颅脑组织材料参数对儿童头部冲击响应的影响

发布时间：2019-01-12 16:45

【摘要】：目的针对目前对儿童颅脑组织材料参数的不确定性,研究直接冲击载荷条件下颅脑组织材料参数对儿童头部冲击响应的影响。方法应用已验证的3岁儿童头部有限元模型进行冲击仿真实验,采用正交实验设计和方差分析对儿童颅脑组织材料进行参数分析。结果颅骨弹性模量对儿童头部冲击响应具有显著性影响,随着颅骨弹性模量的增加,头部撞击侧颅内压力显著减小(P=0.000),对撞侧颅内压力显著增大(P=0.000),颅骨最大Von Mises应力显著增大(P=0.000)。脑组织的线性黏弹性材料参数对儿童头部冲击响应同样具有显著性影响,随着脑组织短效剪切模量的增加,脑组织最大主应变显著减小(P=0.000),脑组织最大剪应力则显著增加(P=0.000)。结论参数分析结果可为今后儿童头部有限元模型的材料选取提供参考依据,进而提升模型在预测临床上无法通过脑CT影像确诊的脑震荡等脑损伤时的准确性。
[Abstract]:Objective to study the effect of brain tissue material parameters on head shock response of children under direct impact loading. Methods the finite element model of the head of children aged 3 years was used to carry out the impact simulation experiment, and the orthogonal design and the analysis of variance were used to analyze the parameters of the brain tissue materials of the children. Results the elastic modulus of skull had a significant effect on the head impact response of children. With the increase of the elastic modulus of skull, the intracranial pressure of the head impingement side decreased significantly (P0. 000) and the intracranial pressure of the colliding side increased significantly (P0. 000). The maximum Von Mises stress of the skull was significantly increased (P0. 000). The linear viscoelastic material parameters of brain tissue also had significant influence on the head shock response of children. With the increase of the short-effect shear modulus of brain tissue, the maximum principal strain of brain tissue decreased significantly (P0. 000). The maximum shear stress of brain tissue increased significantly (P0. 000). Conclusion the results of parameter analysis can provide a reference for the material selection of the finite element model of the head of children in the future, and then improve the accuracy of the model in predicting brain injury such as concussion, which can not be diagnosed by CT imaging in clinic.
【作者单位】：天津科技大学机械工程学院;
【基金】：国家自然科学基金项目(81201015;81471274 81371360)
【分类号】：R318.08;R726.5

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