam's under the condition that their mass are almost equal; on the other hand, the manufacturing cost of TWB beam is more expensive than the one of TRB beam. This thesis reached that researchers should the designer should balance the relationship between the performance improvement and cost control, to select the blank that can meet the design goal best.Finally, compared to constant thickness B pillar, TRB beam had less mass and lower intrusion and intrusion velocity. So TRB beam can reach the design requirements of lightweight, also give consideration to its crashworthiness. Taking the manufacturing process of TRB into consideration, this thesis fitted the optimized thickness distribution curve by several lines, which can be provides a convenient for manufacturing.Thus, it is concluded that TWB and TRB technology can improve the vehicles components'crashworthiness and lightweight performance; in actual production, designers should choose the most suitable blank for the vehicle component according to their advantages, disadvantages and other factors, such as their manufacturing costs.