猪下颌骨枪弹伤的三维有限元仿真模拟

目的 建立猪下颌骨三维有限元模型,动态模拟子弹侵彻下颌骨过程,探讨颌面部枪弹伤有限元分析方法.方法 将CT所获得的本地猪下颌骨医学数字图像通讯(digital imagins and communications in medicine,DICOM)数据通过MIMICS软件进行三维重建,然后利用ANSA软件划分网格建立猪下颌骨三维有限元模型,并在LS-DYNA软件中仿真7.62 mm制式弹致伤过程,仿真结果与实体动物实验数据对比,验证三维有限元模型和仿真方法的可行性.结果 建立了几何外形高度相似的猪下颌骨枪弹伤三维有限元模型,成功仿真了7.62 mm制式子弹枪弹伤动态损伤过程,部分仿真数据与动物实验数据有较高一致性.结论 有限元法在颌面部火器伤基础研究中有较好的推广应用价值.

Three-dimensional finite element simulation of mandible gunshot wound in swine

Objective To establish a three-dimensional (3D) finite element model of a swine mandible, simulate the dynamic procedure of bullet damaging the swine mandible and explore a finite ele-ment analysis method on maxiilofacial gunshot wound. Methods The digital imaging and communica-tions in medicine (DICOM) data obtained from CT scanning of a swine mandible were remerged into a 3D finite element model of the original specimen through Mimics and ANSA software, then a simulation of 3D finite element model penetrated by a 7.62 mm bullet was carried out through LS-DYNA software. The simulation data were compared with those from animal experiment in laboratory to test the feasibility of 3D finite element model and the simulation method. Results A 3D finite element model of a swine mandi-ble was established, with highly identical geometric size with the specimen. In the meantime, the dynam-ic process of a 7.62 mm bullet damage to the model was successfully simulated. Data from the simulation and those from animal experiment showed a high level of consistency. Conclusion 3D finite element method is prosperous in application in basic research on maxillofacial gunshot wound.