Study on Shock Absorb Properties of Protective Helmet

概要

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This report describes the shock absorbing properties of a helmet-head system. An equivalent analysis model of helmet is estimated from the mobility curves which are obtained by experiments. And the changes in the parameters of this model at temperature from -20℃ to +40℃ are measured. MSC(Maximum Strain Criterion) model is chosen to estimate the damage of the head by an impact. Hence the influence of impact to the helmet-head system, which is formed in these two models, is clarified by simulation. This report also refers to the influence of the helmet's 'peak' when the shock is added to it. The results are as follows: 1) The changes of protection efficiency with varying parameters of helmet model are obtained. 2) The relation between the shock absorbing efficiency of helmet and the impact duration is obtained. 3) The 'peak' has less influence on the head than the wearing condition of the helmet.
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