Metal magnetic memory testing for early damage assessment in ferromagnetic materials

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1、万方数据V01．12Supple：，2J．CENT．SoUTHUNIV．TECHNOL．Oct．2005ArticleID：1005—9784(2005)S2—0102—05Metalmagneticmemorytestingforearlydamageassessmentinferromagneticmaterials刀DONGLi—hong(董丽虹)1’2，XUBimshi(徐滨士)2，DONGShi—yun(董世运)2，CHENQun-zhi(陈群志)3，WANGYu-ya(王愈涯)3，ZHANGLei(张蕾)3，WANG

2、Dan(王丹)1，YINDa-wei(尹大伟)1(1．NationalKeyLaboratoryforRemanufacturing，Beijing100072，China；2．OrdnanceEngineeringCollege，Shijiazhuang050003，China；3．BeijingAeronauticalTechnologyResearchCenter，Beijing100076，China)Abstract：Inordertoinvestigatethephysicalmechanismofmetalmagn

3、eticmemorytesting，boththeinfluencesofearthmagneticfieldandappliedstressonmagneticdomainstructurewerediscussed．StatictensionandfatiguetestsforlowcarbonsteelplatespecimenswerecarriedoutonhydraulicservotestingmachineofMTS810typeandmag-neticsignalsweremeasuredduringthepr

4、ocessesbythetypeofEMS-2003instrument．Theresultsindicatethattheinitialmagneticsignalsofspecimensaredifferentbeforeloading．Themagneticsignalscurvesaretransformedfrominitialrandomtoregularpatternduetotheeffectoftwotypesofloads．However。theshapeanddistributionofmagneticsi

5、gnalcurvesintheelasticregionaredifferentfromthatofplasticregionintensiontest．Whileinfatiguetestthosemagneticsignalscurvescorrespondingtodifferentcyclesaresimilar．TheHp(y)valueofmagneticsignalsonthefracturezoneincreasesdramaticallyatthebreakingtransienttimeandpositive

6、-negativemagneticpolesOccuronthetwopartsoffracturezone．Keywords：metalmagneticmemorytesting；ferromagneticmaterials；magneticleakagesignals；earlydamageCLCnumber：TGl15．28Documentcode：A1INTRODUCTIONManymilitaryequipmentsoftenmustbeservedunderthecircumstancesofhightempera—

7、ture，highspeedandcorrosionsurroundingswiththeirdevelopmenttohigherlevelofmechanizationandcommunication，whichrequestfortheirhigherquality[1'21．Somecomponentsofmilitaryequip—mentsaremadeofferromagneticmaterials，suchasthekeypartsinartillery，guidedmissile，aero—craft，ship

8、，armoredvehicleandspaceinstrumen—tation．Damagewouldoccuranddevelopinthesepartsundertheinfluenceofappliedloadandlcadtofailurefinally