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基于复合材料补片基体和胶层树脂黏弹性的特点,分别采用光固化和传统热固化方式制备了一系列不同树脂配方的试样,实验研究了树脂配方对修理结构应变率效应的影响,测定了复合材料粘接修理结构在不同加载速率下的力学性能。结果表明,树脂体系的交联度较低时,应变率效应更明显;加载速率的提高通常会使补片更好地发挥分担载荷的作用,但是也会导致变形协调能力的下降;这两个因素共同影响复合材料粘接结构的最终修理效率。加载速率对于复合材料粘接修理结构的破坏模式也有影响。
Based on the characteristics of the viscoelastic properties of the composite patch substrate and the adhesive layer resin, a series of samples with different resin formulations were prepared by photocuring and conventional thermal curing respectively. The effect of the resin formulation on the strain rate effect of the repaired structure was investigated experimentally. The mechanical properties of composite bonded repair structures at different loading rates. The results show that when the degree of crosslinking of the resin system is low, the strain rate effect is more obvious. The increase of the loading rate usually causes the patch to better play the role of sharing the load, but also leads to the decrease of the deformation coordination ability. Factors together affect the final repair efficiency of the composite bonding structure. The loading rate also has an effect on the failure mode of the composite bond repair structure.