开发和实验验证人类关节软骨的动态数值模型
Ben Mellors1, Piers Allen1, Carolina E Lavecchia2
1Physical Sciences for Health CDT, Department of Chemistry, University of Birmingham, Birmingham, UK.
概括
有限元素分析 (FEA) 模型是为了预测人类关节软骨 (AC) 动态机械行为而开发的. 第三阶的奥格登模型准确地预测了AC的初始压缩和动态振幅,优于其他模型.
科学领域:
- 生物力学 生物力学
- 生物材料科学 生物材料科学
- 计算力学 计算力学 计算力学
背景情况:
- 关节软骨 (AC) 的现有模型通常将负载条件简化为静态,实验验证有限.
- 在生理负荷下精确预测AC的动态机械行为对于了解关节健康和疾病至关重要.
研究的目的:
- 开发和实验验证有限元分析 (FEA) 模型,用于预测人类关节软骨 (AC) 的动态机械行为.
- 为了比较线性弹性,新霍肯和奥格登超弹性模型与实验数据的预测准确度.
主要方法:
- 构建了人类关节软骨的三个不同的FEA模型:线性弹性,新胡金式和第三阶段的奥格登高弹性.
- 使用人类大腿骨头压缩测试数据验证模型,包括近静态和动态机械分析 (DMA) 到1.7MPa.
主要成果:
- 线性弹性模型显著超预测了位移动态振幅 (10倍).
- 新胡克模型准确地预测了动态振幅,但高估了初始压缩 (10倍).
- 第三阶段的奥格登模型表现出最佳性能,初始压缩在1标准偏差内,动态振幅与实验数据相同.
结论:
- 第三阶段的Ogden超弹性模型在测试模型中提供了对人类关节软骨快速动态反应最准确的表示.
- 实验验证对于完善关节软骨等生物组织的FEA模型至关重要.
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