Testing device for warping fatigue test of magnetic shield plate

Abstract

The invention provides a testing device for a warping fatigue test of a magnetic shield plate. The testing device for the warping fatigue test of the magnetic shield plate comprises an upper base, a lower base, a fixing ring and a vertical displacement limiting block, wherein the lower base is arranged below the upper base; the fixing ring is configured to be connected with the lower base and is used for fixing the magnetic shield plate; and the vertical displacement limiting block is configured to be connected with the upper base and is used for limiting displacement of the magnetic shield plate. Compared with the prior art by which a destruction process of the magnetic shield plate under actual working conditions cannot be observed, the testing device for the warping fatigue test of the magnetic shield plate has the advantages that the fatigue destruction process of the magnetic shield plate can be observed, fatigue performance can be tested and the fatigue service life of the magnetic shield plate can be estimated on the basis of concrete analysis of the destruction cause of the magnetic shield plate.

Description

technical field [0001] The invention relates to the field of nuclear power engineering, in particular to a test device for warping fatigue test of a magnetic spacer in a drive mechanism of a control rod of a nuclear power plant and a warpage fatigue test of a magnetic spacer for life evaluation of the magnetic spacer. Background technique [0002] The AP1000 Control Rod Drive Mechanism (CRDM) is an electromagnetically actuated mechanical device. In PWRs, the role of the control rod drive mechanism is to position the control rod assembly in the vertical direction. The control rod drive mechanism changes or maintains the vertical height of the control rod assembly to realize the start and stop of the nuclear reactor, adjust or maintain the power level of the core during normal operation of the reactor, and quickly shut down the reactor under accident conditions. It is one of the key equipment that directly affects the normal operation, safety and reliability of the reactor. ...

AI Technical Summary

Problems solved by technology

[0003] However, since the control rod driving mechanism is a closed cavity as a whole, it is impossible to directly detect the loading state and damage of the magnetic isolation sheet in its working state. After specific analysis in the early stage, it is found that the main cause of damage to the magnetic isolation sheet is the wear of the reciprocating action The action surface of the armature and the magnetic isolation piece evolves into a miniature arc surface, resulting in local stress concentration when the armature impacts the magnetic isolation piece, and a large tensile stress and warpage are generated on the lower surface of the magnetic isolation piece. Warpage fatigue occurs during periodic impact and eventually fails, so it is necessary to design a specially designed test device for warpage fatigue testing to observe the fatigue damage phenomenon of the magnetic isolation sheet and directly test the fatigue performance of the magnetic isolation sheet. Prediction of Fatigue Life of Magnetic Spacers

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