In practical engineering applications, composite materials will be subjected to low-speed impact of various energies, resulting in invisible damage and affecting the security of its use. Therefore, the purpose of this paper is to explore the impact damage evolution process and residual compressive strength of composite laminates.
In this paper, the impact behavior of T300/69 laminates with multi-angle on-edge impact and the change of residual compressive strength after-impact are studied by experiments and finite element simulation. In order to evaluate the low-speed impact behavior and explore the impact response of laminates under different impact conditions, different impact angles, impact energies and laminate thicknesses are selected in the multi-angle on-edge impact experiment. Then, the residual compressive strength of laminates after-impact is investigated by compression test under constant displacement loading.
The three-dimensional Hashin failure criterion based on strain description is used to simulate the low-speed impact process and after-impact compression process with the help of ABAQUS finite element analysis software and improve VUMAT subroutine, which introduces the improved Camanho nonlinear reduction degradation scheme. Combined with the residual compressive strength test and the microscopic analysis of damage morphology of composite laminates, the damage characteristics and mechanism of multi-angle on-edge impact are analyzed, which fully clarify the formation reasons and expansion rules of fiber and matrix damage and delamination.
The value of this study lies in predicting and characterizing the impact damage evolution process and residual compressive strength of composite material laminates, thereby providing a theoretical basis and reference for the engineering application of composite materials.
