Effect of single-bolt repair on compression capability of carbon/epoxy composite laminates containing impact damage
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摘要: 开展了单钉修复对含冲击损伤碳纤维/环氧树脂复合材料层合板压缩承载能力影响的试验研究。测试了三种不同能量冲击后碳纤维/环氧树脂复合材料层合板的压缩承载能力及失效模式，测定了单螺栓对碳纤维/环氧树脂复合材料层合板压缩承载能力的修复效率，并借助数字图像相关技术(DIC)表征手段揭示了单螺栓修复对含冲击损伤结构失效行为的影响。结果表明：冲击后碳纤维/环氧树脂复合材料层合板的压缩承载能力随着冲击能量的增加而降低，冲击损伤破坏了碳纤维/环氧树脂复合材料层合板结构的对称性，并导致结构在加载初期呈非对称的局部屈曲变形特征，局部屈曲诱发并加剧分层损伤扩展；单螺栓修复能有效恢复结构的整体对称性，在一定程度上抑制含冲击损伤碳纤维/环氧树脂复合材料层合板的局部屈曲，达到可观的修复效率。该研究为复合材料紧固件修理方案的制订及修理损伤容限的定义提供一定的指导意义。Abstract: The efficiency of single-bolt repairing on the compression capacity of carbon/epoxy composite laminates containing impact damages was experimentally reported. The compression bearing capacity and failure modes of carbon/epoxy composite laminates with impact damage under three different level energies were studied. Simultaneously the efficiency of single bolt repairing on the compression capacity of the above-mentioned impacted carbon/epoxy composite laminates was investigated together with failure behavior based on digital image correlation (DIC) technology. The results show that the compressive load capacity of the laminated plate decreases with the increase of the impact energy, and the impact damage destroys the stiffness symmetry of the carbon/epoxy composite laminates, resulting in asymmetric local buckling deformation from the initial stage of loading. Bolt repairing can restore the overall symmetry of the carbon/epoxy composite laminates, inhibit the local buckling of the delaminated area to a certain extent, and improve considerable repair efficiency. This work is helpful for the decision of fasten repairing strategy and the definition of repair damage tolerance for composites structure.
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Key words:
- composite /
- compression after impact /
- bolt repair /
- delamination /
- local buckling
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图 3 冲击后压缩试验和数字图像相关技术(DIC)设备
Figure 3. Compression after impact test and digital image correlation(DIC) equipment
图 5 15 J能量冲击后碳纤维/环氧树脂复合材料层合板正反表面不可恢复变形
Figure 5. Unrecoverable deformation of carbon fiber/epoxy composite laminates after impact of 15 J
图 6 碳纤维/环氧树脂复合材料层合板冲击后的C扫描图像
Figure 6. C-scan images of carbon fiber/epoxy composite laminates after impact
thk—Damage position occurred in thickness direction, identifying distance between damage and upper surface
图 7 冲击前后碳纤维/环氧树脂复合材料层合板断面光学显微图像(工况D-15)
Figure 7. Optical microscopic images of cross-section of carbon fiber/epoxy composite laminates before and after impact (Case of D-15)
图 8 不同能量冲击后碳纤维/环氧树脂复合材料层合板压缩承载力
Figure 8. Compression bearing capacity of carbon fiber/epoxy composite laminates after impact with different energies
图 9 碳纤维/环氧树脂复合材料层合板的位移-载荷曲线(工况D-15)
Figure 9. Load-displacement curve of carbon fiber/epoxy composite laminates (Case D-15)
图 10 碳纤维/环氧树脂复合材料层合板冲击正面的DIC云图(工况D-15)
Figure 10. DIC images of impact surface of carbon fiber/epoxy composite laminates (Case D-15)
图 11 碳纤维/环氧树脂复合材料层合板冲击反面的DIC云图(工况D-15)
Figure 11. DIC images of back surface of carbon fiber/epoxy composite laminates (Case D-15)
图 12 压缩过程中碳纤维/环氧树脂复合材料层合板冲击正反面的变形示意图(工况D-15)
Figure 12. Deformation schematic of impact and back surface of carbon fiber/epoxy composite laminates during compression (Case D-15)
图 13 工况D-15的碳纤维/环氧树脂复合材料层合板最终失效模式
Figure 13. Final failure mode of carbon fiber/epoxy composite laminates under case D-15
图 14 单钉螺栓修补碳纤维/环氧树脂复合材料层合板
Figure 14. Single bolt-repaired carbon fiber/epoxy composite laminate
图 15 不同能量冲击的未修复和单钉螺栓修复的碳纤维/环氧树脂复合材料层合板压缩承载能力
Figure 15. Compression bearing capacity of carbon fiber/epoxy composite laminates with and without single bolt-repaired after impact with different energies
图 16 工况R-15的碳纤维/环氧树脂复合材料层合板载荷-位移曲线
Figure 16. Load-displacement curve of carbon fiber/epoxy composite laminates under case R-15
图 17 碳纤维/环氧树脂复合材料层合板冲击正面的DIC云图(工况R-15)
Figure 17. DIC images of impact surface of carbon fiber/epoxy composite laminates (Case R-15)
图 18 碳纤维/环氧树脂复合材料层合板冲击背面的DIC云图(工况R-15)
Figure 18. DIC images of back surface of carbon fiber/epoxy composite laminates (Case R-15)
图 19 压缩过程中碳纤维/环氧树脂复合材料层合板冲击正反面的变形示意图(工况R-15)
Figure 19. Deformation schematic of impact and back surface of carbon fiber/epoxy composite laminates during compression (Case R-15)
图 20 工况R-15的碳纤维/环氧树脂复合材料层合板最终失效模式
Figure 20. Final failure mode of carbon fiber/epoxy composite laminates under case R-15
图 21 损伤和单钉修复对碳纤维/环氧树脂复合材料层合板压缩刚度的影响
Figure 21. Effect of damage and bolt repair on compression stiffness of carbon fiber/epoxy composite laminates
表 1 试验工况设置
Table 1. Cases of test
Set Impact energy/J Fastener I — — D-9 9 NO D-15 15 NO D-30 30 NO R-9 9 YES R-15 15 YES R-30 30 YES Notes: I—Intact specimens; D—Damaged specimens; R—Repaired specimens. 
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