A biaxial test device and test method for a uniaxial material testing machine

Abstract

The invention provides a bidirectional test device and a test method for a single-shaft material test machine. The bidirectional test device comprises a machine frame, two slide blocks and a measuring device, wherein the machine frame comprises two side frames in opposite arrangement; the two ends of the opposite sides of the two side frames are provided with relatively projected triangular end wings; the two slide blocks are movably fixed between the two side frames in a way of being clamped by the end wings arranged at the two ends of the two side frames; a space defined by the machine frame and the slide blocks is a test specimen installing space; the measuring device comprises measuring springs and displacement sensors; each measuring spring is arranged at one end, in contact with the slide block and the test specimen, of each side frame; the displacement sensors are used for detecting the displacement of the measuring springs. The bidirectional test device has the function of realizing bidirectional stretching and bidirectional compression on a single-axis material test machine; the loading synchronization problem is solved; meanwhile, the bidirectional test device can accurately measure the force and the displacement of the test specimen during the stretching and compression loading, so that an important stress-stress relationship curve during the material analysis can be given.

Description

technical field [0001] The invention relates to the field of material mechanics testing, in particular to a biaxial testing device capable of realizing biaxial tension and compression tests on a uniaxial material testing machine, and a testing method using the biaxial testing device. Background technique [0002] At present, the material testing machine for uniaxial tension and compression testing is the most widely used material testing machine, and the drive mode is motor drive or hydraulic drive. With different fixtures, this type of material testing machine can perform functions such as tension, compression, bending, and shearing. These tests are all based on uniaxial loading in one direction, and it is impossible to perform horizontal and vertical biaxial tension or biaxial compression tests at the same time. The price of a testing machine capable of achieving biaxial tension is relatively expensive, an order of magnitude higher than that of a uniaxial testing machine ...

AI Technical Summary

Problems solved by technology

[0003] At present, there have been many studies trying to achieve bidirectional loading tests with simple methods, but generally only one of bidirectional compression or tension can be achieved, and at the same time, the precise measurement is also very imperfect, and the accurate stress-strain relationship cannot be obtained directly. curve

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