Development and validation of a series of three-dimensional finite element models of the equine metacarpus.
Development and validation of a series of three-dimensional finite element models of the equine metacarpus.
复制标题
一系列马掌骨三维有限元模型的开发和验证。
DOI：
10.1016/s0021-9290(97)00007-9
复制
发表时间：
1997
影响因子：
2.4
通讯作者：
Taylor,KT
中科院分区：
文献类型：
--
作者：
Les,CM;Keyak,JH;Stover,SM;Taylor,KT
应用Keyak等人的算法，根据定量CT数据建立了5匹成年马左侧掌骨的三维有限元模型。(1990)，J·比默德。英文12,389-397)。然后，掌骨上配备了12个玫瑰花环应变计，并在机械试验机中进行非破坏性加载。骨和模型均为轴向压缩，载荷均匀分布于腕骨远端，点载荷位于矢状面中线内侧，载荷相当于体重的3倍(−15kN)；矢状面四点弯曲载荷为−2kN。将模型的最大和最小主应变与应变计花环上的主应变进行了比较。地表主应变的预测值和观测值之间存在显著的相关性(p<；0.001)和强相关性(0.69<；r<；0.90)，最常见的是二次或三次多项式关系。在大多数情况下，特别是在极端应变值时，模型往往高估了观测到的应变值。这些数据表明，这些模型是对表面应变的稳健和准确的预测。这些模型的验证进一步支持了这种自动化三维有限元建模方法的使用，其重点是在研究应用中准确、个性化地描述结构几何和材料分布，特别是在马掌骨的生物学和力学研究中使用这些模型。
Three-dimensional finite element (FE) models of the left metacarpi of five adult horses were developed from quantitative computed tomography data, using the algorithms of Keyak et al. (1990, J Biomed. Engng12, 389–397). The metacarpi were then equipped with 12 rosette strain gauges and loaded non-destructively in a mechanical testing machine. The bones and the models were loaded in axial compression, with the load evenly distributed across the distal row of carpal bones, and with a point load placed mediad to the sagittal midline, to a load equivalent to three times body weight (−15 kN); and in sagittal four-point bending to −2 kN. Maximum and minimum principal strains from the models were compared with those at the strain gauge rosettes. There were significant (p < 0.001) and strong (0.69 < r < 0.90) correlations between predicted and observed surface principal strains, most often resolving as second- or third-order polynomial relationships. In most cases, particularly at extreme strain magnitudes, the models tended to overestimate the observed strain magnitudes. These data suggest that the models are robust and accurate predictors of surface strains. Validation of these models lends further support for the use of this method of automated three-dimensional FE modeling, with its emphasis on accurate, individualized portrayal of structural geometry and material distribution, in research applications, and specifically for the use of these models in the study of the biology and mechanics of the equine metacarpus.