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Article
Publication date: 9 January 2018

Kurian J. Vachaparambil, Gustaf Mårtensson and Lars Essén

The purpose of the paper is to develop a methodology to characterize the rheological behaviour of macroscopic non-Brownian suspensions, like solder paste, based on microstructural…

435

Abstract

Purpose

The purpose of the paper is to develop a methodology to characterize the rheological behaviour of macroscopic non-Brownian suspensions, like solder paste, based on microstructural evolution.

Design/methodology/approach

A structure-based kinetics model, whose parameters are derived analytically based on assumptions valid for any macroscopic suspension, is developed to describe the rheological behaviour of a given fluid. The values of the parameters are then determined based on experiments conducted at a constant shear rate. The parameter values, obtained from the model, are then adjusted using an optimization algorithm using the mean deviation from experiments as the cost function to replicate the measured rheology. A commercially available solder paste is used as the test fluid for the proposed method.

Findings

The initial parameter values obtained through the analytical model indicates a structural breakdown that is much slower than observations. But optimizing the parameter values, especially the ones associated with the structural breakdown, replicates the thixotropic behaviour of the solder paste reasonably well, but it fails to capture the structure build-up during the three interval thixotropy test.

Research limitations/implications

The structural kinetics model tends to under-predict the structure build-up rate.

Practical implications

This study details a more realistic prediction of the rheological behaviour of macroscopic suspensions like solder paste, thermal interface materials and other functional materials. The proposed model can be used to characterize different solder pastes and other functional fluids based on the structure build-up and breakdown rates. The model can also be used as the viscosity definitions in numerical simulations instead of simpler models like Carreau–Yasuda and cross-viscosity models.

Originality/value

The rheological description of the solder paste is critical in determining its validity for a given application. The methodology described in the paper provides a better description of thixotropy without relying on the existing rheological measurements or the behaviour predicted by a standard power-law model. The proposed model can also provide transient viscosity predictions when shear rates vary in time.

Details

Soldering & Surface Mount Technology, vol. 30 no. 1
Type: Research Article
ISSN: 0954-0911

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Article
Publication date: 1 December 2005

Philippe Martin

Nowadays, most European welfare states have to face a crisis and to adapt themselves in the context of globalisation. This is true for most of the “original” European member…

356

Abstract

Nowadays, most European welfare states have to face a crisis and to adapt themselves in the context of globalisation. This is true for most of the “original” European member states, so what a challenge for the European central and eastern countries that had to reform deeply their social systems in order to fit the rules of the market economy and join the European Union. So the point is to know in which direction the national systems of social protection are going by now.

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Managerial Law, vol. 47 no. 6
Type: Research Article
ISSN: 0309-0558

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Abstract

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The Comparative Study of Conscription in the Armed Forces
Type: Book
ISBN: 978-0-76230-836-1

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Article
Publication date: 1 December 1998

F.E. Trainer

Puts forward the limit to growth perspective, which is rarely mentioned in societies devoted to the increase of material living standards. Outlines the resources each individual…

1043

Abstract

Puts forward the limit to growth perspective, which is rarely mentioned in societies devoted to the increase of material living standards. Outlines the resources each individual in rich countries uses and extrapolates those figures to cover the rest of the world’s population, proving that it is clearly impossible to sustain such living standards. Criticizes profit maximization, market forces and the pursuit of business opportunities as inappropriate to the needs of the world’s poor majority. Explores how society could reduce its per capita resource use and environmental impact, particularly through the development of small scale self‐sufficient economies. Points out that most of the real economy would be in non‐cash areas. Hastens to mention that a simpler, less material and closer‐to‐nature lifestyle does not exclude information technology. Indicates that access to communal property and service needs to replace income as the means to a satisfying life. Summarizes how community gardens can be set up and the roles that community workers could play in saving towns.

Details

International Journal of Sociology and Social Policy, vol. 18 no. 11/12
Type: Research Article
ISSN: 0144-333X

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Available. Content available
Article
Publication date: 1 June 2005

812

Abstract

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Interlending & Document Supply, vol. 33 no. 2
Type: Research Article
ISSN: 0264-1615

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The History of EIBA: A Tale of the Co-evolution between International Business Issues and a Scholarly Community
Type: Book
ISBN: 978-1-83608-665-9

Available. Open Access. Open Access
Book part
Publication date: 29 September 2023

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The Emerald Handbook of Childhood and Youth in Asian Societies
Type: Book
ISBN: 978-1-80382-284-6

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Article
Publication date: 1 February 1981

David D. Ginsburg

It's been three years since my previous survey in RSR. Superb reference books in pop music have been appearing so frequently that I've been having trouble keeping up. Let's hope…

165

Abstract

It's been three years since my previous survey in RSR. Superb reference books in pop music have been appearing so frequently that I've been having trouble keeping up. Let's hope “next year's” survey will only be 12 months in the making and not 36.

Details

Reference Services Review, vol. 9 no. 2
Type: Research Article
ISSN: 0090-7324

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Article
Publication date: 1 March 1999

Doris Gordon

Outlines the Libertarian framework of rights and obligations in abortion. Argues that abortion is homicide based upon the scientific and philosophic evidence available and…

1112

Abstract

Outlines the Libertarian framework of rights and obligations in abortion. Argues that abortion is homicide based upon the scientific and philosophic evidence available and disputes further points believed by abortion proponents.

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International Journal of Sociology and Social Policy, vol. 19 no. 3/4
Type: Research Article
ISSN: 0144-333X

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Article
Publication date: 1 January 1985

Meckler Publishing has announced the acquisition of Micro Software Reports and Micro Software Evaluations from Nolan Information Management Services of Torrance, California. Alan…

69

Abstract

Meckler Publishing has announced the acquisition of Micro Software Reports and Micro Software Evaluations from Nolan Information Management Services of Torrance, California. Alan M. Meckler, President of Meckler Publishing, stated that “Micro Software Reports is the world's largest and most comprehensive index to microcomputer software with specific library applications”. He went on to say that “the publication indexes 110 library and computer oriented journals concentrating on information that includes pricing, installation locations and complete system descriptions”.

Details

The Electronic Library, vol. 3 no. 1
Type: Research Article
ISSN: 0264-0473

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