Nano-indentation technology-based method for studying boundary phase of composite material

Abstract

The invention discloses a mano-indentation technology-based method for studying the boundary phase of a composite material, and belongs to the technical field of micro-nano mechanics test. The methodcomprises the following steps: marking the starting point and the end point of the boundary phase in a two-dimensional map in a three-dimensional map, performing click to automatically generate a vertical face which passes through the adjacent starting points and is perpendicular to the horizontal plane of the space coordinate system in the three-dimensional map to obtain an intersection line 1 between the vertical face passing through the adjacent starting points and the three-dimensional map, and carrying out same steps to obtain an intersection line 2 between the vertical face passing through the adjacent end points and a map 2; reserving the three-dimensional map between the intersection line 1 and the intersection line 2, and observing the three-dimensional morphology of the boundaryphase of the composite material; removing the three-dimensional map between the intersection line 1 and the intersection line 2, carrying out indentation experiments with the pressed depth being lessthan the scratch depth at the center position of the adjacent scratches at the left side of the connecting line of the starting points, and measuring the mechanical properties of a reinforced phase atthe micro-nano scale; and carrying out indentation experiments with the pressed depth being less than the scratch depth at the center position of the adjacent scratches at the right side of the connecting line of the end points, and measuring the micro-nano scale mechanical properties of a matrix.

Description

technical field [0001] The invention relates to a method for researching composite material interface phases based on nano-indentation technology, and belongs to the technical field of micro-nano mechanical testing, in particular to a method for conducting experiments through a nano-indentation instrument. Background technique [0002] The interface between the reinforcement phase and the matrix in composite materials is a riveted, irregular boundary, and the interfacial phase is often defined as this riveted region. The nanoindentation experiment in this area obtains the mechanical properties under the interaction between the reinforcing phase and the matrix, and the experiment usually needs to obtain the properties 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 is ofte...

AI Technical Summary

Problems solved by technology

This method is inaccurate in judging the position of the indenter, and needs to compare images repeatedly for an indentation, making analysis difficult and testing efficiency very low

[0009] Fourth, the conventional scratching method by nanoindenter is to control the scratching process through the change of normal phase force, which makes the depth of scratches on different phases of composite materials different, that is, when scratching on different phases, the indenter and test The relative positions of the phases are different, which makes it impossible to obtain the width of the interface phase by the criterion of contact mechanics

[0010] Fifth, in the conventional method of scratching composite materials by nano-indentation instrument, the effects of base effect and peripheral effect, sample roughness, sub-surface damage caused by grinding and polishing, surface viscosity, protrusion or depression are not constant. The transition zone measured by non-constant depth scratches is difficult to analyze, and quantitative conclusions cannot be obtained

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