METHODS AND INSTRUMENTS FOR RAPID NONDESTRUCTIVE EVALUATION OF THE MECHANICAL-PROPERTIES OF METAL FROM THE PARAMETERS OF IMPACT TESTS

Methods and instruments have been developed for quick nondestructive e valuation of the yield point and ultimate strength of metal on the bas is of impact-test parameters. The methods involve testing the metal by indentation with a spherical indenter to determine parameters charact erizing strain-hardening and hardness for specified values of contact deformation. It is shown that it is possible to use nondestructive mea ns to quantitatively evaluate yield point on the basis of hardness at the yield point and evaluate ultimate strength on the basis of hardnes s at the stress corresponding to the latter. Portable instruments have been developed for nondestructively evaluating the mechanical propert ies of metal directly in products. The areas of application of the met hods and instruments are discussed.