A preloaded high-frequency vibration fatigue test device

Abstract

The invention discloses a preloaded high-frequency vibration fatigue testing device, which comprises a sample and a clamp, wherein the sample is strip-shaped, and comprises a test section located in the middle and holding sections at two ends of the test section; two studs are connected to ends of the holding sections respectively; the clamp comprises a clamp base and two clamping blocks; the clamp base is mounted on a connecting plate of an electric vibration table, and is fixedly connected to the connecting plate through a plurality of second bolts; two clamping grooves are formed in two ends of the clamp base respectively; the opening width of the clamping grooves is smaller than the width of the holding sections of the sample; the studs at the two ends of the sample are respectively inserted into the two clamping grooves in a clamped manner; nuts are mounted at ends of the studs; the outer diameter of the nuts is larger than the opening width of the clamping grooves; the two clamping blocks are respectively pressed on the two clamping grooves, and are fixed with the clamp base through a plurality of first bolts. According to the invention, the problem in applying an average stress in a vibration table-based high-frequency fatigue test system is effectively solved.

Description

technical field [0001] The invention relates to a preload high-frequency vibration fatigue test device, belonging to the field of material and structure fatigue tests. Background technique [0002] With the continuous improvement of modern industry's requirements for the safety, reliability and economy of gas turbine engines, the source, mechanism, prevention and maintenance of faults have long been the subject of continuous and in-depth research by scientific researchers. High cycle fatigue failure is a prominent issue in the structural integrity of modern gas turbine engines. During the working process of the gas turbine engine, the high-speed rotating fan, compressor and turbine blades not only bear the huge centrifugal force load, but also bear the high-frequency vibration load caused by the forced vibration of the airflow. Airflow excitation leads to vibratory load frequencies on the blades even exceeding 1000 Hz with cycles up to 10 7 The cycle is even higher, so tha...

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of preload high-frequency vibration fatigue test device, to solve the problem of applying average stress in the high-frequency fatigue test system based on the shaking table

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