文献类型：期刊文献

英文题名：Spatial resolution and measurement uncertainty of strains in bone and bone-cement interface using digital volume correlation

作者：Zhu, Ming-Liang[1,2,3];Zhang, Qing-Hang[1];Lupton, Colin[1];Tong, Jie[1]

机构：[1]Univ Portsmouth, Sch Engn, Mech Behav Mat Lab, Portsmouth PO1 3DJ, Hants, England;[2]E China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2016

卷号：57

起止页码：269

外文期刊名：JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS

收录：;EI(收录号：20160101744415);WOS:【SCI-EXPANDED(收录号:WOS:000373655500024)】；

基金：ML Zhu is grateful for a Visiting Scholarship from the China Scholarship Council (201406745023).

语种：英文

外文关键词：DVC; Sawbone; Bone-cement interface; Spatial resolution; mu FE

摘要：The measurement uncertainty of strains has been assessed in a bone analogue (sawbone), bovine trabecular bone and bone-cement interface specimens under zero load using the Digital Volume Correlation (DVC) method. The effects of sub-volume size, sample constraint and preload on the measured strain uncertainty have been examined. There is generally a trade-off between the measurement uncertainty and the spatial resolution. Suitable sub-volume sizes have been be selected based on a compromise between the measurement uncertainty and the spatial resolution of the cases considered. A ratio of sub-volume size to a microstructure characteristic (Tb.Sp) was introduced to reflect a suitable spatial resolution, and the measurement uncertainty associated was assessed. Specifically, ratios between 1.6 and 4 appear to give rise to standard deviations in the measured strains between 166 and 620 mu epsilon in all the cases considered, which would seem to suffice for strain analysis in pre as well as post yield loading regimes. A microscale finite element (mu FE) model was built from the CT images of the sawbone, and the results from the PE model and a continuum FE model were compared with those from the DVC. The strain results were found to differ significantly between the two methods at tissue level, consistent in trend with the results found in human bones, indicating mainly a limitation of the current DVC method in mapping strains at this level. (C) 2015 Elsevier Ltd. All rights reserved.