Fatigue test fixing device for composite material pipe

Abstract

The invention provides a fatigue test fixing device for a composite pipe. The fixing device comprises a base, and buckling connectors for fixing an experimental composite pipe sample is arranged on the base; eachbuckling connector comprises an upper adapter flange, a lower adapter flange, an upper inner core, a lower inner core, an upper outer sleeve and a lower outer sleeve. The upper end and thelower end of the experimental composite pipe sample are provided with buckling connectors, the buckling connector at the upper end comprises an upper adapter flange fixedly connected with a loading device, the lower face of the upper adapter flange is fixedly connected with the upper inner core, and the upper inner core is sleeved with an upper outer sleeve. The buckling connectorat the lower endcomprises a lower adapter flange fixedly connected with the base, the upper surface of the lower adapter flange is fixedly connected with a lower inner core, and a lower outer sleeve is sleeved on the lower inner core; and the two ends for fixing the experimental composite pipe sample are respectively sleeved in the upper outer sleeve and the lower outer sleeve. Initial damage to the sample is small.

Description

technical field [0001] The invention relates to the technical field of material mechanics test equipment, in particular to a fatigue test fixture for composite material pipes. Background technique [0002] Material fatigue failure refers to the phenomenon that the material is damaged or fails after a certain cycle period under the action of alternating stress. Fatigue failure is a delayed failure caused by cyclic stress, and the stress level at the time of failure is often lower than the tensile strength of the material, or even lower than the yield strength of the material. The fatigue life of a material is related to the cyclic stress it suffers. The higher the stress level, the shorter the life, and the lower the stress level, the longer the life. When the stress suffered by the material is less than the fatigue strength of the material, its life can be infinitely long. The way to obtain the fatigue performance of a new material is to carry out fatigue tests on the mater...

AI Technical Summary

Problems solved by technology

Since the physical sample of the composite material pipe is tubular, and the traditional fixture is only for the fatigue test of the sheet sample, it is difficult to apply to the fatigue test of the tubular sample

If a composite pipe sample is fixed with a traditional fixture, it cannot meet the basic fatigue test requirements (the sample will slip off and be pinched), and it needs to apply a larger cyclic load than the traditional standard sample, so the traditional fixture is not suitable. Can meet the fatigue test requirements of composite pipes

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