Experimental and numerical analysis of damage fracture mechanics of brain parenchyma
Experimental and numerical analysis of damage fracture mechanics of brain parenchyma
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DOI：
10.1109/robio.2016.7866369
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发表时间：
2016-12
期刊：
影响因子：
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通讯作者：
Xiaoshuai Chen;Kazuya Sase;A. Konno;T. Tsujita
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文献类型：
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作者：
Xiaoshuai Chen;Kazuya Sase;A. Konno;T. Tsujita
本文提出了一种用于触觉脑手术模拟的脑实质损伤与骨折模型。假设细观损伤从von Mises屈服准则开始，细观损伤的增长速率与体积应变成正比。采用猪脑实质进行了两种不同应变速率下的拉伸试验(拉伸速度分别为0.1 （mm/s）和1.0 （mm/s)，试样平均长度为15 (mm)）。利用0.1 （mm/s）速度下的实验数据拟合曲线求解优化问题，确定了力学性能和损伤模型参数。在拉伸速度为1.0 （mm/s）时，将仿真结果与实验数据进行对比，验证了所建立的模型和所识别的参数。采用传统的损伤模型简化Lemaitre模型进行比较。在拉伸速度为0.1 （mm/s）的条件下，采用本文提出的模型和简化Lemaitre模型进行拉伸仿真。仿真结果与实验结果进行了比较。结果表明，该模型能较好地再现脑实质的损伤和断裂力学，而简化Lemaitre模型不能很好地再现脑实质的延性。
In this paper, a damage and fracture model of brain parenchyma is proposed for a haptic brain surgery simulation. It is assumed that microscopic damage begins by von Mises yield criterion, and the microscopic damage grows rate in proportion to volume strain. Tensile tests with two different strain rate were conducted using porcine brain parenchyma (tensile velocities: 0.1 (mm/s) and 1.0 (mm/s), mean length of specimens: 15 (mm)). Mechanical properties and proposed damage model parameters were identified by solving optimization problem with fitted curves of experimental data at 0.1 (mm/s). The proposed model and identified parameters were verified by comparing the simulation result and experimental data with tensile velocity of 1.0 (mm/s). A conventional damage model, simplified Lemaitre model, was implemented for comparison. Tensile simulations were performed with two models, proposed model and simplified Lemaitre model, with tensile velocity of 0.1 (mm/s). The simulation results were compared with the experimental result. It is confirmed that the proposed model well reproduce damage and fracture mechanics of brain parenchyma, while the simplified Lemaitre model could not well reproduce the ductility.