This study first proposes a simple constitutive model for viscoplasticity, which includes the elastic, plastic, and creep strains independently. The plastic strain is evaluated by the flow rule employing back stresses evolved with a Ziegler type of hardening rule. The creep strain is evaluated by the modified Norton’s law. The applicability of this constitutive model is evaluated with pure tensile tests, creep tests and cyclic tension-compression loading tests, to demonstrate the progress of viscoplastic deformation of 40Pb/60Sn solder alloys. The tests were conducted over both several temperature ranges and strain rates. As a result, it was found that the material constants used in the constitutive model could be determined by simple tests such as pure tensile and cyclic tension-compression loading tests. The simulation by the constitutive model explains accurately the viscoplastic deformation of the 40Pb/60Sn solder alloys.
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December 2001
Additional Technical Papers
Viscoplastic Deformation of 40 Pb/60Sn Solder Alloys—Experiments and Constitutive Modeling
Katsuhiko Sasaki, Associate Professor,,
Katsuhiko Sasaki, Associate Professor,
Division of Mechanical Science, Hokkaido University, N13, W8, Kita-ku, Sapporo, 060-8628 Japan
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Ken-ichi Ohguchi, Research Associate,,
Ken-ichi Ohguchi, Research Associate,
Department of Materials, Akita University, 1-1 Tegatagakuencho, Akita, 010-8502 Japan
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Hiromasa Ishikawa, Mem. ASME, Professor,
Hiromasa Ishikawa, Mem. ASME, Professor,
Division of Mechanical Science, Hokkaido University, Sapporo, Japan
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Katsuhiko Sasaki, Associate Professor,
Division of Mechanical Science, Hokkaido University, N13, W8, Kita-ku, Sapporo, 060-8628 Japan
Ken-ichi Ohguchi, Research Associate,
Department of Materials, Akita University, 1-1 Tegatagakuencho, Akita, 010-8502 Japan
Hiromasa Ishikawa, Mem. ASME, Professor,
Division of Mechanical Science, Hokkaido University, Sapporo, Japan
Contributed by the Electronic and Photonic Packaging Division for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received by the EPPD August 24, 1999. Associate Editor: Nji Hsin Pao.
J. Electron. Packag. Dec 2001, 123(4): 379-387 (9 pages)
Published Online: August 24, 1999
Article history
Received:
August 24, 1999
Citation
Sasaki, K., Ohguchi, K., and Ishikawa, H. (August 24, 1999). "Viscoplastic Deformation of 40 Pb/60Sn Solder Alloys—Experiments and Constitutive Modeling ." ASME. J. Electron. Packag. December 2001; 123(4): 379–387. https://doi.org/10.1115/1.1371927
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