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首页> 外文期刊>Journal of Biomechanics >Proximal femur elastic behaviour is the same in impact and constant displacement rate fall simulation
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Proximal femur elastic behaviour is the same in impact and constant displacement rate fall simulation

机译：近端股骨弹性行为在碰撞和恒定的位移率下降模拟中是相同的

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Understanding proximal femur fracture may yield new targets for fracture prevention screening and treatment. The goal of this study was to characterize force-displacement and failure behaviours in the proximal femur between displacement control and impact loading fall simulations. Twenty-one human proximal femurs were tested in two ways, first to a sub-failure load at a constant displacement rate, then to fracture in an impact fall simulator. Comparisons of sub-failure energy and stiffness were made between the tests at the same compressive force. Additionally, the impact failure tests were compared with previous, constant displacement rate failure tests (at 2 and 100 mm/s) in terms of energy, yield force, and stiffness. Loading and displacement rates were characterized and related to specimen stiffness in the impact tests. No differences were observed between the sub-failure constant displacement and impact tests in the aforementioned metrics. Comparisons between failure tests showed that the impact group had the lowest absorbed energy, 24% lower maximum force and 160% higher stiffness than the 100 mm/s group (p <0.01 for all), but suffered from low statistical power to differentiate the donor age and specimen BMD. Loading and displacement rates for the specimens tested using impact varied during each test and between specimens and did not show appreciable viscoelasticity. These results indicate that constant displacement rate testing may help understand sub-failure mechanical behaviour, but may not elucidate failure behaviours. The differences between the impact and constant displacement rate fall simulations have important ramifications for interpreting the results of previous experiments. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.
机译：了解近端股骨骨折可产生新的裂缝预防筛选和治疗靶标。本研究的目标是在位移控制与冲击载荷模拟之间的近端股骨中表征力位移和失效行为。以两种方式测试二十一体的人近端股骨，首先以恒定的位移速率进行副出现载荷，然后在冲击落后模拟器中裂缝。在相同压缩力的试验之间进行子故障能量和刚度的比较。此外，在能量，屈服力和刚度方面将冲击破坏试验与先前的恒定位移率衰竭试验（在2和100mm / s处进行比较。装载和排量率的特征在于并与冲击试验中的标本刚度相关。在上述度量中的子故障恒定位移和冲击试验之间没有观察到差异。失败测试之间的比较表明，冲击组具有最低的吸收能量，最大力24％，比100 mm / s组更高的刚度160％（全部P <0.01），但遭受低统计功率以区分供体年龄和标本BMD。使用撞击在每次测试期间和标本之间使用抗冲击的样本的装载和位移率，并且没有显示出明显的粘弹性。这些结果表明，恒定的位移率测试可能有助于了解子故障机械行为，但可能不会阐明失败行为。影响和恒定位移率下降模拟之间的差异具有解释先前实验结果的重要影响。皇冠版权（c）2014由elestvier有限公司出版。保留所有权利。

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