Nanoindentation test desk and experimental method for interfacial shear force of carbon fiber composite

Abstract

A nanoindentation test desk and an experimental method for interfacial shear force of a carbon fiber composite belong to the technical field of experimental devices and methods. The nanoindentation test desk comprises a desk body and a pressing plate component, wherein a main desk body and a pressing plate are fixed in a normal direction to form a normal loading device. A convex part is arranged in the middle of the main desk body, and a circular hole is arranged at the center of the convex part. A convex part is arranged in the middle of the pressing plate, a circular hole is arranged at the center of the convex part, and the circular hole in the pressing plate is larger than that in the main desk body in diameter and is a through hole. A rubber layer gasket is placed at the bottom of the pressing plate and is a circle of which the center is provided with a circular hole, and the circular hole is aligned to the circular hole in the pressing plate. The test desk and the method realize testing for in situ interfacial mechanical property of an actual composite material without special manufacturing of an experimental sample, and accomplish monitoring for a whole single fiber pressing-out process; a fiber debonding process can be obtained through analysis of loading and unloading curves obtained in an experiment; and the test desk and the method achieve the control of bending of fibrous composite sheets in a press-in process.

Description

technical field [0001] The invention relates to a test bench, in particular to a nano-indentation test bench for testing the interface shear force performance of carbon fiber composite materials. The present invention also relates to a method for performing a nano-indentation experiment using the above test bench. The invention belongs to the technical field of experimental devices and methods. Background technique [0002] Nanoindentation is an experimental method for in situ determination of mechanical properties of real composite materials. Its experimental sampling comes from real materials, so the mechanical properties measured by this technique can truly characterize the mechanical behavior of actual composite materials. The interface is the decisive factor to characterize the performance of composite materials. A reasonable interface can improve the mechanical properties of composite materials. However, there is still no proper experimental method for testing the ...

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Problems solved by technology

However, if the round hole is set too large, the experimental results will be affected, because the thickness of the carbon fiber composite sheet is only 150 μm. When the round hole is large, the part of the composite material at the round hole will bend correspondingly during the loading process. The purpose of applying the load is to apply the phenomenon of debonding to a single fiber, which obviously violates the original intention of the experiment.

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