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JOURNALOFMATERIALSPROCESSINGTECHNOLOGY1702005181–186STAMPINGFORMABILITYOFPURETITANIUMSHEETSFUHKUOCHEN∗,KUANHUACHIUDEPARTMENTOFMECHANICALENGINEERING,NATIONALTAIWANUNIVERSITY,TAIPEI10764,TAIWAN,ROCRECEIVED20OCTOBER2003；RECEIVEDINREVISEDFORM12APRIL2005；ACCEPTED4MAY2005ABSTRACTBECAUSEOFHEXAGONALCLOSEPACKEDHCPCRYSTALSTRUCTURES,COMMERCIALLYPURETITANIUMCPTISHOWSLOWDUCTILITYATROOMTEMPERATURE,ANDREQUIRESTHERMALACTIVATIONTOINCREASEITSDUCTILITYANDFORMABILITYINTHEPRESENTSTUDY,THEFORMABILITYOFCPTISHEETSATVARIOUSTEMPERATURESWASSTUDIEDBYTHEEXPERIMENTALAPPROACHTENSILETESTSWEREFIRSTCONDUCTEDTOINVESTIGATETHEMECHANICALBEHAVIOROFCPTISHEETSATVARIOUSTEMPERATURESFORMINGLIMITTESTS,VBENDTESTS,ANDCUPDRAWINGTESTSWEREALSOPERFORMEDTOEXAMINETHESTAMPINGFORMABILITYOFCPTISHEETSATVARIOUSTEMPERATURESTHEEXPERIMENTALRESULTSINDICATETHATCPTISHEETSCOULDBEFORMEDINTOSHALLOWCOMPONENTSATROOMTEMPERATURE,ALTHOUGHTHEFORMABILITYISLIMITEDINCOLDFORMINGINADDITION,THERESULTSOBTAINEDFROMTHEVBENDTESTSREVEALTHATSPRINGBACKCANBEREDUCEDATELEV
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