人在摔倒时股骨上端承载能力的有限元分析——(I)有限元分析模型及股骨失效准则的建立

摔跤后,骨折已成为老年人最严重的损伤之一。有限元分析被证实在股骨的结构分析中是一项非常有用的工具。我们建立了股骨上端的有限元模型,并基于有关文献中关于股骨密质骨和松质骨的强度实验数据建立了Hoffm an失效准则。有限元模型和失效准则用前人的实验结果进行了验证。结果表明:预测的松质骨失效载荷仅比实验值低0.5%,而密质骨失效载荷仅比实验值高4.2%。这说明我们建立的有限元模型结合Hoffm an失效准则将很好地预测人摔倒时股骨的承载能力。

Finite Element Analysis (FEA) for the Structure Capacity of Proximal Femur During Falling——(I) FEA Model and the Failure Criteria for the Bone

Femur fracture from falls is considered one of the most serious types of the elderly.FEA has proved to be an extremely useful tool in the structure analysis of the proximal femur.In this paper,a FEA model of proximal femur is introduced,and Hoffman failure criteria are built based on the experimental strength data for both cortical bone and trabecular bone of the femur from some references.The FEA model and the failure criteria are verified using other researcher's experimental results.The predicted trabecular failure load was only 0.5% lower than the experimental data and cortical failure load was 4.2% higher than the experimental result.This result shows that our FEA model,combined with the Hoffman criterion for both cortical bone and trabecular bone,can effectively predict the structural capacity of the femur during falling.