Abstract:
Variable angle composite materials exhibit excellent mechanical properties and enhanced design flexibility. Investigating the mechanical behavior and damage characteristics of variable angle composite structures is of significant scientific value for engineering applications and structural design. The element-based peridynamics (EBPD) theory, which is based on integro-differential equations, avoids singularity issues when dealing with discontinuities and can conveniently handle fracture problems compared to classical continuum mechanics methods. By establishing a correspondence between the positions of virtual element integration points and fiber angles, an EBPD model for variable angle composite laminates was proposed. The reliability of the model was verified through deformation simulations of variable angle composite laminates with different initial edge angles and a central circular hole. The model also predicts crack propagation paths in laminates with different angles. The proposed model can accurately characterize the deformation and failure modes of variable angle composite laminates, providing theoretical guidance for strength assessment and structural design.