The Simulation And Analysis Of The Characteristic Of Deformation Of The Body-in-white;s Dynamic Crash And The Influence On Occupant Security Index

The actual legislated regulations about vehicles'front collisions can only estimate the occupant's injury index and the energy absorbing characteristic of the vehicles'front structure as a whole, but can not educe valuable conclusions on improvement design of each component of the frontal structures to satisfy the producer's requirements. So it is necessary to establish the interrelated parameters'model between occupant's response and the characteristic of deformation and energy absorbing of vehicle's front end. The study of the interrelated parameters'model of this kind is base on the research on the characteristic of deformation and energy absorbing of each component of the front structures. In the initial stage of this study, we can study the characteristic of deformation and energy absorbing of key component of the front structure. The front side rail is the key energy absorbing component of the vehicles'front structure. In this paper, the numerical crash simulation on the front side rail is made. Aimed at occupant security, the characteristic of deformation and energy absorbing of the front side rail is also discussed. At last, some measures about improvement on the characteristic of deformation and energy absorbing of the front side rail are obtained. (1) The internal and external status, research and developing methods, up to date achievements and developing trends of the automobile passive safety are introduced. The status and the shortage of the actual legislated regulations for full frontal collision are discussed. The internal and external research on full frontal collision and the shortage of the civil research are introduced. Combined with occupant security, the meaning of research on the front side rail is discussed. The development of crash simulation and the simulation software are also introduced. (2) The theory of the explicit nonlinear finite element which is largely adopted in the crash simulation software is introduced. (3) Based on occupant security, the optimized force-deformation curve of the front side rail is derived from the optimized curve of full vehicle. Combined with some energy absorbing assessment index, the evaluation methods about the characteristic of deformation and energy absorbing of the body-in-white are offered. (4) In order to obtain the parametric design experience of thin-walled beam, a model of thin-walled beam of the front side rail of HongQi CA7200 is set up. Combined with the energy absorbing assessment index, a series of...