Interlaminar fracture toughness had been the subject of great interest for several years and is still interesting to the research community. In this article, a comprehensive analysis of fracture toughness in FRP laminates is presented. Primarily, toughness studies are undertaken on glass and carbon fiber reinforced composites under mode-I and mode-II loading conditions. The fracture behavior and its failure pattern depend on a number of parameters: fiber sizing/coating, matrix modification, insert film, fiber volume fraction, stacking sequence, specimen geometry, loading rate and temperature change. In fact, a state-of-the-art process enables increasing fracture resistance with “matrix toughening by carbon nanotubes (CNT) inclusion”. It enables production of materials having ultra-high strength and low weight. The present study has highlighted the available techniques of CNT incorporation: mechanical mixing, grafting and interleaving. Other aspects, such as the dispersion level, matrix viscosity, fiber surface roughness, loading weight %, bonding strength with epoxy, height and density of grown CNT, energy absorption mechanism during delamination, etc., have been examined as well. Although a clear correlation of all these parameters with fracture toughness is hard to establish, there is growing understanding of the surface-grown CNTs and interleaving processes as they ensure significant increase in fracture toughness.

层间断裂韧性多年来一直是人们关注的主题，但对研究界仍然很感兴趣。在本文中，对FRP层压板的断裂韧性进行了综合分析。首先，在I型和II型载荷条件下对玻璃和碳纤维增强复合材料进行了韧性研究。断裂行为及其破坏方式取决于许多参数：纤维上浆/涂覆，基体改性，插入膜，纤维体积分数，堆积顺序，样品几何形状，加载速率和温度变化。实际上，最新工艺可以通过“包含碳纳米管（CNT）的基体增韧”来提高抗断裂性。这使得能够生产具有超高强度和低重量的材料。本研究突出了CNT掺入的可用技术：机械混合，接枝和交织。还检查了其他方面，例如分散水平，基质粘度，纤维表面粗糙度，负载重量％，与环氧树脂的粘合强度，生长的CNT的高度和密度，分层时的能量吸收机理等。尽管很难确定所有这些参数与断裂韧性之间的明确关联，但是由于它们确保断裂韧性显着提高，因此人们对表面生长的CNT和交织工艺有了越来越多的了解。还检查了生长的CNT的高度和密度，分层时的能量吸收机理等。尽管很难确定所有这些参数与断裂韧性之间的明确关联，但是由于它们确保断裂韧性显着提高，因此人们对表面生长的CNT和交织工艺的理解日益深入。还检查了生长的CNT的高度和密度，分层时的能量吸收机理等。尽管很难确定所有这些参数与断裂韧性之间的明确关联，但是由于它们确保断裂韧性显着提高，因此人们对表面生长的CNT和交织工艺的理解日益深入。