METHOD TO DETECT MAXIMUM TRUE STRESSES AND DEFORMATIONS Russian patent published in 2014 - IPC G01N3/08 

FIELD: testing equipment.

SUBSTANCE: sample is stretched, deformation is recorded, as well as minimum diameter of the sample, longitudinal radius of the neck, using which they then define dependence of true stress on extent of true deformations by calculations, they determine true stresses corrected by impact of complex stressed condition by adding a correction coefficient of stress reduction and build a corrected true diagram of deformation. They detect maximum true deformation during rupture with account of impact of stiffness of stressed condition in the sample neck at the moment of rupture. They define the index of deformation strengthening by calculation-graphic method according to true diagram of deformation at the moment of sample rupture, and maximum true stresses are found with account of the produced value of the index of deformation strengthening, degree approximation of the true deformation diagram, maximum deformation, true stresses and deformations at the moment of sample rupture.

EFFECT: simplified method to define maximum true stresses and deformations due to exclusion of complicated procedures of multiple turning of a neck with preservation of validity of produced results.

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