Why are compression-test specimens kept short and stubby?

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In materials testing, compression-test specimens are kept short and stubby to prevent buckling.

When a structural component is significantly longer than it is wide, it is prone to bending or forming bulges under a compressive load before the material itself actually fails. By using short, stubby specimens, engineers ensure that the sample remains stable during the test, allowing for an accurate measurement of the material's response to compression rather than a premature failure caused by structural instability.1