CFRP修复含裂纹加筋板极限强度仿真研究

Simulation study on ultimate strength of CFRP-reinforced cracked stiffened panels

    摘要
  • 摘要:
      目的  为研究碳纤维增强复合材料（CFRP）粘贴修复含裂纹加筋板的极限强度，
      方法  采用非线性有限元法对在轴向压缩载荷作用下的CFRP修复含裂纹加筋板的极限强度进行分析，基于CFRP修复含裂纹加筋板模型，对仿真结果与文献的试验结果进行比较，验证所提方法的准确性。以CFRP双面修复含裂纹加筋板为例，研究CFRP加筋板的极限强度，并对胶层剥离机理和胶层应力进行分析。
      结果  结果表明，使用CFRP修复含裂纹加筋板后其极限强度得到了明显提高，且接近于含几何初始缺陷加筋板的极限强度；CFRP修复含裂纹加筋板的脱胶行为发生在极限强度之后。
      结论  使用CFRP修复含裂纹损伤的加筋板可有效提高其极限承载能力，研究结果可为船舶与海洋工程结构修复提供参考。

     

    Abstract:
      Objectives  In order to investigate the ultimate strength of CFRP-reinforced cracked stiffened panel in ship structure repair process,
      Methods  in this paper, nonlinear finite element method is used to analyze the ultimate strength of CFRP-reinforced cracked stiffened panels subjected to axial compressive loads. Based on CFRP-reinforced cracked stiffened panel model, we compare the simulation results with the recorded test results, to verify the accuracy of the proposed method. By using double-side CFRP -reinforced cracked stiffened panel as the example, we study the ultimate strength of stiffened panel, and the peeling mechanism and the stress of the adhesive layer were analyzed.
      Results  The results show that the ultimate strength of CFRP-reinforced cracked stiffened panels is significantly increased, and is close to the ultimate strength of stiffened panel with geometric initial defects; CFRP repairs the debonding of cracked stiffened panel after the ultimate strength is achieved.
      Conclusions  The repair of the cracked stiffened panel by using CFRP can enhance the ultimate strength. It may provide guidance for the ships and offshore structure repair.

     

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