Multidirectional fretting wear device and testing method for heat transmission pipe of steam generator

Abstract

The invention provides a multidirectional fretting wear device and a testing method for a heat transmission pipe of a steam generator. The device is composed of a rack, a driving device, a leveling hoisting system and a data acquisition control system, wherein the structure of the test piece driving device is as follows: the upper end of a piezoelectric ceramic acting device is fixedly connected with a middle beam and the lower end of the piezoelectric ceramic acting device is connected with an upper clamp for clamping a block-shaped test piece sequentially via a flexible connector, a connection rod and a force sensor; a displacement sensor is mounted between the upper clamp and the middle beam; the structure of the leveling hoisting system of the heat transmission pipe is as follows: an angular displacement platform is fixedly arranged on a base and a hoisting platform is fixedly arranged on the angular displacement platform; a test piece supporting plate is mounted on the hoisting platform; two cylindrical test pieces which are the same in diameter are placed on the supporting plate and are close to each other; the outer sides of the cylindrical test pieces are close to clamping plates and the clamping plates are in threaded connection with lower pressing plates; the lower pressing plates are in tight fit with the cylindrical test pieces; the heat transmission pipe is placed in the two cylindrical test pieces. The device is simple in structure and easy to operate, can carry out a multidirectional fretting wear test on the heat transmission pipe, and can provide accurate, reliable and high-precision experimental data.

Description

technical field [0001] The invention belongs to a multi-directional compound fretting wear device specially applied to a heat transfer tube of a steam generator and a multi-directional compound fretting wear test method for a heat transfer tube of a steam generator. Background technique [0002] Fretting refers to the relative motion of extremely small amplitude (micron level) between two contact surfaces (such as tight fitting surfaces) under the action of alternating loads such as mechanical vibration, fatigue load, electromagnetic vibration or thermal cycle. The contacting surfaces are usually nominally stationary, i.e. fretting occurs in mechanical parts that are "tightly" fitted. [0003] The heat transfer tubes of steam generators in nuclear power plants transfer heat through the flow of high-temperature fluids. Due to the uneven flow rate and temperature of each part of the fluid, fretting and fretting wear will occur between the heat transfer tube and its supporting...

AI Technical Summary

Problems solved by technology

However, at present, there are no experimental equipment and test methods specially designed for nuclear power heat transfer tube fretting wear experiments, no basic experimental data accumulation of heat transfer tube fretting wear, corresponding wear mechanism models and life prediction models, which will inevitably restrict Integrity assessment and life prediction of steam generators, which affect the safe and reliable operation of nuclear power plants

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