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板受压时通常发生屈曲破坏,尤其是当板厚与板的其他尺寸相比十分小时,这种破坏模式常先于强度破坏。受拉情况下也可能发生屈曲破坏,尤其是带裂缝板沿压应力方向,在缺陷周围经常发生局部屈曲现象。通过考虑各种几何、力学和边界特性,对受拉和受压状态下,各种带裂缝矩形弹性薄板的屈曲现象进行分析。简略回顾了板的屈曲破坏,采用有限元方法,进行几个参数分析,通过改变几何和力学参数,确定受压或受拉状态下的临界荷载因子。对不同的裂缝长度、裂缝方向和材料的泊松系数以及通过变化板的边界条件,确定屈曲临界荷载因子。借助几何非线性分析,考虑裂缝界面之间的作用,对裂缝的构造进行研究,以有效掌握整体结构的性能。针对各种受限带裂缝受压或受拉板的屈曲破坏中提参数的敏感性,给出计算结果的简图,得出一些实用的结论。
Buckling damage usually occurs when the plate is pressed, especially when the plate thickness is very small compared to the other dimensions of the plate, and this failure mode often precedes the strength failure. Buckling damage may also occur under tension, especially in the direction of compressive stress with a crack plate, local buckling often occurs around the defect. By considering various geometrical, mechanical and boundary characteristics, the buckling phenomena of various rectangular plates with cracks under tension and compression are analyzed. A brief review of the buckling failure of the plate is carried out. The finite element method is used to analyze several parameters. By changing the geometrical and mechanical parameters, the critical load factor under compression or tension is determined. The buckling critical load factors are determined for different crack lengths, crack orientations and Poisson coefficients of the materials, as well as by varying the boundary conditions of the plates. With the help of geometrical non-linear analysis, the effect of interface between fractures is considered, and the structure of fractures is studied to effectively grasp the performance of the whole structure. Aiming at the sensitivity of the parameters of the crack in various confined zones or the buckling damage of the tension plate, the calculation results are given and some practical conclusions are drawn.