Behaviour of uniaxially preloaded aluminium plates subjected to high-velocity impact

Abstract

a b s t r a c tThe purpose of this paper is to evaluate the behaviour of structural thin plates made of 7075-T6 aluminium alloy under normal impact of spherical steel projectiles, when they are subjected to uniaxial in-plane tensile preload. Also, nonloaded plates were tested under high-velocity impact. The impact and residual velocity were measured in all tests. From the relationships between the impact and residual velocities, the ballistic limit was estimated by a least-squares method. No significant differences were found between the ballistic limits under the two loaded conditions. Above the ballistic limit in the preloaded plates, unstable cracks that can generate the catastrophic failure of the plate were observed. At similar velocities, this phenomenon was not observed in nonloaded plates.

Gas gun ballistic testing of moving pre-stressed targets

“…The damage zones for unstressed and pre-tensioned stationary targets show a very small difference, which agrees with the tests available in the literature [4]. A comparison of tests conducted with the pre-tensioned simulated moving target set-up shows a significant variability in the residual velocity of projectile.…”

“…Utilization of this idea as an impact of inclined targets by inclined projectiles in gas gun tests has been realized in [3]. Preloaded targets have been used in ballistics studies mainly when analysing composite materials; an example of ballistic testing of aluminium targets was reported in [4].…”

Response of GLARE fiber–metal laminates under radial in-plane preloading and lateral indentation

“…10,11,15,18,19 The important role of preloading on the impact response of aluminum plates, composite laminates, and fiber-metal laminates has been indicated by many researchers. 6,17,18,22–27 In this regard, predicting the response of GLARE laminates under the simultaneous application of preloading and lateral indentation, which is the principal objective of this article, is very important as far as their overall impact behavior is concerned.…”

Projectiles Impact Assessment of Aircraft Wing Structures with Real Dynamic Load

“…The aircraft will suffer the aerodynamic load and impacting load during different flight phases of a mission, the assessment of aircraft damage becomes more complicated under this coupling effect. The aerodynamic characteristics analysis and combat process are considered separately in current research: García-Castillo S K [1] evaluated the ballistic limits of aluminium alloy under normal impact of spherical steel projectiles, when they are subjected to uniaxial in-plane. F R Ahad [2] simulated the failure of aluminium alloy under high velocity impact.…”