Biaxial tensile mechanical property testing device and method for multi-configuration test piece

Abstract

The invention provides a biaxial tensile mechanical property testing device and method for a multi-configuration test piece, relates to the technical field of material mechanical property tests under complex stress loading, and particularly relates to the biaxial tensile mechanical property testing device and method for the multi-configuration test piece. The device comprises an upper clamp and a lower clamp which are connected with a testing machine and correspondingly arranged vertically. The upper clamp comprises an upper clamp body of an orthogonal cross structure, four extension arms of the upper clamp body are upper supporting arms, the center lines of the four upper supporting arms are located in the same plane, an upper clamping part used for being connected with the testing machine is fixedly arranged at the center of the upper clamp body, and the upper clamping part extends out in the direction away from the lower clamp. The biaxial stretching mechanical property testing device is high in universality, the number of testing devices needed for adapting to biaxial stretching mechanical property tests of test pieces of different configurations is reduced, cost is saved, and the requirement for the biaxial stretching mechanical property tests of the test pieces of different configurations and sizes can be met by adjusting the included angle formed by the supporting rod and the base.

Description

technical field [0001] The invention relates to the technical field of material mechanical performance testing under complex stress loading, in particular to a biaxial tensile mechanical performance testing device and method for a multi-configuration test piece. Background technique [0002] At present, conventional quasi-static material testing machines and Hopkinson rods are usually used to carry out uniaxial mechanical performance tests of materials under different speed and temperature conditions. However, in practical engineering applications, structural parts are usually in complex stress states such as biaxial loading. Moreover, the mechanical properties of most materials are obviously affected by factors such as stress state and ambient temperature. Therefore, the failure criteria and failure criteria established only based on uniaxial mechanical performance tests cannot truly and effectively evaluate the failure conditions or service life of most structural compone...

AI Technical Summary

Problems solved by technology

However, this device has the following disadvantages: First, the maximum loading rate of this type of device is usually lower than 500mm / min, which cannot meet the needs of research on the mechanical properties of materials under dynamic biaxial loading; secondly, this type of device is usually not equipped with a suitable temperature box And the temperature control device, and the transformation cost is high, that is, it cannot meet the needs of the research on the mechanical properties of materials under biaxial loading at different temperatures; third, this type of device is usually large in size and heavy in weight, and the cost of construction and handling and maintenance costs higher

Therefore, the above shortcomings seriously limit the application of this type of device in the experimental research of the mechanical properties of materials under biaxial loading.

[0004] In order to study the mechanical properties of materials under biaxial loading, it is usually necessary to design a suitable test piece configuration according to the properties of different materials and the loading characteristics of the testing machine or test device, that is, the configuration size of the biaxial loading test pieces of different materials The difference is large, and the connection methods between the test piece and the testing machine are also different; secondly, compared with the compressive load, the material is more prone to deformation and failure under tensile loading

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