2005 Fiscal Year Final Research Report Summary
Development of Miniature Creep Testing for Environment-Friendly Solders
| Project/Area Number |
16560088
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Maizuru National College of Technology |
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Principal Investigator |
TAKADA Akiko Maizuru National College of Technology, Department of Mechanical Engineering, Associate Professor, 機械工学科, 助教授 (80043363)
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| Co-Investigator(Kenkyū-buntansha) |
SAKANE Masao Ritsumeikan University, Faculty of Science and Engineering, Professor, 理工学部, 教授 (20111130)
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| Project Period (FY) |
2004 – 2005
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| Keywords | Solder / Creep / Rupture Time / Electronic Device / Constitutive Equation / Larson-Miller Parameter / Size Effect |
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| Research Abstract |
Solders have been used as a connecting material mechanically and electrically in electronic devices used for computers, automobiles, home electronics etc. Strength data have not been systematically obtained because solders have not been considered as a strength material. However, the strength data of solders began to compile recently in various testing methods.
One of the recent major issues relating to quality assurance of solder connections is on the reliability of miniature solder connections. Dimensions of the miniature solder connections are for 100μm-1mm and creep rupture properties for such small dimensions have not been discussed. Thus, development of the miniature creep testing method of solders applicable to such small connections is needed.
This study developed a new miniature creep testing method using specimens whose gage diameters were for 0.3-2mm. Systematic miniature creep tests were carried out using Sn-37Pb and Sn-3.5Ag miniature specimens ranging the specimen diameter from 0.3mm to 2mm. A new evaluation method for miniature creep strength was proposed based on the bulk data. The size effect on creep rupture live for Sn-37Pb and Sn-3.5Ag was discussed based on the bulk and miniature creep data.
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