Fracture Criterion for AZ31 Mg Alloy Plate at Elevated Temperature

석동윤; 김대용; 김상우; 백정환; 이영선; 정관수                                         /Kwansoo Chung

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자료유형: 학술저널

저자정보: 석동윤 김대용 김상우 백정환 이영선 정관수 /Kwansoo Chung

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.21 No.1

발행연도: 2015.1

수록면: 54 - 71 (18page)

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The fracture criterion was characterized for an AZ31 Mg alloy plate with the 3.0 mm thickness at the elevatedtemperature of 250 °C in this work. In order to properly characterize the fracture criterion, its mechanicalproperties were also characterized. As for mechanical properties, simple tension tests were performed tocalibrate the Hill1948 yield function. Also, in order to account for the hardening deterioration (softening)behavior beyond the uniform deformation limit, the flow curves of the Mg alloy plate were numericallyobtained based on the inverse calibration method, in which strain rate sensitivity was also considered. Asfor the fracture criterion, effective fracture strains, which are dependent on stress triaxiality and deformationpaths, were numerically characterized utilizing experimental data based on specimens with four differentshapes newly developed. For comparison purposes, empirical fracture criteria such as the Cockcroft-Latham,Brozzo, Ayada and Clift models were also calibrated. For validation purposes, the five fracture criteriawere applied for a real part (an EL-cover) drawing case and the result confirmed that the fracture criteriondeveloped in this work performed best among the five models tried out.

#metals #fracture #drawing #stress-triaxiality #softening behavior

참고문헌 (36)

참고문헌 신청

S. Lee / 2002 / J. Mater. Process. Tech 124:19

E. Doege / 2001 / J. Mater. Process. Tech 115:14

F. -K. Chen / 2003 / J. Mater. Process. Tech 142:643

H. Palaniswamy / 2004 / J. Mater. Process. Tech 146:52

S. H. Zhang / 2007 / J. Mater. Process. Tech 185:147

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