研究了复合材料曲梁在受到合拢弯矩作用下发生的屈曲情况,并给出一种理论解析方法来分析这种很可能发生在复合材料弯曲结构中的脱层耦合屈曲问题。该方法是基于曲梁大变形理论及断裂力学而提出来的。文中并用该解析方法分析了一个特定的常见的情况,在该题例中脱层发生在非常靠近内表面处并且突变屈曲就发生在该薄脱层。在文中也对脱层裂纹的弧角对极限载荷的影响进行了研究。 The buckling of the composite curved beam under the action of folded moment is studied and a theoretical analysis method is given to analyze the delamination coupled buckling problem that is likely to occur in the curved composite structure. The method is based on the large deformation theory and fracture mechanics of curved beams. In this paper, a specific and common situation is analyzed using this analytical method, in which case delamination occurs very close to the inner surface and sudden buckling occurs at this thin delamination. In the paper, the influence of the arc angle of delamination crack on the ultimate load is also studied.