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초록· 키워드
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It is difficult to estimate the properties of multilayered sheet because they are composed of one or more different materials. Plastic deformation behavior of the multilayered sheet is quite different as compared to each material individually. The deformation behavior of multilayered sheet should be investigated in order to prevent forming defects and to predict the properties of the formed part. In this study, the mechanical properties and formability of stainless steelaluminum-magnesium multilayered sheet were investigated. The multilayered sheet needs to be deformed at an elevated temperature because of its poor formability at room temperature. Uniaxial tensile tests were performed at various temperatures and strain rates. Fracture patterns changed mainly at a temperature of 200℃. Uniform and total elongation of multilayered sheet increased to values greater than those of each material when deformed at 250℃. The limiting drawing ratio (LDR) was obtained using a circular cup deep drawing test to measure the formability of the multilayered sheet. A maximum value for the LDR of about 2 was achieved at 250℃, which is the appropriate forming temperature for the Mg alloy. Fracture patterns on a circular cup and thickness of formed part were predicted by a rigid-viscoplastic FEM analysis. Two kinds of modeling techniques were used to simulate deep drawing process of multilayered sheet. A singlelayer FE-model, which combines the three different layers into a macroscopic single layer, predicted well the thickness distribution of the drawn cup. In contrast, the location and the time of fracture were estimated better with a multi-layer FE model, which used different material properties for each of the three layers.
목차
Abstract
1. 서론
2. 실험
3. 원통컵 드로잉 공정 수치해석
4. 결론
참고문헌
참고문헌 (13)
참고문헌 신청
1. [학술지(정기간행물)] - H. Y. Ryu / 2001 / An elasto-plastic analysis on deep drawing of clad sheet metal / Trans. Mater. Process 10 (5) : 411 ~ 417
3. [학술지(정기간행물)] - K. Iwanaga / 2004 / Improvement of formability from room Temperature to warm temperature in AZ-31 magnesium alloy / J. Mater. Process. Technol 155 : 1313 ~ 1316
4. [학술지(정기간행물)] - F. K. Chen / 2003 / Deep drawing of square cups with magnesium ally AZ31 sheet / Int. J. Mach. Tools Manuf 43 (15) : 1553 ~ 1559
5. [학술지(정기간행물)] - J. E. Lee / 2007 / Effects of annealing on the mechanical and interface properties of stainless steel/aluminum/cupper clad-metal sheets / J. Mater. Process. Technol 187 : 546 ~ 549
6. [학술지(정기간행물)] - H. D. Manesh / 2003 / Bond strength and formability of an aluminum-clad steel sheet / J. Alloys Compd 361 : 138 ~ 143
3. [학술지(정기간행물)] - K. Iwanaga / 2004 / Improvement of formability from room Temperature to warm temperature in AZ-31 magnesium alloy / J. Mater. Process. Technol 155 : 1313 ~ 1316
4. [학술지(정기간행물)] - F. K. Chen / 2003 / Deep drawing of square cups with magnesium ally AZ31 sheet / Int. J. Mach. Tools Manuf 43 (15) : 1553 ~ 1559
5. [학술지(정기간행물)] - J. E. Lee / 2007 / Effects of annealing on the mechanical and interface properties of stainless steel/aluminum/cupper clad-metal sheets / J. Mater. Process. Technol 187 : 546 ~ 549
6. [학술지(정기간행물)] - H. D. Manesh / 2003 / Bond strength and formability of an aluminum-clad steel sheet / J. Alloys Compd 361 : 138 ~ 143
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