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Research Papers

Comparison of Electronic Component Durability Under Uniaxial and Multiaxial Random Vibrations

[+] Author and Article Information
Matthew Ernst

Applied Physics Laboratory,
Johns Hopkins University,
Laurel, MD 20723
e-mail: ernstm@gmail.com

Ed Habtour

Vehicle Technology Directorate,
U. S. Army Research Laboratory,
Aberdeen Proving Ground,
MD 21005
e-mail: ed.m.habtour.civ@mail.mil

Abhijit Dasgupta

Center for Advanced Life Cycle Engineering,
University of Maryland,
College Park, MD 20742
e-mail: dasgupta@umd.edu

Michael Pohland

U.S. Army Materiel System Activity Analysis,
Aberdeen Proving Ground,
MD 21005
e-mail: michael.f.pohland.civ@mail.mil

Mark Robeson

U.S. Army's Aviation Development
Directorate at Ft. Eustis,
Ft. Eustis, VA 23604
e-mail: mark.e.robeson.civ@mail.mil

Mark Paulus

Naval Undersea Warfare Center,
Keyport, WA 98345
e-mail: mark.paulus@navy.mil

Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received June 26, 2014; final manuscript received August 24, 2014; published online October 15, 2014. Assoc. Editor: Satish Chaparala.

This work is in part a work of the U.S. Government. ASME disclaims all interest in the U.S. Government's contributions.

J. Electron. Packag 137(1), 011009 (Oct 15, 2014) (8 pages) Paper No: EP-14-1062; doi: 10.1115/1.4028516 History: Received June 26, 2014; Revised August 24, 2014

Multiaxial and uniaxial vibration experiments were conducted in order to study the differences in failure modes and fatigue life for the two types of excitation. An electrodynamic (ED) shaker capable of controlled vibration in six degrees of freedom (DOF) was employed for the experiments. The test specimen consisted of six large inductors insertion mounted on a printed wiring board (PWB). Average damage accumulation rate (DAR) in the inductor leads was measured for random excitations in-plane, out-of-plane, and both directions simultaneously. Under simultaneous multiaxial excitation, the average DAR was found to be 2.2 times greater than the sum of the in-plane and out-of-plane DARs. The conclusion was that multiple-step sequential uniaxial testing may significantly overestimate the durability of large/heavy structures with high center of mass in a multiaxial dynamic environment. Additionally, a test method utilizing uniaxial vibration along a direction other than the principal directions of the structure was examined. This method was found to have significant limitations, but showed better agreement with simultaneous multiaxial vibration experiments.

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References

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Figures

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Fig. 1

Photograph of test specimen on shaker table

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Fig. 2

Test specimen schematic

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Fig. 3

External view of inductor

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Fig. 4

Inductor with shrink wrap removed

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Fig. 5

Inductor with tape wrap removed

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Fig. 6

Inductor dimensions

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Fig. 7

Outside coil wrap (stiff lead)

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Fig. 8

Inside coil wrap (compliant lead)

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Fig. 10

Vibration mode VII

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Fig. 11

Vibration mode VIII

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Fig.12

MDOF shaker (partially disassembled)

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Fig. 13

Vibration power spectral density functions

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Fig. 14

Single-axis and combined-axes (incoherent) average DARs

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Fig. 15

Multiaxial response amplification for component flexure in the x direction

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Fig. 16

Comparison between combined multiaxial excitation and superposition at 0.78 Grms

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Fig. 17

Comparison between combined multiaxial excitation and superposition at 3.14 Grms

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Fig. 18

Measured PWB response in out-of-plane, z direction

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Fig. 19

Coherent and incoherent average DARs

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