Energy-absorption analyses of grooved Al-sheet stacks using modified split Hopkinson pressure bar
SCIE
SCOPUS
- Title
- Energy-absorption analyses of grooved Al-sheet stacks using modified split Hopkinson pressure bar
- Authors
- Kim, Selim; Kang, Hyungu; Kim, Minu; Kim, Ki Jong; Lee, Jae Min; Cheong, Hae-Won; Kim, Hyoung Seop; Lee, Sunghak
- Date Issued
- 2023-10
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- This study suggests that stacks of thin aluminum (Al) sheets with fine rectangular or triangular grooves are effective materials for energy absorption. The energy-absorbing performance of these materials was evaluated using a modified split Hopkinson pressure bar (SHPB). Two important energy-absorbing parameters, impact momentum (I) and maximum impact acceleration (amax), were measured from stress-time (sigma-t) curves. These parameters were found to vary with groove shape, groove cavity fraction, and specimen thickness. Both I and amax showed a continuous decrease as the specimen thickness increased from 6 to 18 mm or as the groove cavity fraction increased from 29-30% to 38-39%. Analyzing the sigma-t curve shapes revealed that the triangular grooved specimens exhibited broad-peak shaped curves, resulting in a greater reduction in I compared to the broadened plateau shape observed in the rectangular grooved specimens. Taking into account both I and amax, the overall energy-absorbing performance of the triangular grooved specimens was better than that of the rectangular grooved specimens. Notably, in the triangular grooved specimens with a high cavity fraction, the triangular embossing intruded into the groove cavities, resembling a 'zipper' mechanism, further enhancing the effectiveness of energy absorption. This study presents a promising approach for developing various grooved Al sheet stacks that exhibit reduced amax and I by strategically exploring suitable groove shapes, cavity fractions, and stack thicknesses, especially in dynamically compressed artillery environments.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/120392
- DOI
- 10.1016/j.msea.2023.145721
- ISSN
- 0921-5093
- Article Type
- Article
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, vol. 886, 2023-10
- Files in This Item:
- There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.