在猪半径中使用高效的非线性μFE模型进行螺丝拉出力预测,包括接触和损伤前的模型
Pia Stefanek1, J D Silva-Henao1,2, Victoria Fiedler2
1Institute of Lightweight Design and Structural Biomechanics, TU Wien, Vienna, Austria.
Frontiers in bioengineering and biotechnology
|April 8, 2025
概括
计算效率高的非线性微有限元素 (μFE) 模型可以准确地预测骨螺丝拉出力. 整合简化的损坏前和接触力学对于定量准确性至关重要,大大改善了预测.
科学领域:
- 生物力学 生物力学
- 生物材料工程 生物材料工程
- 计算力学 计算力学 计算力学
背景情况:
- 非线性微有限元 (μFE) 模型对于模拟骨螺丝系统至关重要.
- 详细的μFE模型的计算需求限制了它们的尺寸和应用.
- 准确预测螺丝拉出力需要考虑材料的非线性,接触和损坏前.
研究的目的:
- 评估计算效率高,物质非线性μFE模型与实验性螺丝拉出数据的一致性.
- 评估简化接触接口和预损伤对拉出力预测的影响.
- 确定最佳的损坏前参数,以提高模型准确性.
主要方法:
- 在十个猪半径活检中实验测量了螺丝拉出力.
- 创建基于voxel的样本特定的μFE模型,模拟实验条件.
- 三种μFE模型类型的比较:完全结合 (FB),简化接触没有预损坏 (TED-M) 和简化接触与预损坏 (TED-M + P).
主要成果:
- 所有μFE模型都与实验数据有很高的相关性 (R2>0.85).
- 在FB和TED-M模型中,高估了拉出力 (MAPE> 52%).
- 具有优化损坏前参数的TED-M + P模型显著改善了预测 (MAPE <17%),尽管最佳参数含糊不清且依赖于材料.
结论:
- 计算效率高,物质非线性μFE模型与实验性螺丝拉出力有很强的相关性.
- 简化的损坏前和接触模型对于实现定量准确的预测至关重要.
- 精确整合接触建模,损伤前表示和骨材料特性对于可靠的μFE模拟至关重要.
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