Characterizing hypervelocity (>2.5 km/s)-impact-engendered damage in shielding structures using in-situ acoustic emission: Simulation and experiment. (January 2018)

• Record Type: Journal Article
• Authors: Liu, Menglong; Wang, Qiang; Zhang, Qingming; Long, Renrong; Su, Zhongqing
• Is Part Of: International journal of impact engineering. Volume 111(2018)
• Page Start: 273
• Page End: 284
• Publication Date: 2018-01
• Subjects: Hypervelocity impact -- Acoustic emission -- Space structures -- Impact detection -- Damage detection; Impact -- Periodicals; Shock (Mechanics) -- Periodicals; Impact -- Périodiques; Choc (Mécanique) -- Périodiques; Impact; Shock (Mechanics); Periodicals; 620.1125
• DOI: 10.1016/j.ijimpeng.2017.10.004
• Languages: English
• ISSNs: 0734-743X

Abstract

Highlights: In-depth investigation on the traits of hypervelocity impact (HVI)-induced acoustic emission (AE) and HVI-caused damage. Dedicated HVI testing, with comprehensive comparison with simulation. Hybrid modeling by integrating particle-based SPH and element-based FE. For the first time, a built-in piezoelectric sensor network used for in-situ measurement of AE signals during HVI. An enhanced, delay-and-sum-based imaging algorithm to "visualize" HVI spots in pixelated images accurately and instantaneously. 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.