Enhanced vehicle light weighting and safety through tailored hot stamping

这项拟议的研究将解决引入定制热冲压工艺制造汽车碰撞吸能正面结构部件所需的基本材料表征和模型开发。热冲压工艺因其固有的超高强度(1500兆帕)而被广泛应用于制造侧面碰撞防护结构(b柱、侧梁、门梁)。目前的研究将考虑定制热冲压部件，从而引入高强度(高达1,000兆帕)但延展性更好的局部较软区域，从而使这一工艺能够生产能够在局部“定制”区域吸收碰撞能量的部件。这项研究将表征使用以下方法定制的零件的局部组织、性能和性能的失效特征：(I)模内加热(IDH)以控制局部淬火速率和由此产生的性能；以及(Ii)量身定制焊接毛坯(TWB)。这两类定制零件的碰撞行为的数值模型将被开发出来。作为最后的验证，将开发一个演示结构，以捕获商业前端结构的正面碰撞响应。前轨组件将被替换为使用定制烫印制造的轻量化版本。将测量该结构的碰撞响应，并将根据实验对模型预测进行评估/验证。

The proposed research will address the fundamental material characterization and model development required to introduce tailored hot stamping processes to fabricate automotive crash energy-absorbing frontal structure components. Hot stamping has been adopted extensively to fabricate side impact protective structures (b-pillars, side sills, door beams) due to the inherent ultra-high strength (1,500 MPa) resulting from this process. The current research will consider tailoring of hot stamped components thereby introducing local softer regions of high strength (up to 1,000 MPa) but greater ductility, thereby enabling this process to produce components able to absorb crash energy in local "tailored" regions. The research will characterize the local microstructure, properties and failure characteristics of properties of parts tailored using: (i) in-die (IDH) heating to control local quench rates and resulting properties; and, (ii) tailor welded blanks (TWBs). Numerical models of the crash behaviour of these two classes of tailored parts will be developed. As a final validation, a demonstrator structure will be developed that captures the frontal crash response of a commercial front end structure. The front rail component will be replaced with a light weighted version fabricated using tailored hot stamping. The crash response of this structure will be measured and the model predictions will be assessed/validated against the experiments.