4.6 Article

Oblique Low-Velocity Impact Response and Damage Behavior of Carbon-Epoxy Composite Laminates

Journal

MATERIALS
Volume 15, Issue 15, Pages -

Publisher

MDPI
DOI: 10.3390/ma15155256

Keywords

oblique impact; laminates; impact angle; delamination damage

Funding

  1. China Postdoctoral Science Foundation [2019 M661721]
  2. Research Fund of the State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and Astronautics) [MCMS-E-0220 Y02]
  3. National Natural Science Foundation of China [11972171, 11572140]
  4. Natural Science Foundation of Jiangsu Provence [BK20180031]

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The low-velocity impact behavior of carbon-epoxy cross-ply composites was numerically investigated, examining the effect of impact angle. The results showed that an increase in impact angle intensified the action of tangential force, transferring energy absorption from normal plastic deformation to tangential deformation and friction. Delamination damage to the upper layers was more affected by tangential loads, intensifying with the increase of the impact angle, while delamination damage to lower layers was mainly determined by normal loads, weakening with the increasing impact angle overall.
The low-velocity impact behavior of carbon-epoxy cross-ply composites was numerically investigated, examining the effect of impact angle. A plastic continuum damage model, introducing the cohesive interface to describe delamination damage, was established and was validated by available experimental data. Impact histories, progressive deformation, stress transfer, and impact damage are respectively discussed. The results show that an increase in impact angle intensifies the action of tangential force, and gradually transfers energy absorption from normal plastic deformation to tangential deformation and friction, which dissipates more energy through relatively longer contact duration and larger impactor displacement. The delamination damage to upper layers is more affected by tangential loads, intensifying with the increase of the impact angle, and the damage area to the top interface is increased by 132.1% from 0 degrees impact to 60 degrees impact. Meanwhile, the delamination damage to lower layers is mainly determined by normal loads, weakening with the increasing impact angle overall, and the damage area of the lowest interface decreases by 36.6% from 0 degrees impact to 60 degrees impact.

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