Delamination has been introduced as the most crucial failure mechanism in laminated composites due to the absence of reinforcement along the thickness. It is necessary to investigate the phenomenon of delamination by researchers carefully to take full advantage of the composites' valuable properties. The purpose of this study is to quantify the effects of energy dissipation mechanisms on the interlaminar crack growth phenomenon in laminated composites that increase the apparent fracture toughness of these composites. The [0]₁₂, [0/90]₆ and [0₅/90/0₆] lay-ups made with carbon fiber and the epoxy matrix will be investigated with both experimental and analytical approaches. The results show an increase in the fracture toughness value of the cross-ply laminates compared to the unidirectional ones in the experimental section. According to the observations, it can be said that this increase is due to the difference in the energy absorption mechanisms (so-called toughening mechanisms), including zigzag crack propagation and fiber bridging. Using previous studies, a relationship between different parameters involved in crack growth is presented in the analytical section. Finally, using the J-integral method, the amount of energy absorbed by the fiber bridging mechanism is calculated. Also, a method for quantifying the crack zigzag growth mechanism was presented, which is estimated to increase by about 10% in increasing the fracture toughness value. By removing the effects of energy absorption mechanisms from the R-curve extracted from the experiment, it is observed that the toughening behavior of the graph is eliminated to an acceptable level, which may confirm the hypothesis of the materiality of the fracture toughness parameter in laminated composites.

由于没有沿厚度方向的增强作用，分层已被认为是层压复合材料中最关键的破坏机理。为了充分利用复合材料的宝贵性能，有必要仔细研究研究人员的分层现象。这项研究的目的是量化能量耗散机理对层状复合材料中层间裂纹扩展现象的影响，这些现象会增加这些复合材料的表观断裂韧性。的[0] ₁₂，[0/90] ₆和[0 ₅ /90/0 ₆用碳纤维和环氧基质制成的铺层将通过实验和分析方法进行研究。结果表明，与实验部分中的单向层压板相比，交叉层压板的断裂韧性值有所提高。根据观察结果，可以说这种增加是由于能量吸收机制（所谓的增韧机制）的不同，包括锯齿形裂纹扩展和纤维桥接。使用以前的研究，在分析部分介绍了涉及裂纹扩展的不同参数之间的关系。最后，使用J积分方法，计算了光纤桥接机制吸收的能量。此外，提出了一种量化裂纹之字形扩展机制的方法，据估计，在增加断裂韧性值时，其增加了约10％。通过从实验中提取的R曲线中消除能量吸收机制的影响，可以观察到该图的增韧行为被消除到可接受的水平，这可能证实了叠层中断裂韧度参数的重要性的假设。复合材料。