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TECHNICAL PAPERS

Viscoelastic Influence on Dynamic Properties of PCB Under Drop Impact

[+] Author and Article Information
Fang Liu

The State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, ChinafangL@sjtu.edu.cn

Guang Meng, Mei Zhao

The State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China

J. Electron. Packag 129(3), 266-272 (Mar 15, 2007) (7 pages) doi:10.1115/1.2753910 History: Received January 21, 2006; Revised March 15, 2007

Dynamic properties of printed circuit board (PCB) assembly under drop impact are investigated when viscoelasticity of substrate materials is considered. The main materials of a PCB substrate are macromolecule resins, which are typical viscoelastic materials. From the viewpoint of viscoelasticity, the dynamics of PCBs under drop impact is analyzed based on mass-damping-spring, beam, and plate theories. It is demonstrated that the viscoelasticity of a PCB has distinct influences on the dynamic properties of PCBs under board-level drop impact. When there is an increase in the viscosity of substrate materials, the damping coefficients of PCBs would rise, its deflection and acceleration responses could diminish faster, and the maximum deflection of PCBs would become smaller. Meanwhile, with the same viscosity and drop impact conditions, a larger plate would produce a bigger deflection response. Therefore, drop impact reliability could be enhanced by choosing substrate material of larger viscoelasticity and reducing properly the size of PCBs. Dynamic analysis of PCBs under drop impact not only contributes to perfecting theoretical research, but also provides a reference for the choice of substrate materials and reliability design of PCBs when electronic products are devised.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A typical drop impact test setup (7)

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Figure 2

(a) PCB modeled as a single mass-damping-spring system, (b) input acceleration pulse

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Figure 3

Beam model and the coordinate system

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Figure 4

Plate model and the coordinate system (simply supported on four edges) (7)

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Figure 5

ωd versus η (a) the first frequency, (b) the fifth frequency

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Figure 6

Viscosity η versus the first five decrement coefficients δ

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Figure 7

η=0Pas deflection (a) and acceleration (b) curves of midpoint of beam (time domain)

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Figure 8

η=900Pas deflection (a) and acceleration (b) curves of midpoint of beam (time domain)

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Figure 9

η=90,000Pas deflection (a) and acceleration (b) history of midpoint of beam

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Figure 10

η=0Pas deflection (a) and acceleration (b) of No. 1 plate’s center (time domain)

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Figure 11

η=900Pas deflection (a) and acceleration (b) history of No. 1 plate’s center

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Figure 12

η=90,000Pas deflection (a) and acceleration (b) history of No. 1 plate’s center

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Figure 13

η=90,000Pas deflection (a) and acceleration (b) history of No. 2 plate center

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Figure 14

η=90,000Pas deflection (a) and acceleration (b) history of No. 3 plate center

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