摘要
本文提出了一个由双层线性粘弹性固体球壳充以线性粘弹性流体所形成的人头颅力学模型,考虑了头颅的外皮层在受撞击时的作用。用粘弹性动力学对应原理,导出了波的传播方程。分析结果表明:1.脑区最大正压位于撞击点,而最大负压出现在对侧点;2.分析结果证实了脑在撞击荷载作用下的空化损伤理论;3.皮层对于提高头颅的刚度、衰减冲击能量、缓解撞击引起的脑损伤具有重要作用。
<ABSTRACT>
A mechanical model of a linear viscoelastic double-layered shell
filled with linear viscoelastic fluid is introduced for mechanical anal-
ysis of human skull under impact. The outerlayer of the model simulates
the skin of a skull. A wave-propagating equation is introduced based on
correspondence principle of viscoelastic dynamics. The results show:
1. The maximum positive pressure occurs in the site of impact, while the
maximum negative pressure appears in the reflex area of the wave ; 2. The res
ults verify the cavity-injury theory of brain under impact; 3. The skin of a
skull is important fot relaxing the injure of brain by impact since it cau
raise the stiffness of a skull and resorb the energy of impact.
Keywords: Skull; impact; viscoelastic dynamics; correspondence principle; neg-
ative pressure; injurye of brain
出处
《中国生物医学工程学报》
EI
CAS
CSCD
北大核心
1992年第3期141-149,共9页
Chinese Journal of Biomedical Engineering
