混合Ⅲ型50百分位假人头部有限元模型建模与对比研究

Modeling and Comparative Study of Finite Element Model for Hybrid Ⅲ 50^(th) Percentile Dummy Head

针对已公开的HybridⅢ第50百分位假人头部有限元模型过于简陋和网格尺寸过大的问题,建立了5种不同网格尺寸的HybridⅢ50百分位假人头部有限元模型。通过模型有效性验证发现,当网格尺寸大于10mm时由于沙漏能过大而导致模型仿真失效;等于4mm时模型接近于可能仿真失效;小到2mm时模型沙漏能得到了较好的控制且整个头部模型有很好的细节表现。具有该网格尺寸的头部模型较适用于头部接触碰撞的仿真,且可用来建立整体碰撞假人模型。在对头部皮肤与头盖骨之间接触特性的研究中发现,定义了头部皮肤与头盖骨之间的接触使仿真H IC值非常接近于试验值,消除了未定义接触时产生的约20%的误差。

In view of the defect of the exoteric finite element model for Hybrid Ⅲ 50th percentile dummy head（its mesh being too simple and coarse in size）,5 models for Hybrid Ⅲ 50th percentile dummy head are built with different grid size.It is found in model effectiveness verification that the simulation will be invalid due to too high a hourglass energy when the grid size is larger than 10mm,and it may be close to invalid when grid size is around 4mm.The hourglass energy can be well controlled and the whole head model has good pattern detail when the grid size is reduced to about 2mm.The head model with such a grid size is more suitable to be used in the crash simulation with head contact and can also be used for the modeling of entire crash dummy.It is also revealed in the study on contact features between head skin and head skull that the HIC value will be very close to test data when the contact between head skin and head skull is defined,eliminating 20% error generated in the case that contact is not defined.