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Abstract：
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The whole process of hydraulic bulging of A3,20,45 and 406 steel is studied by means of acoustic emission technique.The data obtained show that there exist two yielding stages and two deformation shifts during the whole process of hydraulic bulging.The first yielidng occurs in the central zone within the die entrance,the second yielding occurs in the ring zone without the die entrance.The first shift takes place from the central zone within die entrance to the ring zone without conczave die entrance,the second shift takes place from the ring zone to the central zone.The bulging depth—acoustic emission count rate curve has two peak zones and two calm zones.The second calm zone foretells the damage of materials.
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Funds：
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内蒙古自治区自然科学基金
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AuthorIntro：
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Reference：
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1 Wangzhongrenetal.theHydrobulgingTechnologyofSphericalPres sureVessel.Proc.6thInt,Conf,Beijing,1 998,(2 ) :1 1 99
2 DavidADornfield .AcousticEmissionFromSimpleUpsettingofSolidCylinders.JournalofEngineeringandTechnology ,April,1 982 (1 0 4 ) .
3 KenichiYoshidaetal.SourceMechanaimofAcousticEmissionGen eratedaroundtheYieldPointAAl -Li -Cu -Mg -ZrAlloy .ProgressinAcousitcEmmissionⅣ ,TheJapaneseCocietyforNDT ,1 988;51 4
4 ZhuBaoquanetal.ResearchofApplicationonAcousticEmissionMethodinPlasticityTechnology .JournalofInnerMongoliaInstituteofTechnology ,1 987,6(2 ) :1 3
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