Ballistic and drop-weight impact studies of GLARE 5 fiber-metal laminates
Item
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Title
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Ballistic and drop-weight impact studies of GLARE 5 fiber-metal laminates
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Identifier
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d_2009_2013:26ce14bac847:11455
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identifier
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11907
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Creator
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Seyed Yaghoubi, Ali,
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Contributor
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Benjamin Liaw
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Date
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2012
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Language
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English
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Publisher
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City University of New York.
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Subject
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Mechanical engineering | Ballistic Impact | Finite Element Analysis | GLARE 5 Fiber-Metal Laminates | Low-Velocity Impact | Stacking Sequence Effect | Thickness Effect
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Abstract
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The aim of this study is to investigate the low-velocity and ballistic impact responses of the GLARE 5 fiber-metal laminates (FMLs) of various thicknesses, stacking sequences and geometries. When subjected to low-velocity impact, thicker GLARE 5 FMLs offered higher impact resistance. It was found that the failure mode changed with varying thickness and impactor mass. The experimental results showed that the threshold cracking energy changed parabolically with respect to the impact velocity, metal volume fraction (MVF) and the specimen thickness. The impact properties of the FMLs were also affected by laminate stacking sequence. Moreover, the damage patterns and impact behaviors were almost invariant to the change in the specimen geometry.;Three different techniques, namely: laser-beam optoelectronics, chronograph and high-speed photography were used to measure projectile velocities along the ballistic trajectory. The classical Lambert-Jonas' equation was very useful in obtaining the ballistic limit velocities (V50), especially for the cases when obtaining lower incident velocity was difficult experimentally. It was found that by changing the geometry from a plate to a beam, the ballistic limit velocity increased. The results showed that V50 varied in a parabolic trend with respect to the MVF and the specimen thickness for both geometries. On the other hand, changing the stacking sequence had a less pronounced effect on V50 for both geometries. GLARE 5 beam and plate specimens developed damage similar to both monolithic aluminum alloy and polymer composite laminate. The interfacial debonding as well as the aluminum layers bending and stretching were considered to be the major aspects in dissipating the impact energy in the specimens. However, the permanent global bending deformation of the FML plates was less pronounced compared to the FML beams.;Good agreement between FE and experimental results was obtained. The FE results revealed that for the cross-ply beam and plate specimens, the maximum contact force was the highest for the thickest specimen; whereas it was the lowest for the thinnest one. On the other hand, for a given specimen configuration, by increasing the projectile incident velocity up to near its V50, the maximum contact force increased. By further increasing the projectile speed above its ballistic limit velocity, the maximum contact force was almost insensitive with respect to an increase in the projectile incident impact velocity. Similar conclusion was also achieved for beam and plate specimens with different lay-up orientations.
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Type
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dissertation
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Source
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2009_2013.csv
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degree
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Ph.D.
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Program
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Engineering
