COMPOSITES SCIENCE AND ENGINEERING ›› 2024, Vol. 0 ›› Issue (1): 30-37.DOI: 10.19936/j.cnki.2096-8000.20240128.004

• BASIC STUDY • Previous Articles     Next Articles

Effects of different impact angles on the damage characteristic of composite laminates under low-velocity impact

LIN Yi, LIU Ling*   

  1. School of Aerospace Engineering and Applied Mechanics, Tongji University, Shanghai 200092, China
  • Received:2023-01-18 Online:2024-01-28 Published:2024-02-27

Abstract: Composite structures are usually subjected to low-velocity impact during service, which results in invisible internal damage and decreases the loading ability of structures. In the actual engineering, when the low-velocity impactor interacts with the structure, it may present different impact angles. Consequently, in this paper, focusing on a typical layup of carbon/epoxy laminate, a low-velocity impact numerical model of 90° and different impact angles were established using ABAQUS. The model is used to analyze the effects of different impact angles to the contact force and damage of laminate, and the effects of second contact caused by impactor rotation to damage. In numerical model, the intralaminar damage was simulated using the continuum damage mechanics and 3D Hashin criterion. The interlayer delamination was simulated using cohesive model and bilinear tractor-separation constitutive relation. The comparison between the 90° simulation result and the test result proves the reliability of the numerical model. The simulation results of different impact angles show that, when the impact angle increases from 30° to 90°, the normal contact force always increases, while the tangential contact force first increases and then decreases. With the decrease of the impact angle, the overall deviation of the damage is more obvious, and the damage areas caused by the matrix tension is always larger. The simulation results of the successive contact under different energies show that, with the increase of impact energy, the impact angle range causing the successive contact decreases, and the successive contact causes new damage to the top of laminates.

Key words: composite, low-velocity impact, oblique impact, damage

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