国际期刊导读

受压或受弯开孔薄板的弹性屈曲性能 摘要：开发、论证并总结了一组闭合公式，可以估算在弯矩或压力作用下，板的单个或多个开孔对其临界弹性屈曲应力的影响。公式适用于四边简支和三边简支的板（这在设计中又称为加劲板和非加劲板）。由于有限壳单元特征值屈曲分析需要运用商业有限元程序，而这些程序又不是专为结构分析而开发的，不能很方便地用于工程设计，所以可以采用这些公式作为这种屈曲分析方法的简化替代。

Closed-form expressions for approximating the influence of single or multiple holes on the critical elastic buckling stress of plates in bending or compression are developed, validated and summarized. The expressions are applicable to plates simply supported on 4 sides and plates simply supported on 3 sides, commonly called stiffened and unstiffened elements in design. The expressions serve as a convenient alternative to shell finite element eigen-buckling analysis, which requires commercial software not typically accessible to the engineering design community. The forms of the expressions are founded on classical plate stability approximations, and are developed and validated with parametric studies employing shell finite elements. The finite element parametric studies demonstrate that holes may create unique buckling modes, and can either decrease or increase a plate＇s critical elastic buckling stress depending on the hole geometry and spacing. The validated closed-form expressions and their associated limits are intended to be general enough to accommodate the range of hole shapes, locations, and spacings common in engineering practice, while at the same time also defining regimes where explicit use of shell finite element analyses is still needed for adequate accuracy.