Multi-impact behaviour of composite laminates under constant and different energy levels

• DOI: 10.1016/j.compstruct.2022.115788
• Publication Date: 2022-05-18T15:37:08Z
• Authors: P.N.B. Reis; M.A. Neto; A.M. Amaro
• Keywords: Impact energy; Constant (computer programming)

Composite laminates have been used in the most diverse engineering fields, which they are often subject to multi-impacts. Typical examples of these phenomena found wind energy industry. However, several studies focused on this subject, but involve events with same level. Therefore, work intends study multi-impact behaviour composite as well verify if a linear damage accumulation law can predict life. For purpose, low-velocity impact tests were carried out energies 4 J, 6 8 J and 10 J. From for single impacts, it was possible observe that damaged area increased by around 151.2%, promoting higher loads, displacement, bending stiffness levels, while restored decreased. In terms strength, classic SN curve adopted, number impacts failure varied inversely energy. Finally, under different lives resulting from experimental estimated based Palmgren–Miner's Law did not find good agreement.