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How believable are published laboratory data?A deeper look into system-compliance and elastic modulus

Journal of rock Mechanics and Geotechnical Engineering 2021年第3期13卷 487-499页

作者： Aly Abdelaziz Giovanni Grasselli Department of Civil and Mineral Engineering University of Toronto35 St.George StreetTorontoOntarioM5S 1A4Canada

Elastic modulus(E)interpretation is debatable with limited literature detailing the impact of *** address this impact,a comprehensive testing schedule using an aluminium 6061(Al)sample is carried out on several systems under various test *** is chosen as it is extruded and adheres to well defined shape tolerances and elastic properties.A robust method,using the Savitzky-Golay filter,is introduced to identify significant slope changes in the stressestrain *** the load in the test system is well defined,the recorded deformation is corrected to the expected value of Al resulting in a system-compliance *** results across the testing systems and test setups showed significant variance,with the recorded E always lower than the anticipated *** number of components within the system over which the deformation is measured had the most significant impact,lowering the expected E by up to 50%.Additionally,the system-compliance factor is inconsistent across different systems and ***,it is evidently proved that each setup must be separately evaluated for its system-compliance and that no single value exists across systems and *** findings are then projected onto a series of uniaxial compressive strength(UCS)tests carried out on Stanstead granite(SS GR)*** corrected Et50 and Eavg values for system-compliance of the samples are within1%for each system as opposed to being50%*** findings conclude that it is deemed necessary and of utmost importance that the deformation be corrected to accommodate the systemcompliance to obtain reliable results.

关键词： System-compliance Elastic modulus Stressestrain compressive strength of rock

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