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unconfined compressive strength

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1. n. [Geology, Geophysics, Formation Evaluation]
A measure of a material’s strength. The unconfined compressive strength (UCS) is the maximum axial compressive stress that a right-cylindrical sample of material can withstand under unconfined conditions—the confining stress is zero. It is also known as the uniaxial compressive strength of a material because the application of compressive stress is only along one axis—the longitudinal axis—of the sample.
Alternate Form: UCS, uniaxial compressive strength