A portable hardness detection structure and detection method based on electromechanical impedance method

Abstract

The invention discloses a portable hardness detection structure and a detection method based on an electromechanical impedance method. The hardness testing structure of the present invention includes: a hollow cylinder, a support block, a limit tube, a piezoelectric twin crystal beam, a needle point and a hardness tester indenter; through the limit tube, the deformation of the piezoelectric twin crystal beam is a known value, and then A stable and known contact force can be obtained. The present invention does not require the use of strain gauges and responsive strain measurement systems, and only needs a simple impedance analysis chip, thus speeding up the measurement efficiency and improving the measurement stability; And the weak point that causes the contact force to be unstable; the present invention is efficient, reliable, and easy to operate. By making it miniaturized and instrumented, it becomes a portable hardness measurement system, which may be applied to hardness testing outdoors or on industrial sites. Therefore, the present invention The invention has a certain market application prospect.

Description

technical field [0001] The invention belongs to the field of material measurement and detection, and in particular relates to a portable hardness detection structure based on an electromechanical impedance method and a detection method thereof. Background technique [0002] The mechanical properties of materials refer to the mechanical behaviors of materials when they are subjected to various external forces and deformations. These mechanical behaviors can be described by mechanical models established by various mechanical parameters. Commonly used mechanical properties of materials include hardness, modulus, Poisson's ratio, and yield strength. Among them, hardness is an index widely used in the industry to measure the softness and hardness of materials, and it represents the ability of solid materials to resist local elastic-plastic invasion and destruction. [0003] Accurate determination of the hardness properties of materials is of great significance: first, accurate c...

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Problems solved by technology

[0006] However, there are certain problems in these existing hardness measurement methods: First, most of the existing hardness measurement methods need to use optical or geometric measurement systems to measure the residual deformation (Vickers hardness, etc.) or rebound height (dynamic hardness) of the material , these measurement methods cannot eliminate the errors caused by "sinking" and "extrusion" of the material, nor can they eliminate the errors caused by the fillet of the pit; secondly, the geometric measurement system is expensive, and the mass and volume are large, so It is not convenient for industrial promotion and use; in addition, the existing hardness measurement methods require manual measurement operations, which makes it difficult to form an automated hardness test at present, making it difficult to improve the efficiency of the current hardness test

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