Method for in situ performance test of all components in particle reinforced composite material

A particle-reinforced, composite material technology, applied in analytical materials, measuring devices, instruments, etc., can solve the problems of difficult analysis, unable to obtain quantitative conclusions, and unable to find effective judgment methods, and achieve the effect of improving experimental accuracy.

Active Publication Date: 2018-04-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is inaccurate in judging the position of the indentation, and it is necessary to compare images repeatedly for one indentation, which is difficult to analyze and the test efficiency is very low
[0010] Fourth, the conventional scratching method using a nanoindenter is to control the scratching process through the change of the normal phase force, which makes the scratching depths on different phases of particle reinforced composites different, that is, when scratching on different phases, the indenter The position relative to the sample is different, which makes it impossible to obtain the width of the interface phase by the criterion of contact mechanics
[0011] Fifth, the conventional particle-reinforced composite scratch method by nano-indentation instrument, the influence of base effect and peripheral effect, sample roughness, sub-surface damage caused by grinding and polishing, surface viscosity, protrusion or depression, etc. is not constant , the transition zone measured by non-constant depth scratches is difficult to analyze, and quantitative conclusions cannot be drawn
[0012] Sixth, the conventional scratch method is used to deal with circular phases. Parallel scratches will not be able to find an effective judgment method due to the irregular surface.

Method used

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  • Method for in situ performance test of all components in particle reinforced composite material

Examples

Experimental program
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example 1

[0024] Example 1 measures zirconia (ZrO 2 ) Particle-reinforced polymethyl methacrylate (PMMA) components in-situ elastic properties

[0025] Applying a test method for the in-situ performance of each component of particle-reinforced composite materials to obtain ZrO without the influence of peripheral effects 2 Particles enhance the in-situ elastic properties of PMMA components. First, use the optical microscope of the nano-indenter to locate a certain range including regular ZrO 2 The circular area of ​​the particle, the center point of the circular area is ZrO 2 Particle center, radius 50 microns. The P value of the feedback adjustment is 5000, the I value is 500, and the D value is 1000, and the change speed of the force during the adjustment is ±0.2 mN / s. The starting position of the scratch is the center of the circular area, the angle between adjacent scratch paths is 30°, a total of 12 lines, the pre-pressing depth is 2 microns, the pressing speed is 0.2 microns / sec...

example 2

[0026] Example 2 Measurement of silicon carbide (SiC) particle reinforced aluminum (Al) components in-situ elastic properties

[0027] Apply a test method for the in-situ performance of each component of particle-reinforced composite materials to obtain the in-situ elastic properties of SiC particle-reinforced Al components without the influence of peripheral effects. A circular area of ​​regular SiC particles, the center point of the circular area is the center of the SiC particle, and the radius is 100 microns. The P value of the feedback adjustment is 6000, the I value is 550, and the D value is 1000. The change speed of the force during the adjustment is ±0.3 mN / s. The starting position of the scratch is the center of the circular area, the angle between adjacent scratch paths is 30°, a total of 12 lines, the pre-pressing depth is 1 micron, the pressing speed is 0.2 micron / s, and the scratching speed is 4 micron / s. From the center along the radial direction, the SiC parti...

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Abstract

The invention discloses a method for in situ performance test of all components in a particle reinforced composite material, and belongs to the technical field of micro-nano mechanical test. The method comprises the following steps: inlaying, grinding and polishing the tested particle reinforced composite material to prepare a sample used for nano-indentation and nano-scratch; keeping a pressure head at a constant scratching depth through a feedback technology to complete a series of scratches; establishing the rectangular coordinate system of every scratch path with the center point of a circular area as a zero point, and importing the coordinates of acquisition points on the scratch paths into origin; and obtaining the positions of the starting point and the end point of every scratch boundary phase according to a contact mechanics judgment criterion, and sequentially connecting the starting points and the end points of the boundary phases to obtain the morphology of the boundary phases. The width of the boundary phase at a certain depth in a typical area can be effectively judged during the nano-indentation experiments of the micro-nanoscale material in order to obtain the in situ performances of all the components in the particle reinforced composite material, not affected by the circumference effects.

Description

technical field [0001] The invention discloses a method for testing the in-situ performance of each component of a particle-reinforced composite material, which belongs to the technical field of micro-nano mechanical testing, in particular a method for conducting experiments by means of a nano-indentation instrument. Background technique [0002] The interface between the particles and the reinforcing phase in particle reinforced composites is a riveted and irregular boundary, and the interfacial phase is often defined as this riveted region. Nanoindentation experiments in this region obtain the mechanical properties of the particle-reinforcement interaction phase, which is usually required to obtain the in-situ performance of one of the phases in the composite material. Since the observation means of the nanoindentation instrument is an optical microscope, when the width of the interface phase cannot be judged, the nanoindentation mechanical property test of the pure phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00
CPCG01N19/00
Inventor 杨庆生刘志远刘扶庆郭志明
Owner BEIJING UNIV OF TECH
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