Enhanced vehicle light weighting and safety through tailored hot stamping

拟议的研究将解决基础材料表征和模型开发所需的引入定制热冲压工艺，以制造汽车碰撞吸能正面结构部件。由于热冲压工艺固有的超高强度（1500mpa），热冲压已被广泛用于制造侧面碰撞保护结构（b柱、侧梁、门梁）。目前的研究将考虑对热冲压部件进行定制，从而引入高强度（高达1,000 MPa）但延展性更大的局部柔软区域，从而使该工艺生产的部件能够在局部“定制”区域吸收碰撞能量。该研究将描述使用以下方法定制的部件的局部微观结构、性能和失效特征：(i)模内（IDH）加热以控制局部淬火速率和产生的性能；（ii）拼焊板（twb）。将开发这两类定制零件的碰撞行为的数值模型。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量身定制的热冲压制造的轻型版本。将测量该结构的碰撞响应，并根据实验评估/验证模型预测。

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.