Medium-high strength titanium alloy cyclic loading test method

Abstract

The invention relates to the technical field of titanium alloys, in particular to a medium-high strength titanium alloy cyclic loading test method which comprises the following steps of: a, processing a required initial sample; b, placing the initial sample on a material testing machine for a compression loading test, displaying a load-displacement curve on matched software on the material testing machine, and converting the load-displacement curve into a stress-strain curve by a conversion formula; c, machining the compressed initial sample to obtain a tensile test piece; d, carrying out a tensile test on the obtained tensile test piece, and obtaining a stress-strain curve under the loading condition when a preset dependent variable is reached; and e, if the cyclic loading test needs to be further carried out, machining a compressed sample from the tensile test piece, continuing to carry out a compression test, and repeating the step c and the step d to finally achieve the needed cyclic loading test quantity. Accurate cyclic loading test data can be obtained by digital image related equipment, and the Bauschinger effect of a material can be conveniently researched.

Description

technical field [0001] The invention relates to the technical field of titanium alloys, in particular to a cyclic loading test method for medium and high-strength titanium alloys. Background technique [0002] Medium and high-strength titanium alloy is an advanced structural material widely used in shipbuilding, pressure vessels, aerospace and other fields. It has the advantages of high specific strength, good corrosion resistance, and high temperature performance. Titanium alloy components usually have an alternating loading process during service, and the material performance and changes of titanium alloy materials during cyclic loading are directly related to whether the component can complete the work. [0003] The Bauschinger effect of materials refers to the phenomenon that metal materials undergo a small amount of plastic deformation after preloading, and then load in the same direction after unloading, the specified residual stress increases; reverse loading, the spe...

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Problems solved by technology

[0004] When measuring the cyclic loading performance of titanium alloy materials, tensile loading tests are often easier to implement, but when performing reverse compression tests, compression instability often occurs, especially for plates. Before the level, the material sample was bent due to the instability of the pressure bar, so that the measured test data was not usable

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