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Article

Ali Khoshkhoo, Andres L. Carrano and David M. Blersch

The purpose of this paper is to elucidate the effect of part thickness and build orientation upon the type and magnitude of distortion in material jetting processes.

Abstract

Purpose

The purpose of this paper is to elucidate the effect of part thickness and build orientation upon the type and magnitude of distortion in material jetting processes.

Design/methodology/approach

Specimens with high (10:1) aspect ratio were printed in two orientations (XY and YX) and three thickness values (1, 3 and 6 mm) and scanned with a white-light profilometer to quantify distortion.

Findings

The results of this paper indicate that 1-mm thick specimens always distorted following a wavy edge type, while thicker specimens (3- and 6-mm) always distorted following a reverse coil set. The factor thickness, when measured with the indices height of the highest peak (H) and profile radius (R), was shown to be statistically significant, with 3-mm specimens experiencing distortions of 57 and 51 per cent, respectively, more severe than those in 6-mm specimens. The thickness effect is attributed to the percentage of build layers that receive maximum energy exposure (61-72 per cent in 1-mm, 87-91 per cent in 3-mm and 93-95 per cent in 6-mm specimens). With respect to the thinner 1-mm specimens, the factor orientation was found to be statistically significant with distortion 114 per cent less severe in the YX orientation when measured by the H index.

Originality/value

This paper provides the first known description of build orientation and part thickness effects on dimensional distortion as a pervasive consequence of the curing process in photopolymerization and explores one of the most common defects encountered in additive manufacturing. In addition to the characterization of the type and magnitude of distortion, the contributions of this paper also include establishing the foundation for design guidelines aiming at minimizing distortion in material jetting.

Details

Rapid Prototyping Journal, vol. 24 no. 9
Type: Research Article
ISSN: 1355-2546

Keywords

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Article

A. Mazeika Bilbao, A.L. Carrano, M. Hewitt and B.K. Thorn

This paper seeks to frame and model the environmental issues and impacts associated with the management of pallets throughout the entire life cycle, from materials to…

Abstract

Purpose

This paper seeks to frame and model the environmental issues and impacts associated with the management of pallets throughout the entire life cycle, from materials to manufacturing, use, transportation to end‐of‐life disposal.

Design/methodology/approach

A linear minimum cost multi‐commodity network flow problem is developed to make pallet‐related decisions based on both environmental and economic considerations.

Findings

This paper presents a review of the environmental impacts associated with pallets by life cycle stage. The types of materials used to fabricate pallets, the methods by which they are treated for specific applications, and various pallet management models are described with respect to embodied energies, toxicity and emissions. The need for companies to understand the cost, durability, and environmental impact tradeoffs presented by pallet choices is highlighted. The paper introduces a model to assist in choosing both how pallets are managed and the material they are constructed of that balances these tradeoffs.

Originality/value

There is limited research on the environmental impact of different management approaches of large‐scale pallet operations. The proposed model and approach will provide companies seeking to engage in more sustainable practices in their supply chains and distribution with insights and a decision‐making tool not previously available.

Details

Management Research Review, vol. 34 no. 11
Type: Research Article
ISSN: 2040-8269

Keywords

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Article

Chiranjit Das and Sanjay Jharkharia

The purpose of this paper is to review the relevant literature on low carbon supply chain management (LCSCM) and classify it on contextual base. It also aims at…

Abstract

Purpose

The purpose of this paper is to review the relevant literature on low carbon supply chain management (LCSCM) and classify it on contextual base. It also aims at identifying key decision-making issues in LCSCM. This paper also highlights some of the future challenges and scope of research in this domain.

Design/methodology/approach

A content analysis is carried out by systematically collecting the literature from major academic sources over a period of 18 years (2000-2017), identifying structural dimensions and classifying it on contextual base.

Findings

There is an increasing trend of research on LCSCM, but this research is still in a nascent stage. All supply chain functions such as supplier selection, inventory planning, network design and logistic decisions have been redefined by integrating emissions-related issues.

Research limitations/implications

Limitation of this study is inherent in its unit of analysis. Only peer-reviewed journal articles published in English language have been considered in this study.

Practical implications

Findings of prior studies on low carbon inventory control, transportation planning, facility allocation, location selection and supply chain coordination have been highlighted in this study. This will help supply chain practitioners in decision making.

Originality/value

Though there are an increasing number of studies about carbon emission-related issues in supply chain management, the present literature lacks to provide a review of the overarching publications. This paper addresses this gap by providing a comprehensive review of literature on emissions-related issues in supply chain management.

Details

Journal of Manufacturing Technology Management, vol. 29 no. 2
Type: Research Article
ISSN: 1741-038X

Keywords

Content available
Article

Niranjan Pati

Abstract

Details

Benchmarking: An International Journal, vol. 23 no. 6
Type: Research Article
ISSN: 1463-5771

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Article

Anh Tuan Nguyen and Nguyen Vang-Phuc Nguyen

The purpose of this paper is to identify the best practices of industrial engineering (IE) programs that could be learnt and used at other educational institutions.

Abstract

Purpose

The purpose of this paper is to identify the best practices of industrial engineering (IE) programs that could be learnt and used at other educational institutions.

Design/methodology/approach

Nine IE programs in the USA are benchmarked using a conceptual framework that considers an educational program as a system consisting of a purpose, a curriculum, resources, and quality processes. The information used in benchmarking is collected from the program self-study reports, course catalogs, and websites which are available on the internet.

Findings

It is found that in spite of their diversity in history, missions, sizes, and reputations, the studied programs are rather unified in terms of purpose definition, curriculum formation, resource selection, and quality process usage. From the analysis, a template of IE curriculum is proposed.

Research limitations/implications

As the selection of the studied programs is based on the availability of the information, the findings may not be representative for IE programs in the USA. Future work can aim at comparing IE programs from various countries.

Practical implications

The findings could be used as benchmarks by IE schools interested in the improvement of operations.

Originality/value

A conceptual framework for benchmarking is proposed and proves useful for comparing educational programs. The findings represent the current best practices at IE schools in the USA.

Details

Benchmarking: An International Journal, vol. 25 no. 4
Type: Research Article
ISSN: 1463-5771

Keywords

Content available
Article

Younss Ait Mou and Muammer Koc

This paper aims to report on the findings of an investigation to compare three different three-dimensional printing (3DP) or additive manufacturing technologies [i.e…

Abstract

Purpose

This paper aims to report on the findings of an investigation to compare three different three-dimensional printing (3DP) or additive manufacturing technologies [i.e. fused deposition modeling (FDM), stereolithography (SLA) and material jetting (MJ)] and four different equipment (FDM, SLA, MJP 2600 and Object 260) in terms of their dimensional process capability (dimensional accuracy and surface roughness). It provides a comprehensive and comparative understanding about the level of attainable dimensional accuracy, repeatability and surface roughness of commonly used 3DP technologies. It is expected that these findings will help other researchers and industrialists in choosing the right technology and equipment for a given 3DP application.

Design/methodology/approach

A benchmark model of 5 × 5 cm with several common and challenging features, such as around protrusion and hole, flat surface, micro-scale ribs and micro-scale long channels was designed and printed repeatedly using four different equipment of three different 3DP technologies. The dimensional accuracy of the printed models was measured using non-contact digital measurement methods. The surface roughness was evaluated using a digital profilometer. Finally, the surface quality and edge sharpness were evaluated under a reflected light ZEISS microscope with a 50× magnification objective.

Findings

The results show that FDM technology with the used equipment results in a rough surface and loose dimensional accuracy. The SLA printer produced a smoother surface, but resulted in the distortion of thin features (<1 mm). MJ printers, on the other hand, produced comparable surface roughness and dimensional accuracy. However, ProJet MJP 3600 produced sharper edges when compared to the Objet 260 that produced round edges.

Originality/value

This paper, for the first time, provides a comprehensive comparison of three different commonly used 3DP technologies in terms of their dimensional capability and surface roughness without farther post-processing. Thus, it offers a reliable guideline for design consideration and printer selection based on the target application.

Details

Rapid Prototyping Journal, vol. 25 no. 5
Type: Research Article
ISSN: 1355-2546

Keywords

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Article

Fakhrodin Lalegani, Mohammad Reza Saffarian, Ahmadreza Moradi and Ebrahim Tavousi

According to very small dimensions of the microchannels, producing a microchannel with smooth surfaces is approximately impossible. The surface roughness can have a

Abstract

Purpose

According to very small dimensions of the microchannels, producing a microchannel with smooth surfaces is approximately impossible. The surface roughness can have a specific effect on microchannel performances. This paper aims to investigate the changes in friction and pressure drop in the microchannels by considering the different roughness elements on microchannel wall and changes in elementary geometry and flow conditions. Results show a significant effect of roughness on the pressure drop and friction.

Design/methodology/approach

Two-dimensional fluid flow in the rough microchannels is analyzed using FLUENT. Microchannels have a height of 50 µm. Water at room temperature (25°C) has been used as working fluid. The Reynolds numbers are considered in laminar flow range and from 50 to 300.

Findings

The results show that the value of friction factor reduces nonlinearly with an increase in Reynolds number. But, the pressure drops and the Poiseuille number in the microchannels increase with an increase in Reynolds number. The values of the pressure drop and the friction factor increase by increasing the height and size of the roughness elements, but these values reduce with an increase in the distance of roughness elements.

Originality/value

The roughness elements types in this research are rectangular, trapezoidal, elliptical, triangular and complex (composed of multiple types of roughness elements). The effects of the Reynolds number, roughness height, roughness distance and roughness size on the pressure drop and friction in the rough microchannels are investigated and discussed. Furthermore, differences between the effects of five types of roughness elements are identified.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 28 no. 7
Type: Research Article
ISSN: 0961-5539

Keywords

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Article

Maciej Mazur, Martin Leary, Matthew McMillan, Joe Elambasseril and Milan Brandt

Additive manufacture (AM) such as selective laser melting (SLM) provides significant geometric design freedom in comparison with traditional manufacturing methods. Such…

Abstract

Purpose

Additive manufacture (AM) such as selective laser melting (SLM) provides significant geometric design freedom in comparison with traditional manufacturing methods. Such freedom enables the construction of injection moulding tools with conformal cooling channels that optimize heat transfer while incorporating efficient internal lattice structures that can ground loads and provide thermal insulation. Despite the opportunities enabled by AM, there remain a number of design and processing uncertainties associated with the application of SLM to injection mould tool manufacture, in particular from H13/DIN 1.2344 steel as commonly used in injection moulds. This paper aims to address several associated uncertainties.

Design/methodology/approach

A number of physical and numerical experimental studies are conducted to quantify SLM-manufactured H13 material properties, part manufacturability and part characteristics.

Findings

Findings are presented which quantify the effect of SLM processing parameters on the density of H13 steel components; the manufacturability of standard and self-supporting conformal cooling channels, as well as structural lattices in H13; the surface roughness of SLM-manufactured cooling channels; the effect of cooling channel layout on the associated stress concentration factor and cooling uniformity; and the structural and thermal insulating properties of a number of structural lattices.

Originality/value

The contributions of this work with regards to SLM manufacture of H13 of injection mould tooling can be applied in the design of conformal cooling channels and lattice structures for increased thermal performance.

Details

Rapid Prototyping Journal, vol. 22 no. 3
Type: Research Article
ISSN: 1355-2546

Keywords

Content available
Article

Flavia Cristina Silva, Fabio Ytoshi Shibao, Isak Kruglianskas, José Carlos Barbieri and Paulo Antonio Almeida Sinisgalli

In total, 19 practices of circular economy divided into three groups, internal environmental management, ecological design and investment recovery were studied in a local…

Abstract

Purpose

In total, 19 practices of circular economy divided into three groups, internal environmental management, ecological design and investment recovery were studied in a local network composed of small companies and individual entrepreneurs related to common product and by-product flows. The paper aims to discuss these issues.

Design/methodology/approach

This research presents an applied nature, is characterized as exploratory and adopted the case study as a technical procedure using sources and methods of data collection. The primary data were collected through direct observation of the processes and semi-structured interviews with managers and owners.

Findings

The most widespread practices are related to product design. However, in most cases, the implementation was punctual and did not present continuous and corresponding actions, which highlights the embryonic contours of European Commission (EC) in the observed network. The practices from the management category were less observed, which revels the environmental variable is not included in the strategic business planning.

Research limitations/implications

The research documents the application of CE practices in a local network and brings this current paradigm shift to the Brazilian context.

Practical implications

To overcome barriers to the implementation of EC practices, it is suggested to restructure commercial relations, to formulate public policies and to develop infrastructures that facilitate the materiality of flows and the market.

Social implications

The study highlights the need of public policies that promotes cross-sectoral cooperation in accordance with NSWP objectives.

Originality/value

Despite the focus on EC implemented practices this study offers a framework of the research routes on the main barriers and suggests actions to overcome the challenges in the transition from the economy to the circular model.

Details

Revista de Gestão, vol. 26 no. 1
Type: Research Article
ISSN: 2177-8736

Keywords

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Article

Broto Rauth Bhardwaj

Green supply chain management (GSCM) has become the driver of sustainable strategy. This topic has been gaining increasing attention within both academia and industry for…

Abstract

Purpose

Green supply chain management (GSCM) has become the driver of sustainable strategy. This topic has been gaining increasing attention within both academia and industry for making the industry competitive. With the ever increasing demand for reducing carbon foot prints and greenhouse gas emission, there is a need to study the various parameters and drivers of sustainable development, especially in supply chain management. The need for developing the sustainable model including the drivers of sustainability needs to be designed. The paper aims to discuss these issues.

Design/methodology/approach

Using resource-based theory and value chain analysis; the authors have developed a model for sustainable strategy. The data were collected and analyzed to find the key drivers of sustainability. The data were analyzed with the help of regression and correlation analysis.

Findings

After providing a background discussion on GSCM, the authors categorize and review recent GSCM literature under three broad categories, with a special emphasis on investigation of adoption, diffusion, and outcomes of GSCM practices. Within this review framework, the authors also identified GSCM research questions that are worthy of investigation. The study suggests that the main drivers of GSCM include the environmental policy and the green human resource management by providing them training for adopting sustainability practices. Besides this, another key driver is the sustainability criteria in supplier selection which was found to be enhancing the outcomes of sustainability.

Research limitations/implications

The model suggests that we need to have management support for implementing the sustainability strategy in the organization.

Practical implications

The study guides the managers for implementing sustainable supply chain management practices in the organization.

Social implications

The model including the environment policy (adoption), green human resource management (diffusion), green technology (diffusion), and GSCM.

Originality/value

Additional organizational theories which are considered valuable for future GSCM research are also identified with a conclusion for this review.

Details

Benchmarking: An International Journal, vol. 23 no. 2
Type: Research Article
ISSN: 1463-5771

Keywords

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