Abstract
This study presents an original approach for the design of adapted Hopkinson device dedicated to the characterisation of human ribs’ cortical bone. The quasi-static study carried out on flat samples coming from this anatomical part highlighted the importance of the critical effect of sample shape and location on the accuracy of identify mechanical behaviour. The access to higher rates of strains, Hopkinson bars technique are classically required whatever compression or tension loadings. Classical designs of measurement bars are not suitable for this purpose due to the complexity of specimen’s geometry (thickness variation). In this context, a new design of SHTB is studied here on the basis on a Finite Element approach of the set measurement bars/biological coupon. Finite Element simulations have been conducted using Abaqus explicit code by varying the design configuration. The comparison on input and output elastic waves suggests a set of small diameter bars in polyamide 66 for a better signal measurement.
Highlights
Thorax is one of the segments frequently involved in road accident
The FE model improvement is most difficult in this anatomical part because of the complex geometry of ribs and its internal structure composed by thin cortical thickness, spongy bone variability and narrow
Harvesting cortical samples from fresh ribs dedicated to tensile tests is a challenging task due to the geometry
Summary
Thorax is one of the segments frequently involved in road accident. Despite that, FE models of the thorax are commonly simplified and don’t take into account all rib’s parameters. The ribs present a thin cortical thickness influencing the thorax response This cortical bone is a non-homogenous material with voids and mechanical characterisation is needed on this constitutive part to access more biofidelic FE model. Quasi-static tests are made in the frame of this project These mechanical tests are performed on thin cortical bone sample of human ribs. Quasi-static tensile tests have been performed on THOMO project on the same sample shape. The aim of this study is to extend the quasistatic results to dynamic using Split-Hopkinson Tensile Bars device. At this sample size, classical designs of SHTB are not suitable due to the complexity of specimen’s geometry (thickness sample). It was interesting to develop, thanks to FE models, new Hopkinson’s device dedicated to rib’s cortical bone characterisation
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