...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Biomechanics >Effect of displacement rate on the tensile mechanics of pediatric cervical functional spinal units
【24h】

Effect of displacement rate on the tensile mechanics of pediatric cervical functional spinal units

机译：位移速率对小儿颈椎功能性脊柱单位拉伸力学的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study examined the effect of loading (displacement) rate on the tensile mechanics of cervical spine functional spinal units. A total of 40 isolated functional spinal units (two vertebrae and the adjoining soft tissues) from juvenile male baboons (10 +/- 0.6-human equivalent years old) were subjected to tensile loading spanning four orders of magnitude from 0.5 to 5000mm/s. The stiffness, ultimate failure load, and corresponding displacement at failure were measured for each specimen and normalized by spinal geometry to examine the material properties as well as the structural properties. The tensile stiffness, failure load, normalized stiffness, and normalized failure load significantly increased (ANOVA, p < 0.001) with increasing displacement rate. From the slowest to fastest loading rate, a two-fold increase in stiffness and four-fold increase in failure load were observed. The tensile failure strains (1.07 +/- 0.31 mm/mm strain) were not significantly correlated with loading rate (ANOVA, p = 0.146). Both the functional (non-destructive stiffness and normalized stiffness) and failure mechanics of isolated functional spinal units exhibited a power-law relationship with displacement rate. Modeling efforts utilizing these rate-dependent characteristics will enhance our understanding of the tensile viscoelastic response of the spine and enable improved dynamic injury prevention schemes. (c) 2004 Elsevier Ltd. All rights reserved.
机译：这项研究检查了加载（位移）速率对颈椎功能性脊柱脊髓单位拉伸力学的影响。对来自幼年狒狒（10 +/- 0.6-人当量岁）的总共40个分离的功能性脊柱单位（两个椎骨和相邻的软组织）进行了从0.5到5000mm / s四个数量级的拉伸载荷。测量每个样品的刚度，极限破坏载荷和相应的破坏位移，并通过脊柱几何形状进行归一化，以检查材料性能以及结构性能。随着位移速率的增加，拉伸刚度，破坏载荷，归一化刚度和归一化破坏载荷显着增加（ANOVA，p <0.001）。从最慢到最快的加载速度，观察到刚度增加了两倍，而破坏载荷增加了四倍。拉伸破坏应变（1.07 +/- 0.31 mm / mm应变）与加载速率没有显着相关（ANOVA，p = 0.146）。隔离的功能性脊柱单元的功能性（非破坏性刚度和归一化刚度）和失效力学都表现出与位移率的幂律关系。利用这些速率相关特性进行建模的工作将增强我们对脊柱拉伸粘弹性响应的理解，并能够改进动态损伤预防方案。 （c）2004 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号