發(fā)布時(shí)間：2019-01-12 16:45

【摘要】：目的針對(duì)目前對(duì)兒童顱腦組織材料參數(shù)的不確定性,研究直接沖擊載荷條件下顱腦組織材料參數(shù)對(duì)兒童頭部沖擊響應(yīng)的影響。方法應(yīng)用已驗(yàn)證的3歲兒童頭部有限元模型進(jìn)行沖擊仿真實(shí)驗(yàn),采用正交實(shí)驗(yàn)設(shè)計(jì)和方差分析對(duì)兒童顱腦組織材料進(jìn)行參數(shù)分析。結(jié)果顱骨彈性模量對(duì)兒童頭部沖擊響應(yīng)具有顯著性影響,隨著顱骨彈性模量的增加,頭部撞擊側(cè)顱內(nèi)壓力顯著減小(P=0.000),對(duì)撞側(cè)顱內(nèi)壓力顯著增大(P=0.000),顱骨最大Von Mises應(yīng)力顯著增大(P=0.000)。腦組織的線性黏彈性材料參數(shù)對(duì)兒童頭部沖擊響應(yīng)同樣具有顯著性影響,隨著腦組織短效剪切模量的增加,腦組織最大主應(yīng)變顯著減小(P=0.000),腦組織最大剪應(yīng)力則顯著增加(P=0.000)。結(jié)論參數(shù)分析結(jié)果可為今后兒童頭部有限元模型的材料選取提供參考依據(jù),進(jìn)而提升模型在預(yù)測(cè)臨床上無(wú)法通過腦CT影像確診的腦震蕩等腦損傷時(shí)的準(zhǔn)確性。
[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.
【作者單位】： 天津科技大學(xué)機(jī)械工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(81201015;81471274 81371360)
【分類號(hào)】：R318.08;R726.5

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