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在实质非线性μFE模拟中对简化骨螺丝接口模型进行比较

Pia Stefanek¹, Dieter H Pahr², Alexander Synek¹

¹Institute of Lightweight Design and Structural Biomechanics, TU Wien, Austria.

Journal of the mechanical behavior of biomedical materials

|June 30, 2024

概括

微有限元 (μFE) 模拟中的简化接口模型改善了骨螺丝 anchorage的预测. 张力压力元素删除 (TED) 和TED-M为复杂的接触模型提供了计算效率高的替代方案.

科学领域:

生物力学生物力学
计算建模计算建模
材料科学是一种材料科学.

背景情况:

微有限元 (μFE) 模拟对于评估骨螺丝 anchorage至关重要.
在微观尺度上准确地建模骨螺丝接口是具有挑战性的.
目前的黄金标准方法使用了计算密集的物理接触模型.

研究的目的:

在μFE模拟中,将简化接口模型的准确性和效率与黄金标准通用接触模型进行比较.
评估完全结合,张力紧张的元素删除 (TED) 和TED-M接口方法的预测能力.
评估这些模型对预测变形,刚性,最大力和损伤模式的影响.

主要方法:

非线性μFE模型是使用微CT图像创建的人类半径.
一个螺丝几乎被插入,模型受到张力,压缩和剪切负荷的影响.
三个简化的接口模型 (完全绑定,TED,TED-M) 与Abaqus Explicit中的通用联系 (黄金标准) 接口进行了比较.

主要成果:

完全结合的接口高估了度 (19%) 和最大力 (26%),损伤模式不准确.
无论是TED还是TED-M,都减少了刚性和力方面的错误,提高了损坏预测的准确性.
TED在整体结构度预测方面取得了卓越的成绩 (1%的误差),而TED-M在最大力预测方面取得了卓越的成绩 (1%的误差).

结论:

TED和TED-M为骨螺丝接口模拟提供了物理接触模型的计算效率高和准确的替代方案.
虽然对于某些应用程序,完全绑定的接口可能足够,但TED和TED-M提供了增强的预测能力.
这些简化模型可以显著降低计算成本,而不会在生物力学评估中显著失去准确性.

关键词:

骨螺丝接口建模模型骨螺丝系统骨螺丝系统实物非线性显式模拟微有限元素建模的微有限元素建模.

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