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开展了复合材料加筋板剪切稳定性试验,研究了加筋板在承剪状态下的屈曲载荷、屈曲模态、后屈曲承载性能及破坏模式。试验结果表明加筋板在剪切屈曲载荷下形成的屈曲波长轴线与加强件轴线夹角约45°,当屈曲比达到1.2时,存在二次屈曲行为,最终破坏载荷约为屈曲载荷1.28倍;加筋板在二次屈曲失稳前,加强件几乎保持直线,起“屈曲分隔”的作用。结合试验现象,进行了加筋板剪切屈曲及后屈曲性能理论分析,得出的理论屈曲载荷与试验屈曲载荷的相对误差为7.2%,后屈曲阶段的理论载荷-应变曲线与试验结果的相对误差在10%以内,并确定了后屈曲角随屈曲比的变化规律。
The shear stability test of composite stiffened plate was carried out. The buckling load, buckling mode, post-buckling bearing capacity and failure mode of stiffened plate under shear loading were studied. The experimental results show that the angle between the flexural wavelength axis and the axis of the stiffener formed by the stiffened plate under shear buckling load is about 45 °. When the buckling ratio reaches 1.2, the second buckling behavior exists and the ultimate breaking load is about 1.28 times of the buckling load. Stiffeners in the second buckling before buckling, stiffeners almost maintain a straight line, played a “buckling separation” effect. The theoretical analysis of shear buckling and post-buckling behavior of the stiffened plate was carried out based on the experimental phenomena. The relative error between the theoretical buckling load and the buckling load was 7.2%, and the theoretical load-strain curve after the buckling phase was in agreement with the test result The error is within 10%, and the change rule of post-buckling angle with buckling ratio is determined.