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Research Papers

Time-Independent and Time-Dependent Inelastic Strain Analysis of Lead-Free Solder by Cyclic Loading Test Using Stepped Ramp Waves

[+] 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

1

Corresponding author.

J. Electron. Packag 132(4), 041003 (Nov 23, 2010) (7 pages) doi:10.1115/1.4002897 History: Received December 09, 2009; Revised September 14, 2010; Published November 23, 2010; Online November 23, 2010

We previously proposed an elastic-plastic-creep model to estimate the fatigue strength of lead-free solder joints subjected to cyclic thermal loading. The proposed model requires detailed experimental data regarding the time-independent plastic strain and the time-dependent creep strain during cyclic thermal loading. This paper proposes an experimental method for determining the characteristics of both the plastic and creep strains generated during cyclic loading that employs stepped ramp waves. This method is applied to cyclic tension-compression loadings using a Sn–3.0Ag–0.5Cu lead-free solder for several loading conditions. The method can separate between the time-independent plastic strain and the time-dependent creep strain in cyclic inelastic deformation of solder alloys.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry of test specimens

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Figure 2

Schematic outline of the waveforms for cyclic tension-compression loading

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Figure 3

Road map of experimental procedure

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Figure 4

Comparison of hysteresis loops for various strain rates

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Figure 5

Comparison of hysteresis loops for various strain amplitudes

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Figure 6

Comparison of the hysteresis loops for test condition 3 for (a) TW and (b) SW

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Figure 7

Comparison of Nfsw obtained by SW loading and Nftw obtained by TW loading

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Figure 8

Enlargement of stress-strain relation shown in Fig. 6

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Figure 9

Stress-plastic strain relation and stress-creep strain relation in the stress-strain relation in Fig. 6

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Figure 10

(a) Stress-plastic strain relations and (b) stress-creep strain relations for test conditions 1 and 3

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Figure 11

Comparison of the creep strain rates on tensile and compressive sides

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Figure 12

Stress-plastic strain relations for test conditions 2, 3, and 4

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Figure 13

Comparison of flow stresses for various strain amplitudes

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