Abstract/Details

High accelerations produced through secondary impact and its effect on reliability of printed wiring assemblies


2010 2010

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Abstract (summary)

The focus of this thesis is the investigation of extremely high accelerations through secondary impact and its effect on reliability of printed wiring assemblies. The test equipment consists of a commercially available drop system and a commercially available attachment termed a Dual Mass Shock Amplifier (DMSA), which extends the impact acceleration range to as much as 30,000 Gs by utilizing secondary impact dynamics. Further secondary impacts between the test vehicle and fixture are intentionally generated in simulation and tested experimentally to imitate board 'slap' phenomena in product assemblies, and to generate even further amplification of the acceleration at various locations on the test specimen.

In this thesis a detailed description of the test equipment and modeling techniques are provided. Model complexity ranges from simple analytic closed-form rigid-body mechanics to detailed nonlinear dynamic finite element analysis. The effects of different equipment design parameters (table mass, spring stiffness, table clearance) are investigated through parametric modeling. The effects of contact parameters (constraint enforcement algorithms, stiffness, damping) on model accuracy are explored. Test fixtures for high shock accelerations are discussed and used for board level reliability testing of printed wire assemblies containing WLCSP49s and MEMS microphones.

Indexing (details)


Subject
Electrical engineering;
Mechanical engineering
Classification
0544: Electrical engineering
0548: Mechanical engineering
Identifier / keyword
Applied sciences; Drop test; Drop tower; Pwb; Secondary impact
Title
High accelerations produced through secondary impact and its effect on reliability of printed wiring assemblies
Author
Douglas, Stuart Taylor
Number of pages
101
Publication year
2010
Degree date
2010
School code
0117
Source
MAI 49/02M, Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124269870
Advisor
Dasgupta, Abhijit
Committee member
Baz, Amr; Bruck, Hugh
University/institution
University of Maryland, College Park
Department
Mechanical Engineering
University location
United States -- Maryland
Degree
M.S.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
1482499
ProQuest document ID
762221043
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/762221043
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