用基于图像的惯性冲击 (IBII) 测试分析皮质骨的高应变率行为
L Fletcher1, F Pierron1,2
1Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK.
概括
这项研究引入了基于图像的惯性冲击 (IBII) 测试,以测量皮层骨的高延展率特性. IBII测试提供了关键的数据骨硬度和拉伸强度在快速负载下,对于理解创伤性骨折至关重要.
科学领域:
- 生物力学 生物力学
- 材料科学 材料科学 材料科学
- 整形外科 整形外科 整形外科
背景情况:
- 创伤性骨折通常是由高应变率负荷引起的.
- 对于皮层骨,特别是紧张时,存在有限的高张力率数据.
- 现有的分裂-霍普金森棒 (SHB) 方法对像骨头这样的准脆性材料的拉力测试具有挑战性.
研究的目的:
- 应用基于图像的惯性冲击 (IBII) 试验,以获得皮层骨的新型高应变率数据.
- 为了确定皮层骨在高拉伸率下的正极硬度组件和拉伸失效应力.
- 为了研究皮层骨的机械性质的速率灵敏度.
主要方法:
- 使用基于图像的惯性冲击 (IBII) 测试进行高拉伸率材料分析.
- 测试的牛皮层骨样本与长轴平行 (纵向) 和垂直 (横向).
- 获得了关于弹性刚度,拉力失效应力和剪切模块的数据.
主要成果:
- 平均纵向硬度:在1150s-1时26 GPa;横向硬度:在1300s-1时15.2 GPa.
- 纵向样本显示22%的速率灵敏度;横向样本显示5.5%的速率灵敏度.
- 平均拉伸失效应力:146MPa (纵向) 和53.6MPa (横向) 在5200s-1.1时.
- 平均切割模块:在1200s-1.1时为6.9GPa.
结论:
- IBII测试成功生成了皮层骨的高应变率正方形机械数据.
- 皮层骨在其刚性和故障特性中表现出显著的速率灵敏度.
- 这项研究为生物力学建模和理解动态负荷下骨折机制提供了有价值的数据.
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