Strain gage used for stress and strain state of the torsion test quantification

Abstract eng:
An original method for the strain, strain rate and stress intensity of the torsion test has been developed. This method replaces "classical" one - based on the Cauchy's geometrical equations. The method has been based on a considering of a fictive circle - which is thought on the surface of the cylindrical specimen. The circle transforms - due to straining - into fictive ellipse its major axis and minor axis serves for principal strains and stresses calculation. A strain gage is able to serve for the strain state quantification.

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