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通过试验和有限元方法分析了单轴压缩下加筋板的失效模式。研究了三种预置损伤位置及四种损伤尺寸的复合材料T型加筋板的线性及非线性屈曲行为,比较了损伤对临界屈曲载荷和最大失效载荷的影响。研究结果表明:损伤位置在桁条间蒙皮时,损伤的尺寸对其临界屈曲载荷和最大失效载荷影响较小;损伤位置在桁条区蒙皮时,加筋板的临界屈曲载荷随损伤尺寸的增加而明显降低,最大降低50%;损伤位置在桁条边凸缘处蒙皮时,加筋板最大失效载荷所受影响随损伤尺寸的增加而明显降低,最大降低25%。从而得到了复合材料加筋板临界屈曲载荷比和最大失效载荷比与损伤位置及尺寸的关系图。
The failure mode of stiffened plate under uniaxial compression was analyzed by means of experiment and finite element method. The linear and nonlinear buckling behaviors of T-shaped stiffened composite panels with three pre-damaged sites and four damaged sites were studied. The effects of damage on the critical buckling load and the maximum failure load were compared. The results show that the size of the damage has little influence on the critical buckling load and the maximum failure load when the damage location is between the stringer skins. The critical buckling load of the stiffened panel varies with the size of the damage The maximum failure rate was reduced by 50%. The impact of the maximum failure load on the stiffened panel was significantly reduced with the increase of the damage size, and the maximum reduction was 25%. The critical buckling load ratio, the maximum failure load ratio and the damage location and size of the composite stiffened plate are obtained.