The type of buckling that occurs on a plate depends on its width to thickness ratio.
Inelastic buckling can happen in plates with a low width to thickness ratio, whereas elastic buckling is more likely in plates with a high width to thickness ratio. For a column of intermediate length, buckling happens somewhere in the middle, when the stress in the column surpasses the material's proportionate limit but before the stress reaches its maximum strength. Inelastic buckling is the term for this kind of circumstance. When a material is loaded under compression, a critical load may cause it to buckle. This initial buckling will be elastic and recoverable when the applied compressive stress is lowered if loading is done at a constant strain rate.
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