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用有限元法对含有轴向裂纹的开口加强复合材料柱壳结构进行了补救研究;分析其压缩屈曲强度与模态情况,得到了裂纹长度与屈曲强度的关系,并与无裂纹的结构进行了对比。结果表明:裂纹长度在200mm以下时,对整个结构承载能力影响很小;当裂纹长度继续增大时,屈曲区域从开口上方转移到裂纹附近,屈曲强度开始急剧下降。为了加强裂纹所在区域结构的承剪能力,进行适当的修补后,可使屈曲模态与无裂纹柱壳相同,且屈曲强度稍有增加,从而证明了所提出补救方法的有效性。
The finite element method was used to remedy the open-ended composite shell structure with axial cracks. The compression buckling strength and modal condition were analyzed. The relationship between crack length and buckling strength was obtained and compared with the crack-free structure Compared. The results show that when the crack length is less than 200 mm, the bearing capacity of the whole structure is very small. When the crack length continues to increase, the buckling area begins to transfer from the top of the opening to near the crack, and the buckling strength begins to drop sharply. In order to enhance the bearing capacity of the structure in the region where the crack is located, after appropriate repairing, the buckling mode can be made the same as the crack-free cylinder shell with a slight increase in buckling strength, which proves the effectiveness of the proposed remedy.