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KMID : 1144120160060020087
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Biomedical Engineering Letters
2016 Volume.6 No. 2 p.87 ~ p.93
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Effects of brain mechanical properties on child head responses under linear load
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Cui Shihai
Chen Yue
Li Haiyan
He Lijuan
Ruan Shijie
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Abstract
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Purpose: It is usually difficult to obtain the accurate mechanical properties of pediatric brain and skull because of the absence of pediatric cadaver experiments. The goal of this work is to discuss how different brain mechanical properties influence pediatric head response.
Methods: A validated finite element model of a 3-year-old child head with detailed anatomical structures was used to parametrically investigate the effects of mechanical properties on child head. Taguchi orthogonal method was adopted to decrease the numbers of the simulation under direct impact load.
Results: With the increase of the skull elastic modulus, the coup pressure decreases significantly (P < 0.001) whereas the contrecoup pressure (P < 0.001) and maximum von Mises stress of skull (P < 0.001) increase significantly. With the increase of the short-time shear modulus of brain tissue, maximum shear stress of brain tissue (P < 0.001) increases significantly whereas the maximum principal strain (P < 0.01) decreases significantly.
Conclusions: Both Elastic modulus of skull and linear viscoelastic material parameters of brain tissues have statistically significant effects on impact responses of child head. Different material parameters can lead to a great difference on impact responses of child head.
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KEYWORD
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Child head, Finite element model, Mechanical properties of brain tissues, Linear load, Head responses
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