Effect of velocity variation on carbon/epoxy composite damage behavior

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In this paper, the damage mechanism for carbon fiber-reinforced polymers composites was studied from low- to high-velocity impact for different velocity ranges. Initially, the composites were manufactured by using CU125NS prepreg in quasi-isotropic 16 layers pattern [0/+/- 45/90](2s) in autoclave by adopting standard procedures. Specimens were also exposed to the simulated LEO environment and 0.42% total mass loss occurred due to out-gassing. Afterwards, the specimens were impacted with Al2017-T4 spherical projectiles of 5.56mm in diameter, 0.25g in weight for different velocities ranging from 500m/s to 2200m/s. With the impact velocity increase, the energy absorption was found to increase in the composite specimens, while the ratio of energy absorbed to total impact energy remains the same on average. Mainly, the fiber breakage and matrix fracture play a critical role in energy absorption, but delamination contribution also found increasing trend with the increase of impactor velocity. Afterwards, C-SCAN analyses were conducted to investigate the damage patterns, and it was found that the damage area increased with higher velocities. The delamination contribution increased on average by 12.7% for the velocity range of 2200m/s in comparison to that for 502m/s. On the basis of these findings, it was concluded that the contribution of fiber breakage, matrix fracture and delamination towards the damage mechanism of composites is greater for higher velocities.
Publisher
SAGE PUBLICATIONS LTD
Issue Date
2016-06
Language
English
Article Type
Article
Keywords

HYPERVELOCITY IMPACT; ENVIRONMENT; SPACECRAFT

Citation

JOURNAL OF COMPOSITE MATERIALS, v.50, no.15, pp.2017 - 2024

ISSN
0021-9983
DOI
10.1177/0021998315598852
URI
http://hdl.handle.net/10203/209486
Appears in Collection
AE-Journal Papers(저널논문)
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