Research Papers

Notch Effect on Low Cycle Fatigue of Sn–3.5Ag Solder

[+] Author and Article Information
Mineo Nozaki

Product Innovation Department, Hyogo Prefectural Institute of Technology, 3-1-12 Yukihira-cho, Suma-ku, Kobe, Hyogo 654-0037, Japannozaki@hyogo-kg.go.jp

Masao Sakane

Department of Mechanical Engineering, Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu-shi, Shiga 525-8577, Japansakanem@se.ritsumei.ac.jp

Yutaka Tsukada

Advanced Packaging Laboratory, KYOCERA SLC Technologies Corporation, 656 Ichimiyake Yasu-shi, Shiga 520-2362, JapanYuTsukada@aol.com

J. Eng. Mater. Technol 130(1), 011001 (Dec 20, 2007) (7 pages) doi:10.1115/1.2806237 History: Received January 25, 2006; Revised August 25, 2007; Published December 20, 2007

This paper studies the notch effect on low cycle fatigue of Sn–3.5Ag solder. Strain controlled push-pull low cycle fatigue tests were carried out using three circumferential notched specimens at 313K. Cycles to crack initiation were measured by an a.c. potential method, and cycles to failure and for crack propagation were also determined in experiments. Cycles to failure, to crack initiation, and for propagation decreased with elastic stress concentration factor but cycles to crack initiation were most sharply reduced with elastic stress concentration factor. Prediction methods of cycles to crack initiation, for propagation, and to failure were discussed from the data fitting and the local strain approach utilizing finite element analysis.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Shape and dimensions of the specimen tested (mm)

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Figure 2

A.c. potential measuring method

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Figure 3

An example of potential change with cycles

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Figure 4

Effect of elastic stress concentration factor on crack initiation, crack propagation, and failure lives

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Figure 5

Correlation of number of cycles to failure with total strain range for notched and unnotched specimens

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Figure 6

Relationships between number of cycles to failure and elastic stress concentration factor

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Figure 7

Comparison of failure life predicted by Eq. 2 with experimental life

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Figure 8

Finite element method (FEM) mesh used

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Figure 9

Cyclic stress-strain curve of unnotched specimen used for FE analyses

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Figure 10

Axial strain distribution in the notch section obtained by FE analysis

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Figure 11

Comparison of crack initiation life predicted by Eq. 1 with the experimental life

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Figure 12

Correlation of cycles for crack propagation with mean strain range in the notch section

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Figure 13

Comparison of cycles for crack propagation predicted with experimental results by mean strain range in notch section

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Figure 14

Fracture surface of Sn–3.5Ag solder for Kt=6.0, ε̇=0.5%∕s and Δεt=0.7%



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