In-situ three-point bending test platform for material mechanical properties with adjustable test environment temperature

Abstract

The invention relates to a material mechanical property in-situ three-point bending test platform with adjustable test environment temperature, and belongs to the field of in-situ mechanical property test. Test elements are heated up through resistance wires, and are observed by combining with a high-amplification-factor solid state CCD (charge coupled device) industrial imaging lens, and the microstructure variation as well as micromechanics behaviors of crack production, expanding and the like of materials at different environment temperatures under the bending load effect can be monitored dynamically. The material mechanical property in-situ three-point bending test platform with adjustable test environment temperature provided by the invention mainly comprises a precision driving transmission unit, a detecting unit, an imaging system unit, a temperature field control unit and an auxiliary support unit. The material mechanical property in-situ three-point bending test platform with adjustable test environment temperature has the advantages that the structure is simple and compact, the transmission is stable, and a temperature field and stress field are effectively combined, in-situ observation can be carried out on micro deformation, damage and cracking process of materials under a high-resolution imaging system, and thus a novel test method is provided for revealing the mechanical property and the damage mechanism of materials under different temperature fields.

Description

technical field [0001] The invention relates to the field of in-situ mechanical property testing, and relates to an in-situ three-point bending test platform for material mechanical properties with adjustable test environment temperature. In different temperature fields, the high-magnification solid-state CCD industrial imaging system can be used to dynamically observe the microstructure, lattice changes, crack initiation, expansion and fracture of the test material in real time. The mechanical property testing device provides a brand-new method for testing the mechanical properties of materials based on the temperature field. Background technique [0002] In-situ mechanical performance testing refers to the process of testing the mechanical properties of specimen materials at the micro / nano scale. Microscopic imaging systems such as atomic force microscopes, electron microscopes, and optical microscopes can be used to analyze the microscopic properties of materials under va...

AI Technical Summary

Problems solved by technology

However, traditional bending testing machines are mostly aimed at large-scale test pieces at room temperature, and do not involve the study of the mechanical properties of samples in the micro-nano scale, nor do they consider the influence of the temperature field on material properties, and most of them belong to off-site tests. In situ observation to the corresponding microscopic imaging system

The current development of in-situ test devices mainly has the following characteristics: (1) In terms of the compatibility between the test device and the imaging system, due to the limited cavity space of scanning electron microscopes, transmission electron microscopes and atomic force microscopes, so far Most of the research is focused on the simple in-situ nano-tensile testing of extremely small structures such as nanotubes, nanowires, and thin-film materials based on the principles of micro / nano-electromechanical systems. In-depth research on in-situ micro / nano mechanical performance testing; (2) From the perspective of test accuracy, it mainly focuses on the research and development of the reliability and stability of the micro-drive system, the precise measurement method of the load displacement signal, and the processing and clamping of the sample , for medium problems

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