Simulation and Analysis of Low-Velocity Impact and Buckling of a CFRP

Aiming at the problem of serious internal failure of composite laminates used in aerospace product structures after low-speed impact, the VUSDFLD subroutine was developed based on the simplified three-dimensional Hashin failure criterion. The simulation method of the low-speed impact process of T800 unidirectional prepreg alternately laminated composite laminates was established, the mechanism, severity and evolution of damage during a typical low-speed impact are analyzed. Analysis of post-buckling problems of composite laminates containing internal damage after being subjected to different impact levels based on finite element simulation method. The damage to the internal fibers and matrix of the laminate under different impact conditions, the ultimate compressive strength and energy threshold corresponding to the sudden drop in structural bearing capacity under different damage levels was explored. This provides a reference for studying the damage mechanism and mechanical properties of this type of composite materials under low-speed impact.