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Optimum recovery time for cyclic compression tests on bovine brain tissue

Mohajery, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.24200/sci.2019.21418
  3. Publisher: Sharif University of Technology , 2019
  4. Abstract:
  5. In conducting mechanical tests on the brain tissue, it is preferred to perform multiple tests on the same sample. In this study, we investigated the behavior of the bovine brain tissue in repeated compression tests wit h 0 recovery periods (namely, 10, 60, 120, 180, 240, and 300 s). Compression tests were performed on cylindrical samples with average diameter and height of 18.0 mm and 15.0 mm, respectively. Two testing protocols were employed; t he first one comprised experiments wit h 5, 25, and 125 mm/min loading speeds up to 33% strain and the second one consisted of tests with 25 and 125 mm/min loading speeds up to 17% strain. Each experiment was conducted in two cycles separated by a specific recovery period. Stress-strain data from the first, and second cycles were compared using 3 criteria, namely Normalized Root-Mean-Square Error (NRMSE), coefficient of variation (R2), and Effective Height Ratio (EHR). The analysis suggested that the optimum recovery periods for the first, and second protocols were 120 s and 180 s, respectively. Moreover, differences between the first and second cycles in medium- A nd high-speed tests were found to be smaller than those in the low-speed experiments. ©2019 Sharif University of Technology. All rights reserved
  6. Keywords:
  7. bovine brain tissue ; Brain tissue modeling ; Preconditioning effect ; Recovery time ; Strain history ; Compression testing ; Mammals ; Mean square error ; Recovery ; Bovine brain ; Brain tissue models ; Coefficient of variation ; Cyclic compression ; Cylindrical samples ; Root mean square errors ; Tissue ; Brain ; Data set ; Experimental design ; Experimental study ; Modeling ; Testing method ; Bovinae
  8. Source: Scientia Iranica ; Volume 26, Issue 4A , 2019 , Pages 2203-2211 ; 10263098 (ISSN)
  9. URL: http://scientiairanica.sharif.edu/article_21418.html