[The numerical simulation of the dynamic stress field from impacting head]

In order to study the mechanism of impact injury to the head, we have simulated the development of the stress field by using the numerical simulation method. The process of the head having been impacted vertically by an impactor can be described as a 2D problem, and the reactions of the head subjected to impacted force can be simulated and analyzed by the method based on the finite difference method (FDM). The model is subjected to applied force by an impactor with the initial velocity of 25 m/s (90 km/h). The pre-processing for the model is done on the microcomputer software. Once imported to the software, the nodes and elements are generated and material characteristics are assigned. The results demonstrate that the high resolution computer graphics can provide the dynamic distribution of the stress field, which can clearly show how the stress is developed, and how many its value is. The results are helpful to understanding the mechanism of impact injury to head.