Electromechanical impedance method-based portable hardness detection structure and detection method thereof

Abstract

The invention discloses an electromechanical impedance method-based portable hardness detection structure and a detection method thereof. The hardness detection structure disclosed by the invention comprises a hollow barrel, a support block, a limiting pipe, a piezoelectric bimorph beam, a needle tip and a penetrator, wherein deformation of the piezoelectric bimorph beam is a known value through a limiting pipe, so as to obtain stable known contact force. A strain gage or a stain measurement system for a response does not need to be used, and only a simple impedance analysis chip is needed, so that the measurement efficiency is accelerated; the measurement stability is improved; the weakness that an existing method cannot be used for ensuring the unstable contact force caused by interference in contact measurement is solved; the electromechanical impedance method-based portable hardness detection structure is efficient, reliable and easy to operate; and through miniaturization and instrumentation, the electromechanical impedance method-based portable hardness detection structure becomes a portable hardness measurement system, and is likely to apply to hardness test outside or in the industrial fields. Therefore, the electromechanical impedance method-based portable hardness detection structure 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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