Study of equi-energetic effects on the low-velocity impact and compression after impact response of carbon fiber composite tube structures

This study investigates the equi-energetic low-velocity impact (LVI) and compression after impact (CAI) response of tubular CFRP structures. Various layups and geometries are employed to understand the effects of impact energy, configurations, and damage on the CAI behavior. Low mass-high velocity (LMHV) impact results in greater absorbed energy than high mass-low velocity (HMLV). Impact damage formation, especially circumferentially, significantly affects CAI strength. Braided tubes show higher impact resistance, but weaker compressive strength compared to unidirectional/twill tubes. A new analytical model provides accurate prediction of CAI strength. This study emphasizes the importance of impact energy and lay-up configurations in CFRP design. [Display omitted] •Study on equi-energetic low-velocity impacts and effect on CFRP tube compression.•Braided tubes resist impact better but have lower compression strength.•Low-mass high-velocity absorbs more energy due to high strain rates and stresses.•Circumferential damage lowers CAI strength by reducing critical crack stress.•A new analytical model predicts CAI strength of tubes more accurately.