含斜坡复合材料夹芯壁板剪切稳定性研究

Buckling Analysis of Composite Sandwich Panels with Tapered Region Subjected to Shear Load

建立了泡沫夹芯壁板在剪切载荷作用下的屈曲及后屈曲渐进损伤模型,仿真和试验结果吻合较好,验证了该模型的有效性。研究了壁板屈曲、后屈曲及最终失效的损伤演化过程,并分析了面板-夹芯过渡区域及芯层参数对壁板稳定性、承载能力及失效模式的影响。结果表明:芯层厚度增加能有效提高壁板的屈曲载荷及极限承载能力。芯层厚度较小时,壁板破坏前出现明显的屈曲波形。随着芯层厚度不断增大,壁板趋于纯剪切破坏模式;面板-夹芯过渡区使得壁板初始屈曲位置发生改变,并影响结构的传力路径及失效模式。

A progressive damage model of sandwich panels was established.The numerical simulation results agree well with the experimental data,which verifies the reliability of the proposed model.Furthermore,the damage evolution process of buckling,post-buckling and final failure was studied.The effects of the laminate-sandwich transition zone and the core parameters on the structural stability,load-carrying capacity and failure modes were also well investigated.Results show that the buckling load and the ultimate carrying capacity of the sandwich panels increase gradually with the increasing of the core thickness.Sandwich with smaller core thickness fails under shearing load after buckling occurs,while the one with thicker tends to fail under pure shear with little post-buckling deformation.The laminate-sandwich transition zone has influence on the initial buckling position of the panels and the force transmission path as well as failure modes.