Research On Crashworthiness Performance And Selection Technology Of Advanced High Strength Steels Based On Side Impact

In recent years, energy shortage and environment pollution arising from rapiddevelopment of vehicle industry have been given more and more attention fromgovernment and citizen of all countries. In order to improve crash safety whilemaintain or decrease the vehicle mass, advanced high strength steels have beenincreasingly applied in automotive structures. At present, Crash performance andapplication techniques seems to be rarely reported. Therefore, the research oncrashworthiness and selection technology of advanced high strength steels has animportant practical significance for expending the use field of high strength steels andimproving materials selection technology.For solving above problems, this paper regards baosteel high strength steels asthe research object, and main research content include following two aspects:1) Research on the three point bending performance of advanced high strengthsteels. Firstly, B-pillar was simplified as thin-walled structure according to itsmechanical characters. Secondly, the anti-bending characters of different highstrength steels were studied by three point bending tests, which were carried out onthin-walled structures made from a variety of advanced high strength steels. Finally,lightweight low of advanced high strength steels and selection standard for key safetycomponents were summarized.2) Sensitivity analysis of auto-body key safety components in side impact.Based on the load path analysis and orthogonal experimental design, auto-body keysafety components associated with side crash were selected. Firstly, key componentsrelated to side impact safety are selected by analyzing the load path of side crash.Secondly, the matching law of high-strength steels of those components is studiedusing the orthogonal experimental design. Finally, key safety components, whichgreatly affect side crashworthiness, were selected out by orthogonal polar differenceanalysis. By this approach, the design space could be greatly reduced.3) Material selection technology for auto-body key safety components in sideimpact. Firstly, different response surface models of constraints and objectivefunctions were established based on uniform Latin square design experiment.Secondly, the way to establish response surface models with the highest accuracy byerror analysis. Finally, by combining approximate technology and multi-objective algorithm, an optimized material matching plan was given out, and as a result the sideimpact crashworthiness of the vehicle enhanced. The result shows that: the proposedoptimization procedure could not only improve the crashworthiness of side structure,but also realize the lightweight of vehicle, and this method has high accuracy andstrong practicality.