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复合材料曲板的屈曲行为对缺陷十分敏感,研究数值模拟及试验中缺陷对屈曲性能的影响对复合材料曲板的工程应用具有重要意义。应用数值模拟方法研究了常见典型缺陷及缺陷所引起的安装误差对复合材料曲板屈曲性能的影响。建立了理想曲板模型和考虑安装误差的含缺陷曲板模型,缺陷类型包括复合材料曲板在制造过程中易产生的缺陷,如倾斜、厚度不均、翘曲。计算了模型在轴压载荷下的屈曲载荷及应变分布情况,并将含缺陷模型计算结果与理想模型进行比较。研究表明:倾斜对受载曲板的应变分布改变较大,会使试验件屈曲载荷大幅下降;翘曲对受载曲板的应变分布影响不大但会使试验件屈曲载荷大幅下降;厚度不均的缺陷对曲板屈曲性能影响较小。与含典型缺陷的曲板轴压试验结果对比,试验结果与理论研究结果一致。
The buckling behavior of the composite curved plate is very sensitive to the defects. The numerical simulation and the influence of the defects on the buckling performance in the experiment are of great significance to the engineering application of the composite curved plate. The numerical simulation method was used to study the influence of the installation errors caused by the common typical defects and defects on the buckling performance of the composite curved plate. The ideal curved plate model and the defective curved plate model considering the installation error are established. The types of defects include the defects that the composite curved plate tends to produce in the manufacturing process, such as inclination, uneven thickness and warpage. The buckling load and strain distribution of the model under axial compression are calculated, and the calculation results of the model with defects are compared with the ideal model. The results show that the change of strain distribution of inclined plate greatly changes, which will cause the buckling load of the test piece to decrease greatly. The warpage has little effect on the strain distribution of the loaded plate but greatly reduces the buckling load of the test piece. The thickness All the defects have little effect on the buckling performance of the curved plate. Compared with the results of axial compression test of curved plate with typical defects, the experimental results are consistent with the theoretical results.