The estimation method of friction in unconfined compression tests of liver tissue

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
Jing YangJianwei Cui

Abstract

In traditional unconfined compression tests, the friction between platform and specimen is often considered negligible or minimized by lubrication or other means. However, friction can affect the estimation of material parameters. The percentage difference in radial deformation was investigated in this study. A novel friction estimation method was established and verified using a finite element method. The proposed method was based on the radial deformation during the compression process. Three different hyperelastic material parameters of liver tissue were applied in the simulations. The hyperelastic parameters H1 were obtained by no-slip compression tests, while the others were extracted from the literature. The results showed that the percentage difference in radial deformation was mainly influenced by the friction coefficient and diameter-to-height ( d/ h) ratio of the specimen in unconfined compression tests. The percentage difference increased as the friction coefficient and d/ h increased. Different d/ h and friction coefficient values were tested to validate the proposed method, and the accuracy was estimated to exceed 86%. An optimization strategy for material parameters in unconfined compression tests was proposed acc...Continue Reading

References

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Citations

Jul 18, 2020·Scientific Reports·Georges HattabStefanie Speidel
Dec 29, 2020·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Faezeh EskandariMehdi Shafieian
Jan 8, 2021·International Journal of Computer Assisted Radiology and Surgery·Jing YangLingtao Yu

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