Test method for mechanical properties of small samples

Abstract

The invention provides a small sample mechanical property testing method which comprises the following steps: preparing and processing a micro-nano scale mechanical sample in a partial region of a macroscopic sample by utilizing a micro-nano processing technology, and ensuring that a clamping end of the micro-nano scale mechanical sample is connected with the macroscopic sample; loading the machined macroscopic sample through a mechanical testing instrument, the micro-nano scale mechanical sample is subjected to the action of force in the same direction as the loading direction of the macroscopic sample due to deformation of the macroscopic sample, and then testing the mechanical property of the micro-nano scale sample. According to the testing method, the micro-nano scale sample is connected with the macroscopic sample, and the macroscopic sample is loaded, so that the mechanical property of the micro-nano scale sample is tested by using macroscopic mechanical testing equipment such as a universal testing machine.

Description

technical field [0001] The invention relates to the field of mechanical property testing, and further relates to a small sample mechanical property testing method. Background technique [0002] The mechanical property test of small samples includes nano-indentation and tensile, compression, bending and other mechanical property tests of small-scale samples. This test technology can not only characterize the mechanical behavior of materials from the millimeter scale to the micron scale and nanoscale, but also realize the directional research on the specific microstructure in the material, such as the grain boundary and the second phase in the matrix, and then reveal the microscopic The influence mechanism of organizational structure on the macroscopic mechanical behavior of materials. Therefore, small sample mechanical property testing is widely used in advanced materials whose sample size is strictly limited by preparation conditions, such as two-dimensional materials, thin...

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Problems solved by technology

[0003] However, the current types of mechanical property tests for small samples are limited to indentation, compression, tensile and bending properties, and it is difficult to achieve fatigue tests that have important reference significance for engineering applications

Moreover, the current experimental technology can only achieve mechanical tests at room temperature, and it is difficult to test at different temperatures

At the same time, the mechanical performance test of small samples requires that the force and displacement sensors configured in the equipment have microscopic or even nanoscopic resolution and accuracy, and the micro-nano mechanical testing equipment that can achieve this index is expensive

In addition, the test also requires an effective connection between the sample and the micro-nano mechanical testing equipment. Therefore, it is necessary to use the focused ion beam to perform complex micro-nano processing on the sample and related components in the equipment, which increases the cost of the experiment.

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