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Research Papers

A Shear Strength Degradation Model for Anisotropic Conductive Adhesive Joints Under Hygrothermal Conditions

[+] Author and Article Information
Bo Tao

e-mail: taobo@mail.hust.edu.cn

Zhouping Yin

e-mail: yinzhp@mail.hust.edu.cn

Youlun Xiong

State Key Laboratory of Digital
Manufacturing Equipment and Technology,
Huazhong University of Science and Technology,
Wuhan, Hubei 430074, China

1Corresponding author.

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received December 27, 2012; final manuscript received September 25, 2013; published online November 12, 2013. Assoc. Editor: Seungbae Park.

J. Electron. Packag 135(4), 041008 (Nov 12, 2013) (7 pages) Paper No: EP-12-1112; doi: 10.1115/1.4025840 History: Received December 27, 2012; Revised September 25, 2013

Hygrothermal environments can degrade anisotropic conductive adhesive (ACA) joints by weakening the shear strength of adhesive interface. In this paper, the shear strength degradation model of ACA joints under hygrothermal conditions was formulated through experimental testing and theoretical modeling. The shear strength degradation data were obtained from different hygrothermal aging tests and the ACA moisture properties were characterized for the corresponding hygrothermal conditions. Theoretical models considering the hygrothermal factors of T (temperature), RH (relative humidity), and t (time), were used to fit the shear strength degradation data. It was found that the inverse exponential law was the best candidate model to predict the degradation data. The shear strength degradation model of ACA joints under hygrothermal conditions was proposed, where the relationship of the S (shear strength) and the hygrothermal factors (T, RH, and t) was expressed in an analytical model. The degradation model was validated by experiments, and the model predictions agreed well with the test results.

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References

Figures

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Fig. 1

Methodology for degradation model establishment

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Fig. 2

(a) Schematic of the ACA joint sample, (b) measurement principle, and (c) plot of maximum shear force

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Fig. 3

Test data and Fick's fitting curves

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Fig. 4

ln(D) versus 1/T curve of ACA

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Fig. 5

ln(Csat) versus 1/T curve of ACA

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Fig. 6

Inverse exponential law fitting

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Fig. 8

Two-dimension moisture diffusion

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Fig. 7

Plot of the experimental result and model prediction

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