서지주요정보
다단계 등통로각압출의 설계규칙 = Design rule of multipass equal channel angular extrusion
서명 / 저자 다단계 등통로각압출의 설계규칙 = Design rule of multipass equal channel angular extrusion / 이정호.
저자명 이정호 ; Lee, Jeong-Ho
발행사항 [대전 : 한국과학기술원, 2004].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8014952

소장위치/청구기호

학술문화관(문화관) 보존서고

MME 04054

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Equal channel angular extrusion (ECAE) is a technique that induces severe plastic shear deformation without changing the cross-sectional shape of the workpiece. As this forming technique greatly refines the grain size, it is an effective method of obtaining materials with high strength and toughness. Many researches have been done for the study of ECAE process and material behavior but not for a design rule of ECAE process. Therefore, this study proposes a design rule of an effective ECAE process for the practical application by investigating the ECAE process using finite element (FE) simulations. The forming simulation tool, CAMPform-3D, based on the rigid thermo-viscoplastic approach and constant shear friction model, was currently used to simulate the ECAE process. The accuracy of FE simulation results was verified through comparison of numerical data with experimental findings. Experiments with commercially-available pure titanium (CP-Ti) specimen with a circular cross-section were carried out. Since the friction condition at the die and workpiece interface directly affects the forming load requirement and deformed shape in the ECAE process, it was currently evaluated by comparing the measured forming load and deformed shape obtained from experiments with simulation results. Among various ECAE process parameters, the die corner angle and processing route are main factors which have significant effect on the strain distribution and consequently the mechanical quality of the final product. Thus, the effect of these parameters on the strain distribution was currently examined using FE analyses. The relationship between strain distribution and material properties was investigated from tensile test of the ECA extruded specimen. Based on these findings, a design rule for obtaining desirable mechanical properties in the ECAE process is proposed in the present investigation.

서지기타정보

서지기타정보
청구기호 {MME 04054
형태사항 iii, 76 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jeong-Ho Lee
지도교수의 한글표기 : 임용택
지도교수의 영문표기 : Yong-Taek Im
학위논문 학위논문(석사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 27-30
주제 등통로각압출
설계규칙
유한요소해석
equal channel angular extrusion
design rule
finite element analysis
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