Test analysis on the flexural performances of repaired honeycomb sandwich structures
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摘要: 采用四点弯加载方式研究分析了含损伤蜂窝夹层修理结构的弯曲性能,该夹层结构由碳纤维增强的聚合物面板和蜂窝芯子组成。进一步分析了挖补斜度、挖补方式、损伤程度、修理设备和修理材料对修理板弯曲性能的影响。研究表明,修理板的破坏模式可分为补片边缘折断、补片中面折断和胶层破坏三种,相同破坏模式修理板的名义弯曲强度相近,其中前两种破坏模式修理板的名义弯曲强度与完好板相近,而第三种破坏模式修理板的名义弯曲强度相对较低。所有修理板的名义弯曲强度恢复率基本处于95%以上,同时修理后抗弯刚度也满足修理准则。Abstract: The flexural behavior of the repaired honeycomb sandwich structures, which were made up of carbon fiber reinforced polymer (CFRP) skins and honeycomb material, was investigated by four-point bending test. The bending performance of the repaired plate was analyzed under the influence of scarf ratio, flush repair method, damage size, repair equipment and repair material.The test results show that, the failure modes of all the repaired plate can be divided into three kinds: breaking at the edge of the patch, breaking at the middle of the patch and breaking at the adhesive film surface. The failure strength of the specimens with the same failure mode is close. The bending strength of the repaired plate of which the first two failure modes plate is similar to the undamaged plate, while the bending strength of the repaired plate of the third failure mode is relatively low. The strength recovery of all the repaired plate is basically higher than 95%. The analysis on the relative stiffness of sandwich structures shows that the stiffness of the repaired structures is close to the undamaged plate, which is consistent with the composite repair criterion.
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