Experimental method for measuring mechanical properties of metal by using indentation tester

Abstract

The invention provides an experimental method for measuring the mechanical properties of metal by using an indentation tester. A prepared sample is fixed after indentation test mechanical error measurement is completed; an indentation test is carried out on the metal or an alloy sample; a corresponding load-displacement value is converted into a true stress-true plastic strain data point through aformula; and the yield strength of a tested material is converted and the tensile strength of the tested material is estimated. According to the experimental method of the invention, the mechanicalproperty of the metal is measured by utilizing a nanoindentor, so that the true stress-true strain curve inertia, the yield strength and the engineering ultimate tensile strength of the metal material are obtained; the indentation tester is utilized to perform an automatic ball indentation test on the tested material, whole-process surveying and mapping are carried out on each loading and unloading cycle in a test process, so that a theoretical ideal value is avoided; an error compensation link is provided; and load-displacement data, a true stress-true strain curve, yield strength and engineering ultimate tensile strength of the tested material can be accurately and directly measured.

Description

technical field [0001] The invention relates to an experimental method for measuring the mechanical properties of metals by using an indenter, and belongs to the technical field of non-destructive mechanical experiments. Background technique [0002] The social economy and the rapid development of science and technology make people pay more and more attention to the safety of industrial production and equipment service. Therefore, the material inspection and life evaluation of industrial equipment have also become one of the focuses of people's attention. In order to accurately evaluate the remaining life of industrial equipment and test the performance of in-service equipment, it is necessary to grasp the changes in the mechanical properties of materials. However, in most cases, the traditional mechanical property test needs to destroy the sample, which means that the traditional mechanical property test method cannot evaluate the equipment in service online. Therefore, as...

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Problems solved by technology

[0004] The Chinese patent authorization announcement number is CN107860671A, which discloses a device and method for measuring the yield strength and strain hardening index of metal materials by indentation method. It loads the load through the servo motor, and performs repeated loading and unloading processes. When the indentation depth reaches the set total indentation depth, the loading is stopped, and the obtained load-displacement curve is composed of multiple loading and unloading cycle curves, but each unloading process is partially unloaded, and it is impossible to un...

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