A high-precision instrumented indenter and a method for calculating the indentation depth of a diamond indenter

Abstract

The invention discloses a design of an instrumented indenter. A driving and load testing system adopts a design that a voice-coil linear motor is connected in series with a load sensor and an indenting head subassembly; an indenting-in-sample depth testing system for a diamond indenting head adopts a design that three probe type capacitor displacement sensors are combined with a depth measuring follow-up disc; a computer control system is designed to have an open-loop working mode and a closed-loop working mode according to different test progresses, and can control the voice-coil motor, so as to control the diamond indenting head to carry out tests of indenting loading, load keeping, unloading and the like on the surface of a sample; and simultaneously, the relationship of an indenting load, an indenting depth and time can be obtained. By using the design, the influence on the measurement of an indenting-in-sample depth of the indenting head as the surface of the sample generates small-angle inclination with respect to a horizontal plane and the surface of the sample generates transitional displacement along a vertical direction due to a supporting factor or a clamping factor in a process that the sample is indented is eliminated; simultaneously, the influence of the flexibility of a frame on the measurement of the indenting-in-sample depth of the indenting head is also eliminated; and the precision of the indenting-in-sample depth of a testing indenting head is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of testing mechanical properties of materials. In particular, it relates to the design of a high-precision instrumented indenter. Background technique [0002] With the rapid development of surface modification materials, thin film materials, MEMS (microelectronic micromechanical system) materials, composite materials, nanomaterials and other fields, the working reliability of surface, interface and microscale materials is challenged by harsh working conditions. It has drawn more and more people's attention and has become a research hotspot at home and abroad. However, due to the limitation of size, the traditional testing techniques and methods for mechanical properties of materials can no longer meet the needs of testing the mechanical properties of the above-mentioned materials, making the testing of the mechanical properties of material micro-regions become a key problem to be solved urgently. [0003]...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-precision instrumented indenter and a calculation method for the depth of the diamond indenter indented into the sample, s

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