考虑短纤维在层间杂乱分布特点,基于基体剥落和纤维拉出耦合,建立了层间短纤维夹层的桥联增韧模型和解法,用于分层韧度增量ΔGIC的预报,讨论了短纤维长度和模量的影响·计算结果表明,当碳纤维/树脂层板在层间加入少量的Kevlar短纤维时,层间裂纹张开位移导致短纤维从基体中剥离,在纤维中引起的张力产生桥联力并使纤维拉出,在纤维间相互干扰下,拉出过程中产生的能量耗散使层间断裂韧性明显提高·算例表明,中等界面摩擦、较长的纤维长度和较高的模量有利于提高ΔGIC·计算结果与Sohn和Hu的实验比较表明,建议的模型是合理有效的· Considering the disorderly distribution of short fibers, the bridge toughening model and solution method of interlaminar short fiber sandwich were established based on the matrix exfoliation and fiber pull-out coupling, which was used to predict ΔGIC of delamination toughness. The short EFFECTS OF FIBER LENGTH AND MODULION • The results show that when a small amount of Kevlar short fibers are added between the layers of the carbon / resin laminate, the open crack propagation between the layers causes the short fibers to peel off the matrix and tension in the fibers is induced The bridge forces and pulls out the fiber. Under the mutual interference of the fibers, the energy dissipation during the pull-out process improves the interlaminar fracture toughness obviously. The examples show that the friction of medium interface, longer fiber length and higher Modulus helps to improve ΔGIC • Computation Results Compared to Sohn and Hu’s experiments, the proposed model is reasonably efficient