Mechanical-thermal coupling fatigue testing device for in-situ analysis of infrared spectrometer

Abstract

The invention belongs to the field of material mechanical property testing, and discloses a mechanical-thermal coupling fatigue testing device for in-situ analysis of an infrared spectrometer, which mainly comprises a structural body, and a mechanical loading unit, a data acquisition unit and an environment loading unit arranged in the structural body, wherein the mechanical loading unit comprisesa motor, three belt wheels, two conveying belts, two lead screws, a nut ejector block, two cross beams and two clamp sets; the data acquisition unit comprises a grating ruler, a reading head and a load sensor; the environment loading unit comprises an air inlet, a humidity sensor, an environment box upper cover plate and a temperature and humidity environment box. The device can be installed in instruments such as a Fourier infrared spectrometer and a polarizing microscope, in-situ component analysis and microstructure characterization of the material in the mechanical property testing process are achieved, and the component change rule and failure behaviors in the material fatigue test are analyzed; and the temperature and humidity of the sample environment can be regulated and controlled on line, a mechanical-thermal-humidity coupling loading environment is realized, and deep research on chemical components and structures of materials is met.

Description

technical field [0001] The invention belongs to the field of testing mechanical properties of materials, and in particular relates to a miniature fatigue test device. Background technique [0002] At present, Fourier transform infrared spectroscopy has become the main means of analyzing the chemical composition of materials by studying the structure and chemical bonds of molecules. The use of infrared spectrometers for qualitative analysis of materials has been widely used in research fields such as biology, materials science and polymer chemistry. . It is of great research value to combine material mechanics testing and infrared spectroscopy to analyze the structure and composition of materials. Dynamic infrared spectroscopy technology refers to putting a small stretching machine into the infrared spectroscopy sample pool to obtain the molecular structure and orientation changes of the material at each moment under the action of stress. This technique is very important for...

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Problems solved by technology

[0003] 1. At present, the in-situ mechanical test device developed for dynamic infrared spectrometer can only perform tensile test, but it is also very important for the analysis of structural composition change law and failure behavior of materials in fatigue test, while uniaxial tension and compression fatigue test The machine is mostly realized by hydraulic system or gear transmission, with large volume and obvious backlash. The dynamic infrared spectroscopy test device integrating tensile, compression, shearing, fatigue and other mechanical performance tests needs to be developed;

[0004] 2. The existing mechanical loading device for infrared spectrometer can only realize temperature control, and the influence of humidity on most polymer film materials cannot be ignored. Research in humidity environment;

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