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,,(,430070):,:;;:TG115.28;O241.82:A:100026656(2002)0620231203NUMERICALSIMULATIONOFEDDYCURRENTTESTINGBASEDONFINITEELEMENTMETHODSYOUFeng2he,CAOLing2jun,CHENTie2qun(WuhanUniversityofTechnology,Wuhan430070,China)Abstract:Finiteelementmethodwasappliedtoeddycurrentsignalsimulation,andthenewmethodcalledcolorcontourim2ageappliedbroadlyinmodernsciencevisualizationwasusedtoshowthecalculatingresults.Thedistributionofthecase2hardenedsectionofcementitematerialwasdescribedsimplyanddirectlybythemethod.Keywords:Eddycurrenttesting;Finiteelementmethod;Simulation,,,,;,[1],,,,,,,,[2]:2001204216,,[3,4]1,1.11,,F(ÛA)=kR125ÛA5r2+5ÛA5r+ÛAr2+113224620026NDTVol.24No.6Jun.2002©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.j2|ÛA|2-ÛJ1ÛArdrdz(1)ÛAÛJ11.2,,,1,ABCD,,ÛA(r,z)=1+2r+3z(2)1,2,3,CDAB,AC,BD,ÛA=01.3,F(ÛA)ÛA,5F(ÛA)5Ai=0i=1,2,3,,N(3)N,,,1.4,,,,,,2,,[2],,,,,,,ÛE=-jÛA(4)ÛB=ÛBr2+ÛBz2(5)ÛBr,ÛBzr,z,2.1,(4),(5),2,2,im,ii=mj=1jsjimj=1sji(6)jisjiji,(),,2.2,windowsRGB,,02553,,,2.3,,3232:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,3,19.3mm,63.6mm,3000,1581,Delphi,166,50s,4545,,,100Hz0.05A1.0mm(6,7)6,7,,(a)(b)6(a)(b)7(),,6a7a6b7b,,,,1119Hz,,,,1mmPmVmmPmV0.5560.8564.01.8543.5549.91.2553.4558.02.2537.6544.24,,(243)332:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,;,,,,xPBpBp=0NI2(ra-rb)h(x+h)lnrb+rb2+(x+h)2ra+ra2+(x+h)2-xlnrb+rb2+x2ra+ra2+x2ra,rb,hNI,,(,Bp2x),;,,,;(),;,,,,,;,,,,,,,11Pmm161,161.5,191,191.5,201,211240.7241,251,30132,38,42,44.53,,,[4,5]200121,2484,18;10700,51;612,15,10;,15,8,7[5],:[1],.600MW[J].,1998,20(5):284-285.[2].[J].,1999,(1):44-45.[3],.[R].:,1999.[4],.[R].:,1999.[5],,.[R].:,2001.(233),,,:[1],.[M].:,1984.[2],.[M].:,1995.[3],.[J].,2000,12(2):81-84.[4].[J].,1995,(1):47-51.342:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.