Improving the forming quality of fused filament fabrication parts by applied vibration

2020 ◽  
Vol 26 (1) ◽  
pp. 202-212 ◽  
Author(s):  
Shijie Jiang ◽  
Yannick Siyajeu ◽  
Yinfang Shi ◽  
Shengbo Zhu ◽  
He Li
Keyword(s):  
Damping Ratio ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Future Research ◽  
Fused Filament Fabrication ◽  
Forming Quality ◽  
Content Type ◽  
Application Range

Purpose The purpose of this study is to investigate the efficiency of applied vibration in improving the forming quality (mechanical property and dynamics characteristics) of fused filament fabrication (FFF) parts. Design/methodology/approach A vibrating FFF three-dimensional printer was set up, with which the samples fabricated in different directions were manufactured separately without and with vibration applied. A series of experimental tests, including tensile tests, dynamics tests and scanning electron microscopy (SEM) tests, were performed on these samples to experimentally quantify the effect of applied vibration on their forming quality. Findings It has been found that the applied vibration can significantly increase the tensile strength and plasticity of the samples built in Z-direction, and obviously decrease the orthogonal anisotropy. It can also significantly change the sample’s natural frequency, decrease the resonant response and increase the modal damping ratio, thus improve the anti-vibration capability of FFF samples. In addition, the SEM analysis confirmed that applying vibration into FFF process could improve the forming quality of the fabricated part. Research limitations/implications Future research may be focused on investigating the efficiency of applied vibration in improving the forming quality of parts fabricated by the other additive manufacturing techniques. Practical implications This study helps to improve the reliability of FFF parts and extend the application range of FFF technology. Originality/value A novel method to improve the forming quality of FFF parts is provided and the available information about the performance of dynamics characteristics.

Suzhi development: indigenous approaches to enhancing the quality of human resources

2014 ◽  
Vol 5 (2) ◽  
pp. 115-128 ◽  
Author(s):  
Connie Zheng
Keyword(s):  
Human Capital ◽  
Historical Context ◽  
Three Dimensional ◽  
Human Capital Theory ◽  
Future Research ◽  
Capital Theory ◽  
Content Type ◽  
Political Sciences ◽  
Key Dimensions

Purpose – This paper aims to examine the Chinese indigenous concept of suzhi (素质) by analyzing its historical evolution and its contemporary implications for human resource management (HRM) research and practice at the national and organizational levels. Design/methodology/approach – An integrated review of literatures in sinology, political science, anthropology and sociology concerned with suzhi-related research, combined with recent incidents associated with suzhi. Findings – Suzhi is an indigenous concept embedded in the centuries-long historical context of China. Suzhi development has been focused on three key dimensions, moral, physical and mental, as a way of building quality employees and citizens. Yet developing and quantifying the moral aspects of suzhi is more challenging than measuring its physical and mental dimensions. Linking suzhi development to human capital theory enriches the understanding of this indigenous concept at both organizational and national levels. Research limitations/implications – By analyzing a three-dimensional suzhi composite, the article offers an example of how suzhi may be linked to human capital theory and identifies directions for future research. Originality/value – By analyzing suzhi at organizational and national levels for HRM purposes, this article broadens the suzhi literature from its place in the political sciences and social anthropology to encompass a theoretical analysis in HRM and development for the benefit of organizations and the society.

Fused filament printing of specialized biomedical devices: a state-of-the art review of technological feasibilities with PEEK

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Erfan Rezvani Ghomi ◽  
Saeideh Kholghi Eshkalak ◽  
Sunpreet Singh ◽  
Amutha Chinnappan ◽  
Seeram Ramakrishna ◽  
...  
Keyword(s):  
High Performance ◽  
State Of The Art ◽  
Three Dimensional ◽  
Patient Specific ◽  
Biomedical Devices ◽  
Fused Filament Fabrication ◽  
Content Type ◽  
Patient Specific Implants ◽  
Complex Design ◽  
Wide Range

Purpose The potential implications of the three-dimensional printing (3DP) technology are growing enormously in the various health-care sectors, including surgical planning, manufacturing of patient-specific implants and developing anatomical models. Although a wide range of thermoplastic polymers are available as 3DP feedstock, yet obtaining biocompatible and structurally integrated biomedical devices is still challenging owing to various technical issues. Design/methodology/approach Polyether ether ketone (PEEK) is an organic and biocompatible compound material that is recently being used to fabricate complex design geometries and patient-specific implants through 3DP. However, the thermal and rheological features of PEEK make it difficult to process through the 3DP technologies, for instance, fused filament fabrication. The present review paper presents a state-of-the-art literature review of the 3DP of PEEK for potential biomedical applications. In particular, a special emphasis has been given on the existing technical hurdles and possible technological and processing solutions for improving the printability of PEEK. Findings The reviewed literature highlighted that there exist numerous scientific and technical means which can be adopted for improving the quality features of the 3D-printed PEEK-based biomedical structures. The discussed technological innovations will help the 3DP system to enhance the layer adhesion strength, structural stability, as well as enable the printing of high-performance thermoplastics. Originality/value The content of the present manuscript will motivate young scholars and senior scientists to work in exploring high-performance thermoplastics for 3DP applications.

Hospital information systems in developing countries: a state-of-the-art systematic review

Kybernetes ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jie Lei ◽  
Jianming Liu ◽  
Wu Li
Keyword(s):  
Health Care ◽  
Information System ◽  
Developing Countries ◽  
Health Care Services ◽  
Developed Countries ◽  
Future Research ◽  
Local Conditions ◽  
Content Type ◽  
The Government

Purpose Hospital information system (HIS) can be examined as a vital factor for developing the quality of health care and cost managing. There exists abundant literature on HISs, but implementation-based literature of HIS is rare, typically about progressive countries. However, a study that can comprehensively review published articles is scarce. Therefore, this paper aims to examine the systematic and comprehensive study of HIS in developed countries. Together, the benefits and harms relevant to HIS’s different mechanisms have been considered, and the fundamental challenges of them are addressed to design more efficient HIS in the future. Design/methodology/approach HIS has been used globally for numerous years and is now being used in a wide area. HIS is broadly used in clinical settings. Information technology (IT) and information system have been suggested as a required piece to solve the health-care-related issues. Hence, to improve HIS’s ability, this paper conducted a review method concentratating on research related to HIS until 2019. A total of 21 papers were recognized and examined as principal research for the summary. Findings The authors found that HIS can help in reduction of medical mistakes, enhancement doctors’ performance and increase in the quality of the care provided. HIS management can be used to provide better health-care services. Therefore, HIS must be sensible and use clear structures. The authors conclude that, generally, with an increase in awareness, acceptability and the need for HIS worldwide, there will be more strategies and approaches available. Research limitations/implications First, this paper provides an outline of the status of HIS. Second, it identifies some distinct research gaps that could be worth studying. Some flawless work may be removed because of applying some filters to select the original articles. Surveying all the papers on the topic of HIS is impossible, too. Practical implications Design and sustainability of HIS is still a big issue for most developing countries, despite its wide usage in the developed countries. The technology is changing rapidly, so the field should be reviewed regularly. This paper suggests a suitable framework that will guide HIS in the local conditions of developing countries. Social implications The government will be assisted by the suggested solving ways in its performance and design of electronic health-care projects. Originality/value The study brings the viewpoints on the state of HIS mechanisms in developing countries. The paper’s results can offer visions into future research requirements. By providing comparative information and analyzing the current growths in this area, this study will support researchers and professionals to understand the progress in HIS mechanisms better.

scholarly journals Assessing the quality of collaboration towards the achievement of Sustainable Energy Innovation in PFI school projects

2015 ◽  
Vol 8 (3) ◽  
pp. 408-440 ◽  
Author(s):  
Sulafa M. Badi ◽  
Stephen D Pryke
Keyword(s):  
Public Sector ◽  
Private Sector ◽  
Sustainable Energy ◽  
Primary Data ◽  
Future Research ◽  
Limited Attention ◽  
Structured Interviews ◽  
Content Type ◽  
Energy Innovation

Purpose – The purpose of this paper is to examine the quality of collaboration towards Sustainable Energy Innovation (SEI) in Private Finance Initiative (PFI) projects. While the capacity of PFI to encourage collaboration towards innovation is largely advocated by its proponents; however, it remains to be supported by empirical evidence. Design/methodology/approach – Adopting the Complex Product System (CoPS) innovation management model, the authors assess the quality of collaboration at the interface between the innovation superstructure of public sector clients and users, and the innovation infrastructure of private sector designers, contractors and operators. Two interactional elements are examined upon which the quality of collaboration is assessed: openness of communication and alignment of objectives. The authors apply the model to four new-built PFI school projects within the context of the UK government Building Schools for the Future Programme. Semi-structured interviews with total of 50 key stakeholders were used as the primary data collection method. Findings – PFI has introduced a number of problematic issues weakening collaborative efforts towards innovation in the project environment. Particularly, the study underlines the restricting internal contractual relationships within the integrated Project Company and the misalignment of Design-Construction-Operation sustainability objectives. It also highlights ineffective communication with public sector clients and users brought in by the restricted nature of PFI engagement processes as well as the misalignment of public sector-private sector sustainability objectives. Research limitations/implications – The qualitative nature of the chosen research methodology limits the ability to generalise. The research findings need to be confirmed or rejected by means of quantitative research as representative of all PFI projects. Practical implications – The study emphasizes the public authority’s role in relation to providing the necessary conditions for the creation of a collaborative environment conducive to SEI in PFI projects. Originality/value – The study was able to expand the understanding of innovation and collaboration management processes in PFI projects in three respects: First, addressing the limited attention to innovation in PFI research, the study is the first to examine the quality of collaboration in PFI projects towards the implementation SEI. Second, examining the quality of collaboration in PFI projects through the lens of CoPS provides a new understanding of sustainability innovation and strongly indicates that the CoPS model should be expanded to account for the dynamics of innovation processes in the procurement of sustainable CoPS. Third, the explorative nature of the study was useful in generating research hypotheses that can form the basis for future research on SEI in PFI projects.

Restaurant and foodservice research

2017 ◽  
Vol 29 (4) ◽  
pp. 1203-1234 ◽  
Author(s):  
Robin DiPietro
Keyword(s):  
Past Research ◽  
Future Research ◽  
Research Papers ◽  
Content Type ◽  
The Past ◽  
Restaurant Management ◽  
Foodservice Industry ◽  
Future Direction

Purpose The purpose of this paper is to present a review of the foodservice and restaurant literature that has been published over the past 10 years in the top hospitality and tourism journals. This information will be used to identify the key trends and topics studied over the past decade, and help to identify the gaps that appear in the research to identify opportunities for advancing future research in the area of foodservice and restaurant management. Design/methodology/approach This paper takes the form of a critical review of the extant literature that has been done in the foodservice and restaurant industries. Literature from the past 10 years will be qualitatively assessed to determine trends and gaps in the research to help guide the direction for future research. Findings The findings show that the past 10 years have seen an increase in the number of and the quality of foodservice and restaurant management research articles. The topics have been diverse and the findings have explored the changing and evolving segments of the foodservice industry, restaurant operations, service quality in foodservice, restaurant finance, foodservice marketing, food safety and healthfulness and the increased role of technology in the industry. Research limitations/implications Given the number of research papers done over the past 10 years in the area of foodservice, it is possible that some research has been missed and that some specific topics within the breadth and depth of the foodservice industry could have lacked sufficient coverage in this one paper. The implications from this paper are that it can be used to inform academics and practitioners where there is room for more research, it could provide ideas for more in-depth discussion of a specific topic and it is a detailed start into assessing the research done of late. Originality/value This paper helps foodservice researchers in determining where past research has gone and gives future direction for meaningful research to be done in the foodservice area moving forward to inform academicians and practitioners in the industry.

scholarly journals Customer experience challenges: bringing together digital, physical and social realms

2018 ◽  
Vol 29 (5) ◽  
pp. 776-808 ◽  
Author(s):  
Ruth N. Bolton ◽  
Janet R. McColl-Kennedy ◽  
Lilliemay Cheung ◽  
Andrew Gallan ◽  
Chiara Orsingher ◽  
...  
Keyword(s):  
Conceptual Framework ◽  
Social Presence ◽  
Dimensional Space ◽  
New Technology ◽  
Three Dimensional ◽  
Customer Experience ◽  
Service Robots ◽  
Service Research ◽  
Future Research ◽  
Content Type

PurposeThe purpose of this paper is to explore innovations in customer experience at the intersection of the digital, physical and social realms. It explicitly considers experiences involving new technology-enabled services, such as digital twins and automated social presence (i.e. virtual assistants and service robots).Design/methodology/approachFuture customer experiences are conceptualized within a three-dimensional space – low to high digital density, low to high physical complexity and low to high social presence – yielding eight octants.FindingsThe conceptual framework identifies eight “dualities,” or specific challenges connected with integrating digital, physical and social realms that challenge organizations to create superior customer experiences in both business-to-business and business-to-consumer markets. The eight dualities are opposing strategic options that organizations must reconcile when co-creating customer experiences under different conditions.Research limitations/implicationsA review of theory demonstrates that little research has been conducted at the intersection of the digital, physical and social realms. Most studies focus on one realm, with occasional reference to another. This paper suggests an agenda for future research and gives examples of fruitful ways to study connections among the three realms rather than in a single realm.Practical implicationsThis paper provides guidance for managers in designing and managing customer experiences that the authors believe will need to be addressed by the year 2050.Social implicationsThis paper discusses important societal issues, such as individual and societal needs for privacy, security and transparency. It sets out potential avenues for service innovation in these areas.Originality/valueThe conceptual framework integrates knowledge about customer experiences in digital, physical and social realms in a new way, with insights for future service research, managers and public policy makers.

Experimental study on the accuracy and surface quality of printed versus machined holes in PEI Ultem 9085 FDM specimens

2021 ◽  
Vol 27 (11) ◽  
pp. 1-12
Author(s):  
Giovanni Gómez-Gras ◽  
Marco A. Pérez ◽  
Jorge Fábregas-Moreno ◽  
Guillermo Reyes-Pozo
Keyword(s):  
Surface Quality ◽  
Fused Deposition Modeling ◽  
Three Dimensional ◽  
Dimensional Accuracy ◽  
Technological Parameters ◽  
Content Type ◽  
Fused Deposition ◽  
Comparison Of The Results ◽  
Through Hole

Purpose This paper aims to investigate the quality of printed surfaces and manufacturing tolerances by comparing the cylindrical cavities machined in parts obtained by fused deposition modeling (FDM) with the holes manufactured during the printing process itself. The comparison focuses on the results of roughness and tolerances, intending to obtain practical references when making assemblies. Design/methodology/approach The experimental approach focuses on the comparison of the results of roughness and tolerances of two manufacturing strategies: geometric volumes with a through-hole and the through-hole machined in volumes that were initially printed without the hole. Throughout the study, both alternates are explained to make appropriate recommendations. Findings The study shows the best combinations of technological parameters, both machining and three-dimensional printing, which have been decisive for obtaining successful results. These conclusive results allow enunciating recommendations for use in the industrial environment. Originality/value This paper fulfills an identified need to study the dimensional accuracy of the geometries obtained by additive manufacturing, as no experimental evidence has been found of studies that directly address the problem of the FDM-printed part with geometric and dimensional tolerances and desirable surface quality for assembly.

Fused filament fabrication of continuous optic fiber reinforced polylactic acid composites

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Rui Yan ◽  
Yuye Wang ◽  
Pengjun Luo ◽  
Yangbo Li ◽  
Xiaochun Lu
Keyword(s):  
Polylactic Acid ◽  
Three Dimensional ◽  
Underlying Mechanism ◽  
Uniaxial Tensile ◽  
Optic Fiber ◽  
Fiber Reinforced ◽  
Fused Filament Fabrication ◽  
Engineering Applications ◽  
Content Type ◽  
Axial Tensile

Purpose The limited strength of polylactic acid (PLA) hinders its extensive engineering applications. This paper aims to enhance its strength and realize diverse applications. Design/methodology/approach Here, the continuous fiber reinforced PLA composites are fabricated by a customized fused filament fabrication three-dimensional printer. Uniaxial tensile and three-point flexural tests have been conducted to analyze the reinforcement effect of the proposed composites. To unveil the adhering mechanism of optic fiber (OF) and PLA, post failure analysis including the micro imaging and morphology have been performed. The underlying mechanism is that the axial tensile strength of the OF and the interfacial adhesion between PLA and OF compete to enhance the mechanical properties of the composite. Findings It is found that 10%–20% enhancement of strength, ductility and toughness due to the incorporation of the continuous OF. Originality/value The continuous OFs are put into PLA first time to improve the strength. The fabrication method and process reported here are potentially applied in such engineering applications as aerospace, defense, auto, medicine, etc.

An expanded nomological network of experienscape

2020 ◽  
Vol 32 (3) ◽  
pp. 999-1040 ◽  
Author(s):  
Asli D.A. Tasci ◽  
Abraham Pizam
Keyword(s):  
Quality Of Life ◽  
Well Being ◽  
Future Research ◽  
Subjective Happiness ◽  
Subjective Well Being ◽  
Nomological Network ◽  
Multiple Stakeholders ◽  
Content Type ◽  
Holistic Understanding

Purpose Bitner’s (1992) concept of servicescape has received widespread academic attention, resulting in many conceptual and empirical studies. By scanning the servicescape literature and other relevant concepts, Pizam and Tasci (2019) provided experienscape, an expanded version of servicescape, to be measured from different stakeholders’ perspectives with a multidisciplinary approach. This paper aims to build on Pizam and Tasci’s conceptualization of experienscape and expand its nomological network with other pertinent concepts related to different stakeholders with an interdisciplinary approach. Design/methodology/approach This is a conceptual study analyzing diverse literature related to servicescape, experienscape and other related concepts and theories to provide an integrated and holistic picture of experienscape for more robust theory development. Several new relationships are synthesized for hypothesis development and testing in future research. Findings The review of past research reveals that servicescape literature has mostly focused on outcomes for the benefit of brands and firms and missed outcomes for consumers and other stakeholders. In addition, servicescape literature lacks several critical concepts in the affective, cognitive and behavioral reaction domains, as well as moderator factors. The relevance of some theories such as branding (e.g. brand identity, personality, image, perceived quality, consumer value, brand value and self-congruity), cocreation/coproduction/codestruction, transformation, subjective happiness, subjective well-being and quality of life is completely overlooked. Research limitations/implications Experienscape is a container of complex systems where needs, wants and expectations of multiple stakeholders are entertained, often at the same time through dynamic interactions among multiple stakeholders. Thus, a holistic understanding of experienscape requires dynamic integration of theories explaining the behavior of different stakeholders by cross-fertilizing theories through interdisciplinary research rather than unidisciplinary or multidisciplinary research conducted in separate silos. Originality/value By adopting Pizam and Tasci’s (2019) experienscape concept, this study expanded the relational network of service environment components (i.e. sensory, functional, social, natural and cultural components of experienscape) by incorporating diverse theories and concepts that explain cognitive, affective and conative reactions of different stakeholders to an experience environment. Additionally, the current study recommends attention to human-centric outcomes such as transformation, subjective well-being, subjective happiness and quality of life, which were completely overlooked in previous servicescape research.

Effect of extrusion temperature on fused filament fabrication parts orthotropic behaviour

2019 ◽  
Vol 26 (4) ◽  
pp. 639-647
Author(s):  
Michele Angelo Attolico ◽  
Caterina Casavola ◽  
Alberto Cazzato ◽  
Vincenzo Moramarco ◽  
Gilda Renna
Keyword(s):  
Mechanical Properties ◽  
Morphological Characteristics ◽  
Single Layer ◽  
Acrylonitrile Butadiene Styrene ◽  
Surface Characteristics ◽  
Tensile Tests ◽  
Extrusion Temperature ◽  
Fused Filament Fabrication ◽  
Bonding Quality ◽  
Content Type

Purpose The purpose of this paper is to verify the effects of extrusion temperature on orthotropic behaviour of the mechanical properties of parts obtained by fused filament fabrication (FFF) under quasi-static tensile loads. Design/methodology/approach Tensile tests were performed on single layer specimens fabricated in polylactic acid (PLA) and acrylonitrile butadiene styrene (ABS) to evaluate the mechanical properties at different extrusion temperatures and raster orientations (0°, 45° and 90°). Furthermore, a detailed study of morphological characteristics of the single layer samples cross-section and of the bonding quality among adjacent deposited filaments was performed by scanning electron microscopy to correlate the morphology of materials with mechanical behaviour. Findings The results show that the orthotropic behaviour of FFF-printed parts tends to reduce, while the mechanical properties improved with increase in extrusion temperature. Furthermore, the increase in extrusion temperature led to an improvement in inter-raster bonding quality and in the compactness and homogeneity of the parts. Originality/value The relation between the extrusion temperature, orthotropic behaviour and morphological surface characteristics of the single layer specimen obtained by FFF has not been previously reported.

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