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Influence of the Material Definition on the Biomechanical Response of a Simplified Human Torso FE Model

机译:材料定义对简化人体躯干有限元模型的生物力学响应的影响

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The objective of the study was to investigate the influence of the (numerical) material definitions on the dynamic response of a heart and lungs in the human body model developed within the THOMO project (FP7, www.thomo.eu). The project interacts with a worldwide project called Global Human Body Models (www.ghbmc.com), which aim is to create and maintain the world's most biofidelic human body models. The calculations were performed with use of LS-Dyna solver. A series of simulations with different material configurations and with models of different complexity levels was performed. In the first loop of the simulations a simplified setup containing the basic organs has been tested. In the second loop the complete model has been used. All the material data and the experimental corridors for the validation were taken from the literature or delivered by the THOMO project partners. The results show that despite of the similar biomechanical response, some LS-Dyna material definitions are far less stable numerically. Additionally, choosing the optimal material for a heart or lungs separately does not mean that the combination of these two models (so changing them simultaneously) will fit best to the experimental corridors. The study has shown a very strong sensitivity of the results to the selected models. It confirms a necessity of correlation of the analysis results with the experimental data, if available.
机译:这项研究的目的是在THOMO项目(FP7,www.thomo.eu)开发的人体模型中研究(数字)材料定义对心脏和肺部动态响应的影响。该项目与一个名为“全球人体模型”(www.ghbmc.com)的全球项目互动,该项目旨在创建和维护世界上最生物的人体模型。使用LS-Dyna解算器进行计算。进行了一系列不同材料配置和不同复杂程度模型的仿真。在模拟的第一个循环中,已测试了包含基本器官的简化设置。在第二个循环中,使用了完整的模型。用于验证的所有材料数据和实验通道均取自文献或由THOMO项目合作伙伴提供。结果表明,尽管具有相似的生物力学响应,但某些LS-Dyna材料定义在数值上远不稳定。此外,分别为心脏或肺部选择最佳材料并不意味着这两种模型的组合(因此同时更改它们)将最适合实验走廊。研究表明,结果对所选模型非常敏感。如果有的话,它确定了将分析结果与实验数据进行关联的必要性。

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