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2 edition of Plated through via defects and their influence on fatigue life. found in the catalog.

Plated through via defects and their influence on fatigue life.

Oleg Belashov

Plated through via defects and their influence on fatigue life.

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  • 23 Currently reading

Published .
Written in English


About the Edition

Nano-indentation experiments on cross-sectioned barrels showed that thinner plating results in a slightly increased nano-indentation hardness, a property related to the yield strength.Finite element analysis (FEA) were used to develop correlations that can be used to calculate the stress concentration factors (SCFs) for five typical defects found in plated-through-vias (PTVs) as a function of various geometric parameters. In terms of their severity, the defects were ranked as: (1) rapid thickness reduction (SCF≤13), (2) occasional waviness (SCF≤4.6), (3) gradual thickness reduction (SCF≤4), (4) wicking (SCF≤4) and (5) waviness (SCF≤3.1). The SCF due to an internal pad and the influence of an external pad-barrel corner crack were also investigated.Elastic-plastic thermal strain analyses were conducted on perfect and defective vias using FEA and a modified version of an earlier analytical model. Both approaches were in a good agreement for vias with a board to barrel-wall thickness ratio greater than 40.

The Physical Object
Pagination120 leaves.
Number of Pages120
ID Numbers
Open LibraryOL19551745M
ISBN 109780494212745

When Victor Frankenstein says “To examine the causes of life, we must for have recourse to death,” it carries more than one meaning. On the surface, it is difficult from a scientific. Plated through hole (PTH) plays a critical role in printed circuit board (PCB) reliability. Thermal fatigue deformation of the PTH material is regarded as the primary factor affecting the lifetime of electrical devices. Numerous research efforts have focused on the failure mechanism model of PTH. Some studies have shown that around 10% of people, within one year, have blood in their stool and this can be a very traumatic experience. The amount of blood is different in different people and the stool might look sticky and black, or even be the color of the plum. If you notice your stool to have this color, make sure you seek medical. n People are seen as valued human beings who struggle with the problems of their existence, and who are free to make their own choices. The DSM-5 spectrum of disorders n A Level 1 assessment involves a brief survey of 12 or 13 symptom domains rated on a 5-point severity scale.


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Plated through via defects and their influence on fatigue life. by Oleg Belashov Download PDF EPUB FB2

A previously published analytical model for thermal stress and strain in idealized plated-through-vias (PTVs) has been adapted to conduct elastic-plastic analyses of vias with geometric defects. Pages (July ) Download full issue. Previous vol/issue.

Next vol/issue. A through-process, thermomechanical model for predicting welding-induced microstructure evolution and Plated through via defects and their influence on fatigue life.

book high-temperature fatigue response select article Statistical analysis of the influence of defects on fatigue life using a Gumbel distribution. I’d start with Willpower: Rediscovering the Greatest Human Strength. Chapter 4 is all about Plated through via defects and their influence on fatigue life.

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Public Schools) Ph.D. Reliability Engineering Effects of Thermal and Humidity Cycling on 3-D Electronic Packaging Technology M.S.

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Miller is the editor of The Behaviour of Short Fatigue Cracks - EGF 1 - published by Wiley. de los Rios is the editor of The Behaviour of Short Fatigue Cracks - EGF 1 - published by : Hardcover. Based on fatigue failure theories (stress-life theories such as; Goodman and Gerber), this paper presents a technique to predict the fatigue life of a shell structure of different materials with.

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Fatigue limit is the maximum stress amplitude level below which material can endure an essentially infinite number of stress cycles and not fail. Therefore, this testing is important in order to know fatigue limit.

The factors that affect fatigue life is mean stress σ m, which is when reduced the mean stress will increased the fatigue life.

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