This work proposes a mechanistic model to evaluate and characterize the mode II delamination of carbon-glass/fiber hybrid composites under fatigue loading. To this aim, crack growth was investigated at microscopic and macroscopic levels to measure the delamination propagation based on fracture mechanisms. The energy balance principle method described the energy release of the hybrid composite, evidencing greater energy available for fatigue delamination growth. The physics-based explanation for this enhancement is associated with the rougher fractured surface (tortuous propagation) due to the change in crack direction in the two reinforcements, stiffness synergy between the two fibers, and the silane coupling agent at the glass fiber surface. The proposed mechanistic model was used to analyze the physical-based behavior of the delamination of the hybrid and non-hybrid laminates, evidencing the contribution of each reinforcement to the SERR, with similar results at microscopic and macroscopic levels.

这项工作提出了一个力学模型来评估和表征疲劳载荷下碳-玻璃/纤维混合复合材料的 II 型分层。为此，在微观和宏观水平上研究了裂纹扩展，以测量基于断裂机制的分层扩展。能量平衡原理方法描述了混合复合材料的能量释放，证明可用于疲劳分层增长的能量更大。由于两种增强材料中裂纹方向的变化、两种纤维之间的刚度协同作用以及玻璃纤维表面的硅烷偶联剂，这种增强的基于物理学的解释与更粗糙的断裂表面（曲折传播）有关。