Amorphous alloy reinforced Whipple shield structure

• Published in: International journal of impact engineering Vol. 42; pp. 1 - 10
• Main Authors: Huang, X., Ling, Z., Liu, Z.D., Zhang, H.S., Dai, L.H.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.04.2012; Elsevier
• Subjects: Aluminum base alloys; Amorphous alloy; Amorphous alloys; Bumpers; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Glasses (including metallic glasses); Hypervelocity impact; Impact velocity; Materials science; Metallic glass; Metallic glasses; Physics; Projectiles; Shields; Solid mechanics; Specific materials; Structural and continuum mechanics; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); Walls; Whipple shield; Amorphous alloy; Whipple shield; Hypervelocity impact; Metallic glass; Space application; Hole; Melting; Low speed; Bumpers; Thermal wave; High temperature; Experimental study; Coatings; Shock wave; Reinforced structure; Heat source; Dimensional analysis; High speed; Gas gun; Impact test; Mechanical shock; Damaging
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/j.ijimpeng.2011.11.001

In this paper, a new concept space shield structure, namely amorphous alloy reinforced Whipple shield structure, is proposed. A series of experiments have been performed on this new Whipple shield structure which consists of an amorphous alloy reinforced bumper and an LY12 Al (similar to 2024 Al alloy) rear wall using two-stage light-gas gun at impact velocities of 3.5 km/s and 5.5 km/s. Damages including penetration hole in the front bumper and craters on the rear wall have been studied, and it is found that the protective capability of Whipple shield was improved by replacing LY12 Al alloy bumper with Fe-based amorphous alloy reinforced bumper, especially at low impact velocity of 3.5 km/s. A dimensional analysis of the parameters involved in the hypervelocity impact indicates that the coating material with higher density, lower specific heat and not very high melting temperature is helpful for better performance of the new shields. Wave propagation in the projectile and bumper is discussed, and the shock wave strength and temperature rise are calculated, it is found that the amorphous alloy reinforced bumper can produce higher shock pressures and induce higher temperature rise in the projectile. Thus, our preliminary research shows some positive indications that the new Whipple shield structure may provide higher protection level than the traditional one. ► A new concept space shield structure was proposed. ► The new shield increased the protection level in hypervelocity impact experiments. ► Two-layer structure bumpers helped to get better performance.