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Dynamic Behavior of SM45C at High Strain-rate and High Temperature

고온 고변형률속도에서 SM45C의 동적 거동

  • 양현모 (연세대학교 대학원 기계공학과) ;
  • 민옥기 (연세대학교 기계공학부)
  • Published : 2007.11.01

Abstract

A compressive split Hopkinson pressure bar (SHPB) technique is used to investigate the dynamic behavior of SM45C at high temperature. A radiant heater, which consists of one ellipsoidal reflector and one halogen lamp, is used to heat the specimen. Specimens are tested from $600^{\circ}C$ to $1000^{\circ}C$ at intervals of $100^{\circ}C$ at a strain-rate ranging from 1100/s to 1150/s. A critical phenomenon occurs between $700^{\circ}C$ and $750^{\circ}C$ in SM45C. This phenomenon results in the drastic drop in a flow stress. In a modified Johnson-Cook constitutive equation, a reducer function is used to take into account for the effect of the drastic drop in a flow stress. A reducer function, which is dependant on the temperature as well as the strain, is introduced and the parameters of the modified Johnson-Cook constitutive equation are determined from test results.

Keywords

Dynamic Behavior;SHPB;High Strain-rate

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