轴压铆接加筋板局部屈曲弹性支持分析方法

Local Buckling Analysis Method of Elastically Restrained Riveted Stiffened Panels Under Uniaxial Compression

考虑铆钉连接对筋条扭转弹性支持作用的影响,利用三角函数构造筋条在铆钉连接情况下的扭转支持刚度,采用里兹能量法建立轴压铆接加筋平板蒙皮局部屈曲问题的弹性支持理论分析模型及分析方法。分别采用试验方法、有限元方法、工程简化分析方法和本文分析方法对典型轴压金属Z形铆接加筋平板的蒙皮局部屈曲临界应力进行算例分析,验证了本文分析方法的合理性。在此基础上进一步研究了不同的铆钉间距和铆钉连接方式对加筋板蒙皮局部屈曲临界应力的影响。结果表明:在Z形加筋板结构形式、尺寸、铆钉间距皆为工程常用范围的前提之下,若铆钉连接方式不变,改变铆钉间距对屈曲临界应力影响不足1%;若铆钉间距不变,单排连接改为双排或者交错排可以提高屈曲临界应力约11%。

Given the influence of riveted joints on elastically rotational restraint of stiffeners,the trigonometric function was used to simulate rotational restraining rigidity of stiffener,and Ritz method was used to establish an analytical model for local skin buckling problem of riveted stiffened panels under uniaxial compression.Critical local skin buckling stresses of typical metal riveted stiffened panels with Z-shaped stiffeners were calculated and analyzed by the experimental method,the finite element method(FEM),the engineering simplified analytical method and the proposed analytical method. The reasonableness of the proposed analytical method was verified. Furthermore,the influences of rivet spacing and rivet attachment form on critical local skin buckling stresses were studied. Results showed that the variation of rivet spacing had less than 1% effects on critical local skin buckling stresses,while rivet attachment form stayed unchanged;and that double-row and interleaving-row rivet attachments could increase critical local skin buckling stresses about 11% compared with single-row rivet attachment,while rivet spacing stayed unchanged on conditions that configurations,dimensions and rivet spacing of Z-shaped stiffened panels were in common range of aerospace engineering use.