A multi-axis non-proportional fatigue test system based on centrifugal loading

Abstract

The invention relates to a multi-axis non-proportional fatigue test system based on centrifugal loading. The multi-axis non-proportional fatigue test system comprises a load sensor, a centrifugal multi-axis non-proportional loading part and a fatigue sample, wherein the centrifugal multi-axis non-proportional loading part comprises a rotating loading cross bar, a loading support and a clamp component; the rotating loading cross bar is arranged on the loading support through a bearing; a left eccentric mechanism and a right eccentric mechanism are respectively fixed at the two ends of the rotating loading cross bar; the loading support is located between the left eccentric mechanism and the right eccentric mechanism; the clamp component comprises an upper clamp and a lower clamp; the loading support is fixed to the upper clamp and is used for driving the upper clamp to apply a multi-axis non-proportional fatigue load to the fatigue sample when the rotating loading cross bar is rotated.The device is used for applying the multi-axis non-proportional fatigue load in the manner of centrifugal force, can overcome the defect of difficulty in applying the combined loads, such as, non-proportional tensile pulling-bending and bending-torsion of the present multi-axis non-proportional fatigue test system and supplies an effective test method for researching the material fatigue performance under a complex loading condition.

Description

technical field [0001] The invention belongs to the technical field of material testing, in particular to a multi-axis non-proportional fatigue test system based on centrifugal loading. Background technique [0002] In practical applications, many engineering components and mechanical parts are subjected to multi-axial cyclic loads. For example, the crank bearings of reciprocating compressors and reciprocating pumps are subjected to the combined action of time-varying bending moments and torques from the drive equipment and connecting rods, and the automobile drive shaft is subjected to the combined action of shear stress caused by torque and axial stress caused by bending , the effect of wind-induced fatigue load and changing internal pressure of towering tower equipment, and the effect of vortex-induced vibration and fluctuating internal pressure induced by ocean currents on submarine pipelines. Fatigue is one of its most common failure modes. Although the research on fa...

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Problems solved by technology

[0003] The current commercialized fatigue testing machines mainly adopt axial loading, rotational bending loading, etc., although some of them can achieve combined tension-compression-torsion loading, but it is still difficult to meet non-proportional tension-compression-bending, bending-torsion and other multi-axial fatigue tests. There is an urgent need to develop a corresponding multiaxial fatigue test system to provide an effective test method for the research on the fatigue performance of materials under complex loading conditions.

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