Comparison of specimen-specific vertebral body finite element models with experimental digital image correlation measurements

详细信息    查看全文

• 作者：Hannah M. Gustafson^a ; ^{hgustafs@interchange.ubc.ca} ; Peter A. Cripton^a ; ^{cripton@mech.ubc.ca} ; Stephen J. Ferguson^b ; ^{sferguson@ethz.ch} ; Benedikt Helgason^b ; ^{bhelgason@ethz.ch}
• 关键词：Digital image correlation ; Vertebra ; Compression ; Specimen-specific ; Finite element modeling
• 刊名：Journal of the Mechanical Behavior of Biomedical Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：65
• 期：Complete
• 页码：801-807
• 全文大小：844 K
• 卷排序：65

文摘

The purpose of this study was to load cadaveric vertebral bodies (n=6) in compression and compare the response, measured with digital image correlation (DIC) on the cortex, with the predicted response from specimen-specific vertebral finite element (FE) models. Five modulus-density relationships were evaluated, and for the strongest modulus-density relationship, the correlation between the DIC and FE displacements had R2 values from 0.75 to 0.93. The stiffnesses derived from the DIC measurements were strongly predicted by the FE stiffnesses (R2=0.90). DIC provides full-field measurements of surface displacement, eliminating the influence of system compliance, for validation of specimen-specific models.