서지주요정보
박판금속의 단열 전단밴드 생성에 대한 실험 및 유한요소 해석 = Experiment and finite element analysis of the formation of adiabatic shear band in sheet metal
서명 / 저자 박판금속의 단열 전단밴드 생성에 대한 실험 및 유한요소 해석 = Experiment and finite element analysis of the formation of adiabatic shear band in sheet metal / 임지호.
저자명 임지호 ; Lim, Ji-Ho
발행사항 [대전 : 한국과학기술원, 2000].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8010890

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 00065

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The adiabatic shear band formation is one of the high speed deformation phenomena, in which adiabatic shear failure is physically observed as a narrow band of the continuous shear strain. The localized shear strain is generally of a magnitude far higher than the material would normally be expected to sustain without fracture. The adiabatic shear band plays a significant role in the area of high speed rotor, high speed forming, high speed machining and penetration of a target by a projectile. In this study, the experiment and finite element analysis of the formation of an adiabatic shear band in sheet metal are carried out for high strength steel sheet 60C and 60TRIP. In order to carry out experiments with a tension split Hopkinson bar, shear specimens are designed to induce large shear strains. The shear deformation of the two sheet metals of 60TRIP and 60C is quite different and the adiabatic shear band is observed with 60C only. The width of a shear band is measured by comparison of the hardness in a crack tip. The shear deformation in 60TRIP is restrained and the crack is propagated by a tensile mode since the strain hardening of 60TRIP in the high strain rate is large. The load-displacement curves show that the load with 60TRIP becomes higher than that with 60C as the displacement increases. Numerical simulations are carried out with an elasto-plastic explicit finite element method. In order to integrate the Johnson-Cook constitutive equation over a time step, the plastic predictor-elastic corrector (PPEC) method is used. The stress could be accurately calculated in a single step with no iteration. For the numerical integration, the reduced integration scheme is used to reduce the computation time and eliminate the locking problem. An assumed strain method is used to control the hourglass mode. The shear localization calculated from the numerical simulation shows similar behavior to experimental results.

서지기타정보

서지기타정보
청구기호 {MME 00065
형태사항 xii, 89 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Ji-Ho Lim
지도교수의 한글표기 : 허훈
지도교수의 영문표기 : Hoon Huh
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 46-50
주제 단열 전단밴드
인장형 홉킨슨봉 시험기
전단시편
유한요소법
Adiabatic shear band
Tension split Hopkinson bar
Shear specimen
Finite element method
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