0
Research Papers

Evaluation of Time-Independent and Time-Dependent Strains of Lead-Free Solder by Stepped Ramp Loading Test

[+] Author and Article Information
Ken-ichi Ohguchi1

Department of Materials Science and Engineering, Akita University, Tegatagakuen-cho 1-1, Akita 010-8502, Japanken@ipc.akita-u.ac.jp

Katsuhiko Sasaki

Division of Human Mechanical Systems and Design, Hokkaido University, N13 W8 Kita-ku, Sapporo 060-8628, Japan

Setsuo Aso

Department of Materials Science and Engineering, Akita University, Tegatagakuen-cho 1-1, Akita 010-8502, Japan

1

Corresponding author.

J. Electron. Packag 131(2), 021003 (Mar 27, 2009) (7 pages) doi:10.1115/1.3103951 History: Received May 09, 2008; Revised November 26, 2008; Published March 27, 2009

This paper proposes a method to estimate basic material constants in an elasto-plastic-creep constitutive model for lead-free solders by conducting only a tensile test. The test employs a stepped ramp wave loading, which repeats instantaneous strain and strain maintenance. Time-independent strains are obtained from the stress-strain relations at the instantaneously strained parts, while the time-dependent strains are obtained from the stress-time relations during the strain maintaining periods. Based on the obtained time-independent and time-dependent strains, the values of the material constants in the elasto-plastic-creep model proposed by the authors are determined. Simulations of the viscoplastic deformations of a Sn–3.0Ag–0.5Cu solder alloy are also conducted to verify the validity of the proposed method.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Geometry of test specimens

Grahic Jump Location
Figure 2

Schematic outline of the stepped ramp wave loading with test condition

Grahic Jump Location
Figure 3

Stress-strain relation under stepped ramp wave loading

Grahic Jump Location
Figure 4

Stress relaxation curve by maintaining the εend strain

Grahic Jump Location
Figure 5

Schematic outline of the stress-strain relation induced by stepped ramp wave loading

Grahic Jump Location
Figure 6

Relationship between stress and elasto-plastic strain with the stress-strain relation in Fig. 3

Grahic Jump Location
Figure 7

Relationship between stress relaxation amplitude and number of cycles of stepped ramp waves

Grahic Jump Location
Figure 8

Relationship between creep strain rate and stress

Grahic Jump Location
Figure 9

Relationship between the (ε̇tc)I/(ε̇tc)II ratio and transient creep strain

Grahic Jump Location
Figure 10

Calculated stress-strain relations with experimental results

Grahic Jump Location
Figure 11

Calculated creep curve with experimental result

Grahic Jump Location
Figure 12

Comparison of steady-state creep strain rates of predictions and those of experiments

Grahic Jump Location
Figure 13

Calculated cyclic tension-compression loading with experimental result under strain rate of 5.0×10−3 l/s

Grahic Jump Location
Figure 14

Calculated cyclic tension-compression loading with experimental result under strain rate of 5.0×10−3 l/s on the tensile side and 5.0×10−5 l/s on the compressive side

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In