대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제31권11호
  • /
  • Pages.1093-1099
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  • 2007
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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고온 고변형률속도에서 SM45C의 동적 거동

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

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

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.

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참고문헌

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피인용 문헌

  1. A Study on the Development of Impact Analysis Model of Roll Control System for Course Correction Munition vol.39, pp.8, 2015, https://doi.org/10.3795/KSME-A.2015.39.8.737