Low-temperature in-situ biaxial tensile mechanical property testing device

Abstract

The invention relates to a low-temperature in-situ biaxial tensile mechanical property testing device and belongs to the field of mechanical property testing. A vertical structure is adopted, a stepper motor is connected with a precision ball screw through a coupling, rotation of a motor is converted into precise linear movement of a moving plate through transmission of a screw rod nut, and furthermore synchronous biaxial tensile loading of an X axis and a Y axis is achieved. A temperature loading module is refrigerated by using a semiconductor refrigerator, the temperature variation range is0-30 DEG C, and biaxial tensile mechanical property testing on a material under a temperature-variable condition is achieved. Together with an optical microscope, in-situ dynamic monitoring on micromechanical behaviors and damage mechanisms of test parts is implemented in the testing process. The device has the advantages that real service states of a material can be simulated, and the testing device is compact in structure, small in floor space and convenient to integrate and control and has great significances for mechanical property testing and research on materials at complex stress statesin low-temperature environments.

Description

technical field [0001] The invention relates to the field of precision scientific instruments in the field of testing the microscopic mechanical properties of materials, in particular to a low-temperature in-situ biaxial tensile mechanical property testing device. It can accurately test the mechanical behavior, damage mechanism and performance weakening law of materials under synchronous biaxial tension under low temperature conditions. Background technique [0002] The mechanical properties of materials are an important basis for the design and calculation of the main indicators for evaluating its quality and performance. The traditional method of testing the mechanical properties of materials is the test of simple stress states, such as tension, compression and torsion. However, in the actual service state, usually the material is not only subjected to a single load. However, the traditional material mechanical performance testing technology is only measured under a singl...

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Problems solved by technology

[0004] At present, due to the large mechanical structure of the well-applied biaxial tension and compression test system, it is not compatible with the microscope imaging equipment, and it is difficult to provide in-situ monitoring means during the load test. There is a lack of effective research on the micromechanical behavior and damage mechanism under load; there are few existing in-situ biaxial test devices that can provide functions under different temperature environments

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