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Identification of effective elastic modulus using modal analysis; application to canine cancellous bone.
Journal of Biomechanics ( IF 2.4 ) Pub Date : 2020-07-27 , DOI: 10.1016/j.jbiomech.2020.109972
M Blondel 1 , Y Abidine 2 , P Assemat 2 , S Palierne 1 , P Swider 2
Affiliation  

Mechanical properties of cancellous bone is of increasing interest due to its involvement in aging pathologies and oncology. Characterization of fragile bone tissue is challenging and available methodologies include quasi-static compressive tests of small size specimens, ultrasound and indentation techniques. We hypothesized that modal analysis of flexure beams could be a complementary methodology to obtain Young modulus.

The sampling methodology was adapted such that the uniqueness of the linear dynamic response was available to determine the elastic modulus from natural frequencies and mode shapes. In a first step, the methodology was validated using a synthetic bone model as control. Then, water-jet cutting allowed collecting fourteen small beam-like specimens in canine distal femurs. X-ray microtomography confirmed the microarchitecture preservation, the homogeneity and the isotropy at the specimen scale to derive effective properties. The first natural frequency in clamped-free boundary conditions was used to obtain mean values of Young modulus, which ranged from 210 MPa to 280 MPa depending on the specimen collection site. Experimental tests were rapid and reproducible and our preliminary results were in good agreement with literature data. In conclusion, beam modal analysis could be considered for exploring mechanical properties of fragile and scarce biological tissues.



中文翻译:

使用模态分析识别有效弹性模量;适用于犬的松质骨。

松质骨的机械特性由于其参与衰老病理学和肿瘤学而受到越来越多的关注。脆弱的骨组织的表征具有挑战性,可用的方法包括对小尺寸标本的准静态压缩测试,超声和压痕技术。我们假设弯曲梁的模态分析可以作为获得杨氏模量的一种补充方法。

采样方法经过调整,使得线性动态响应的唯一性可用于根据固有频率和振型确定弹性模量。第一步,使用合成骨模型作为对照来验证该方法。然后,水刀切割允许在犬股骨远端收集十四个小束状标本。X射线显微断层照相术证实了微结构的保存,样品规模的均质性和各向同性,从而获得了有效的性能。在不受限制的边界条件下的第一个固有频率用于获得杨氏模量的平均值,根据样本采集部位的不同,杨氏模量的范围为210 MPa至280 MPa。实验测试快速且可重复,我们的初步结果与文献数据非常吻合。结论,

更新日期:2020-08-05
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