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http://hdl.handle.net/10397/74675
Title: | Characterizing hypervelocity (>2.5 km/s)-impact-engendered damage in shielding structures using in-situ acoustic emission : simulation and experiment | Authors: | Liu, M Wang, Q Zhang, Q Long, R Su, Z |
Issue Date: | Jan-2018 | Source: | International journal of impact engineering, Jan. 2018, v. 111, p. 273-284 | Abstract: | Pervasive in outer space, hypervelocity impact (HVI), caused by man-made debris (a.k.a. space junk) and natural micrometeoroids, poses a clear and tremendous threat to the safe operation of orbiting spacecraft, and it will possibly lead to the failure of a space exploration mission. Addressing such an issue, damage in a downscaled two-layer space shielding assembly, engendered by HVI events with an impact velocity up to 4 km/s, was characterized quantitatively, using in-situ measured acoustic emission (AE) induced under HVI. A hybrid model, based on three-dimensional smooth-particle hydrodynamics and finite element, was developed, to achieve insight into the traits of HVI-induced AE waves and HVI-caused damage. Proof-of-concept simulation was accomplished using the hybrid model, in which a projectile, at various impact velocities, impinged a series of shielding assembly of different thicknesses, in a normal or oblique manner. Experimental validation was implemented, and HVI-induced AE waves were in-situ acquired with a built-in piezoelectric sensor network integrated with the shielding assembly. Results from simulation and experiment show qualitative consistency, demonstrating the capability of the hybrid model for depicting HVI-produced shock waves, and the feasibility of in-situ measurement of HVI-induced AE signals. Taking into account the difference and uniqueness of HVI against other ordinary impact cases, an enhanced, delay-and-sum-based imaging algorithm was developed in conjunction with the built-in sensor network, able to “visualize” HVI spots in pixelated images accurately and instantaneously. | Keywords: | Acoustic emission Damage detection Hypervelocity impact Impact detection Space structures |
Publisher: | Pergamon Press | Journal: | International journal of impact engineering | ISSN: | 0734-743X | EISSN: | 0734-743X | DOI: | 10.1016/j.ijimpeng.2017.10.004 | Rights: | © 2017 Elsevier Ltd. All rights reserved. © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Liu, M., Wang, Q., Zhang, Q., Long, R., & Su, Z. (2018). Characterizing hypervelocity (> 2.5 km/s)-impact-engendered damage in shielding structures using in-situ acoustic emission: simulation and experiment. International Journal of Impact Engineering, 111, 273-284 is available at https://doi.org/10.1016/j.ijimpeng.2017.10.004 |
Appears in Collections: | Journal/Magazine Article |
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