서지주요정보
준고속 변형률 속도에서의 인장실험 및 유한요소법을 이용한 박판 인장시편의 형상결정 = Tension test and specimen design with the finite element method at intermediate strain rates
서명 / 저자 준고속 변형률 속도에서의 인장실험 및 유한요소법을 이용한 박판 인장시편의 형상결정 = Tension test and specimen design with the finite element method at intermediate strain rates / 송정한.
저자명 송정한 ; Song, Jeong-Han
발행사항 [대전 : 한국과학기술원, 2002].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8012772

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 02029

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The strain-rate dependent mechanical properties of a sheet metal are indispensable for the reliability of the light-weight design and the crashworthiness of auto-body because the mechanical properties are remarkably changed by the level of the strain-rates. Since the level of the strain-rate in the crash analysis is between 10 /sec and 500 /sec, an appropriate experimental method has to be developed in order to acquire the material properties at the corresponding strain-rate In this study, an experimental apparatus is developed with the servo-hydraulic press (HRS: Hot Rolling Simulator) that guarantees the fast crosshead speed. The apparatus is , capable of the tension test at intermediate strain rates ranged form 1 /sec to 300 /sec. A jig is devised to convert the compressive motion of the HRS into the tensile motion with sensors attached to measure the load and displacement of a specimen. Experiments are carried out between the strain-rate of 4 /sec and 40 /sec to investigate the capacity of the apparatus and the limit of strain rate that can be obtained with the apparatus. It is confirmed that well performed the apparatus from the result of experiments. Design the specimen is important to perform the experiment because there is not standard tension specimen for the dynamic test. Numerical simulations are carried out in order to determine the dimensions and the shape of the specimen with an elasto-plastic explicit finite element method. In FE simulation and stress update, the plastic predictor - elastic corrector (PPEC) method is applied in order to integrate the stress tracking the Johnson-Cook constitutive equation over a time step. The scheme adopts secant iteration in the plastic predictor - elastic corrector method in order to satisfy the plane stress condition. Finite element simulations are carried out to investigate the effect of the variation of geometric parameters in specimen such as the gauge length, the width and the fillet radius. Optimum dimensions are determined for standard specimens at the various strain- rates considering the effect of parametric variation and the crosshead speed of a press.

서지기타정보

서지기타정보
청구기호 {MME 02029
형태사항 xiii, 79 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jeong-Han Song
지도교수의 한글표기 : 허훈
지도교수의 영문표기 : Hoon Huh
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 47-49
주제 변형률 속도
인장실험
시편형상
tension test
intermediate strain rate
finite element method
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