Translated Abstract
To some extent,the metal parts will exist the residual stress in the machining process,which are casting,cutting,welding,heat treatment.Because of residual stress existing,the metal parts may crack for some time,or momentary crack.Residual stress testing is important for insuring the metal parts security and reliability. With the rapid development of science technology, the design conception and the design code for significant structural components are gradually changing. For load designing, not only working load effect is required to be considered, the effect of residual stress also need to be considered.First of all,we must test and analyse the residual stress in the metal parts,getting the information of distributing and amount residual stress of manufacture ,finally,making the performance of the manfacture accord with the demand of design and service.
In the current,many measurements of non-destructive testing residual stress are root of non-destructive examination faults.Whether we can find a new measurement for residual stress,it is a key of overlapping for non-destructive examination and residual stress. In this paper, it is proposed for residual stress measurement and testing technology by eddy current to determine residual stresses.We resolve the lift-off effect from utilizing the restrain lift-off model for the residual stress measure.In the range of penetrating depth,the parameter of the model can reaction with the mechanics of the metal parts.
From the results of experiment restrain lift-off effect model,it is proved the parameter of the model can describe mechanics signal.All this can account for eddy current testing residual stress feasibility and validity.The characteristic of the eddy current are non-destructive,esay handle,high resolving power,describing the mechanics signal.This paper resolves the problem of lift-off effect,make a model to restrain the lift-off effect.It is contribute to carry this eddy current testing residual stress measurement for practise.
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