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A modified method for assigning material properties to FE models of bones.

机译:一种将材料属性分配给骨骼的有限元模型的改进方法。

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摘要

The aim of the present study is to compare the results from subject-specific finite element analysis (FEA) of a human femur to experimental measurements, using two different methods for assigning material properties to the FE models. A modified material mapping strategy allowing for spatial variation of material properties within the elements and Young's modulus surface corrections is presented and compared to a more conventional strategy, whereby constant material properties are assigned to each element. The accuracy of the superficial stress-strain predictions was evaluated against experimental results from 13 strain gauges and five different load cases. Both methods predicted stresses with acceptable accuracy (R(2) = 0.92, root mean square error, RMSE < 10%), with the conventional method performing slightly better. The modified method performed better in strain prediction (R(2) = 0.85, RMSE = 23% versus R(2) = 0.79, RMSE = 31%).
机译:本研究的目的是使用两种不同的方法将材料属性分配给有限元模型,比较人股骨的对象特定有限元分析(FEA)和实验测量结果。提出了一种改进的材料映射策略,该策略允许元素内材料特性的空间变化和杨氏模量表面校正,并将其与更常规的策略进行比较,从而为每个元素分配恒定的材料特性。根据13个应变仪和5个不同载荷工况的实验结果,评估了表面应力应变预测的准确性。两种方法都可以以可接受的精度预测应力(R(2)= 0.92,均方根误差,RMSE <10%),而传统方法的效果要好一些。改进的方法在应变预测中表现更好(R(2)= 0.85,RMSE = 23%,而R(2)= 0.79,RMSE = 31%)。

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