变厚度复合材料加筋壁板剪切屈曲及后屈曲承载能力研究

Study on Shear Buckling and Post-buckling Capacity of Composite Stiffened Panels with Variable Thickness

为有效提高复合材料主承力结构效率,变厚度复合材料层压结构承载能力研究具有重要意义。基于ABAQUS中Continuum Shell单元模拟变厚度复合材料层压结构,采用特征值法和渐进损伤失效法求解长桁横截面积不同的两块变厚度复合材料加筋壁板剪切屈曲及后屈曲承载能力。研究结果表明:其屈曲载荷和后屈曲载荷数值分析值与试验值相对误差不大于4%,即该模型构建及求解方法可以准确预测其屈曲载荷和后屈曲载荷;加筋壁板剪切载荷承载能力由蒙皮起决定性作用,通过改变长桁横截面积不能有效提高其屈曲载荷和后屈曲载荷。

In order to effectively improve the efficiency of composite main bearing structure, it is of great significance to study the bearing capacity of composite laminated structures with variable thickness. In this paper, based on the continuum shell element of ABAQUS, the shear buckling and post buckling capacity of two variable thickness composite stiffened panels with different stringer cross-sectional areas are calculated by using eigenvalue method and progressive damage failure method. The results show that the relative error between the numerical analysis value and the testing value of buckling load and post buckling load is less than 4%, that is, the model construction and solution method can accurately predict the buckling load and post buckling load;the shear load bearing capacity of stiffened panel is determined by the skin, and the buckling load and post buckling load cannot be effectively improved by changing the cross-sectional area of the stringer.