Vibration Fatigue Test Device and Installation Method for Axial Variable Stress Ratio of Metal Materials

Abstract

The invention discloses a vibration fatigue test device for the axial variable stress ratio of metal materials, which comprises a frame bottom plate, a frame, a quality block, a sub-sample and a locking block, wherein the frame bottom plate is fixedly installed on a vibrating table, and the frame is installed on the frame On the bottom plate, a locking block is installed on the top of the frame, the auxiliary sample is installed vertically on the frame bottom plate, a mass block is installed on the upper end of the auxiliary sample, and the sample is installed between the mass block and the locking block; the frame is in an inverted U shape as a whole, The top of the inverted U is provided with an opening for installing the locking block; the two sides of the bottom of the inverted U are respectively connected to the bottom plate of the frame through the first screw; the appearance of the locking block is a T-shaped round table, and the outer edge of the upper part of the T-shaped round table is passed through the second screw It is connected with the frame; the T-shaped round platform is provided with a central hole, and a shoulder for fixing the sample is provided in the central hole. The invention has the function of changing the test stress ratio at the same time, realizes arbitrary adjustment of the stress ratio, and can realize the control of the test frequency by adjusting several parameters when facing different test frequency requirements.

Description

technical field [0001] The invention relates to a vibration fatigue test device, in particular to a vibration fatigue test device and an installation method of a metal material axial variable stress ratio. Background technique [0002] Fatigue failure is one of the typical failure modes of mechanical products. Fatigue failure may occur when components are subjected to certain low cyclic loads. [0003] At present, the method of estimating the fatigue life of parts is roughly as follows: first, analyze the load history of the parts; then, according to the Miner criterion, combined with the material S-N curve data obtained from the test and various correction parameters, calculate the fatigue damage of the parts within a certain period of time; finally, The estimated life of the part can be calculated from the fatigue damage. [0004] The acquisition of material S-N curves is generally achieved by performing fatigue tests on material samples on a fatigue testing machine. At ...

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Problems solved by technology

[0007] Aiming at the disadvantages in the prior art that the ordinary fatigue testing machine cannot reach the high-frequency output, and the test results have certain differences with the actual working life, the problem to be solved by the present invention is to provide a kind of lifting load frequency so that the test is the same as the actual working life. Vibration fatigue test device and its installation method for the axial variable stress ratio of metal materials required by the equivalence of conditions

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