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RESEARCH PAPERS

A Strain Rate Ratio Approach for Assessing Creep-Fatigue Life of 63Sn-37Pb Solder Under Shear Loading

[+] Author and Article Information
Yutaka Tsukada

 KYOCERA SLC Technologies Corporation, 656 Ichimiyake, Yasu-shi, Shiga, 520-2362, Japanyutsukada@aol.com

Hideo Nishimura

 IBM JAPAN, Ltd., Yasu, 800, Ichimiyake, Yasu-cho, Yasu-gun, Shiga, 520-2392, Japan

Hiroki Yamamoto

 Ritsumeikan University, 1-1-1, Nojihigashi, Kusatsu-shi, Shiga, 520-8577, Japan

Masao Sakane

Department of Mechanical Engineering, Faculty of Science and Engineering, Ritsumeikan University, 1-1-1, Nojihigashi, Kusatsu-shi, Shiga, 520-8577, Japansakanem@se.ritsumei.ac.jp

J. Electron. Packag 127(4), 407-414 (Dec 24, 2004) (8 pages) doi:10.1115/1.2070091 History: Received December 17, 2004; Revised December 24, 2004

This paper studies creep-fatigue life prediction under shear loading by making extensive torsion creep-fatigue experiments using four kinds of strain waves. The linear damage rule, strain range partitioning method, frequency modified fatigue life, and ductility exhaustion model were applied to the experimental data, but no methods accurately predicted the creep-fatigue life. A new method based on the strain rate ratio, which predicted the creep-fatigue life within a factor of 4 scatter band, was developed.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Shape and dimensions of the hollow cylinder specimen tested in millimeters

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Figure 2

Four strain waves used for tests

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Figure 3

Correlation of creep-fatigue lives with von Mises’ inelastic strain range

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Figure 4

Variation of stress amplitude during strain-hold at Δεeq=1.5%

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Figure 5

Static tension creep rupture data

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Figure 6

Variation of cycles to failure in cc wave with strain rate

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Figure 7

Creep-fatigue damage diagram by linear damage rule

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Figure 8

Comparison between life Nfpre predicted by linear damage rule and experimental life Nfexp

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Figure 9

Comparison between life Nfpre predicted by frequency modified fatigue life and experimental life Nfexp

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Figure 10

Correlation between life Nfpre predicted by strain range partitioning method and experimental life Nfexp

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Figure 11

Correlation between life Nfpre predicted by ductility exhaustion method and experimental life Nfexp

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Figure 12

Variation of cycles to failure with hold-time

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Figure 13

Variation of cycles to failure with strain rate ratio in cp test

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Figure 14

Comparison between the life Nfpre predicted by the strain rate ratio method and experimental life Nfexp

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Figure 15

Surface cracks at failure observed by scanning electric microscope. (a) pp wave, Δεeq=0.7%,0.5%∕s. (b) cc wave, Δεeq=0.3%,0.1%∕s. (c) cc wave, Δεeq=0.3%,0.05%∕s. (d) cc wave, Δεeq=1.5%,0.005%∕s. (e) cp wave, Δεeq=0.7%,0.25%∕s∕0.5%∕s. (f) cp wave, Δεeq=0.7%,0.05%∕s∕0.5%∕s. (g) cp wave, Δεeq=0.7%,0.005%∕s∕0.5%∕s. (h) th wave, 10 min, Δεeq=2.0%. (i) th wave, 30 min, Δεeq=2.0%. (j) th wave, 5∕5min,Δεeq=2.0%.

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Figure 16

Electron back scattering pattern image of the Sn phase

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