Approaches to minimize overhang angles of SLM parts

2017 ◽  
Vol 23 (2) ◽  
pp. 362-369 ◽  
Author(s):  
Michael Cloots ◽  
Livia Zumofen ◽  
Adriaan Bernardus Spierings ◽  
Andreas Kirchheim ◽  
Konrad Wegener
Keyword(s):  
Process Parameters ◽  
Design Methodology ◽  
Processing Parameters ◽  
Internal Stresses ◽  
Support Structures ◽  
Laser Melting ◽  
Content Type ◽  
The Core ◽  
Processing Strategies ◽  
Process Heat

Purpose For geometries exhibiting overhanging surfaces, support structures are needed to dissipate process heat and to minimize geometrical distortions attributed to internal stresses. The use of support structures is often time- and cost-consuming. For this reason, this study aims to propose an approach which minimizes the use of such structures. Design/methodology/approach For minimizing the use of support structures, process parameters in combination with a contour-like exposure strategy are developed to realize support-less overhanging structures of less than 35°. These parameters are implemented in a shell-core strategy, which follows the idea of applying different processing strategies to the critical (overhanging) shell and the uncritical core of the part. Thereby, the core is processed with standard parameters, aiming a dense material. On the critical shell, optimized processing parameters are applied, reaching good results in terms of surface quality, especially at extreme overhang situations. Findings The results show that the selective laser melting (SLM) technology is able to realize support-less overhanging surfaces by choosing suitable scan strategies and process parameters. Particularly good results are always obtained when the exposure direction of the shell is parallel to the contour of the sample. Originality/value The validity of the results is demonstrated through the successful reproduction of the build strategy on two commercial SLM machines, reaching support-free builds of surfaces with an angle to the horizontal of less than or equal to 30°.

Who is a “Senior”? Looking for a definition in the healthcare system

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Monica Consolandi
Keyword(s):  
Quality Of Life ◽  
Health Care ◽  
Healthcare System ◽  
Health Care System ◽  
Design Methodology ◽  
Social Role ◽  
Content Type ◽  
The Core ◽  
Starting Point

Purpose Seniors are nowadays at the core of important reflections to understand both how to ensure them a proper quality of life and better recognize their social role, providing them services and proper health care to value them as persons and resources. This paper aims to find a through definition about who is a senior, in the author’s opinion the starting point to help them flourishing. Design/methodology/approach As an example of definitions, an online dictionary and two geriatric text-books are quoted, highlighting qualities and rights referred to seniors especially in the delicate context of the health-care system. Findings The lack of a commonly shared perspective on this delicate kind of patient entails the difficulty to reach a coherent and satisfying definition about who a senior is. Originality/value The lack of a commonly shared definition leads to inevitable misunderstandings and could explain the arduousness of considering seniors in all their aspects. Further investigations are suggested.

Deformations and stresses prediction of cantilever structures fabricated by selective laser melting process

2021 ◽  
Vol 27 (3) ◽  
pp. 453-464
Author(s):  
Lan Li ◽  
Tan Pan ◽  
Xinchang Zhang ◽  
Yitao Chen ◽  
Wenyuan Cui ◽  
...  
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Selective Laser Melting ◽  
Thermal Distortion ◽  
Cantilever Beams ◽  
Support Structures ◽  
Laser Melting ◽  
Content Type ◽  
Two Samples ◽  
Validation Experiments

Purpose During the powder bed fusion process, thermal distortion is one big problem owing to the thermal stress caused by the high cooling rate and temperature gradient. For the purpose of avoiding distortion caused by internal residual stresses, support structures are used in most selective laser melting (SLM) process especially for cantilever beams because they can assist the heat dissipation. Support structures can also help to hold the work piece in its place and reduce volume of the printing materials. The mitigation of high thermal gradients during the manufacturing process helps to reduce thermal distortion and thus alleviate cracking, curling, delamination and shrinkage. Therefore, this paper aims to study the displacement and residual stress evolution of SLMed parts. Design/methodology/approach The objective of this study was to examine and compare the distortion and residual stress properties of two cantilever structures, using both numerical and experimental methods. The part-scale finite element analysis modeling technique was applied to numerically analyze the overhang distortions, using the layer-by-layer model for predicting a part scale model. The validation experiments of these two samples were built in a SLM platform. Then average displacement of the four tip corners and residual stress on top surface of cantilever beams were tested to validate the model. Findings The validation experiments results of average displacement of the four tip corners and residual stress on top surface of cantilever beams were tested to validate the model. It was found that they matched well with each other. From displacement and residual stress standpoint, by introducing two different support structure, two samples with the same cantilever beam can be successfully printed. In terms of reducing wasted support materials, print time and high surface quality, sample with less support will need less post-processing and waste energy. Originality/value Numerical modeling in this work can be a very useful tool to parametrically study the feasibility of support structures of SLM parts in terms of residual stresses and deformations. It has the capability for fast prediction in the SLMed parts.

Outsourcing in startups

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fernanda Kalil Steinbruch ◽  
Bernardo Soares Fernandes ◽  
Leandro da Silva Nascimento ◽  
Paulo Antônio Zawislak
Keyword(s):  
Design Methodology ◽  
Development Stage ◽  
Attractive Alternative ◽  
Content Type ◽  
Core Business ◽  
Secondary Sources ◽  
The Core ◽  
Management Literature ◽  
Structure Knowledge

Purpose The purpose of this paper is to identify the main activities that startups outsource and the elements involved in outsourcing decisions. Design/methodology/approach A multi-case study composed of Brazilian startups was conducted. Data through interviews and secondary sources were obtained. Two groups of startups were considered and analyzed comparatively: startups in the development stage and in the sales stage. Findings The findings show that even though the literature suggests that the core business should not be outsourced, some startups do have to outsource this kind of activity. That was the main difference found between startups in the sales stage and in the development stage: the former group has a solid structure, knowledge and resources, so they can keep the core business inside the firm; whereas the latter group has little experience, scarce knowledge and resources, making outsourcing a more attractive alternative. Originality/value Theoretically, this paper approaches a perspective underexplored in the innovation and management literature: outsourcing in startups. It highlights how outsourcing, as a decision between making and buying, can help startups to improve success potential. In practice, this paper discusses and demonstrates why and what can be outsourced by startups in the development and in the sales stages to overcome their limitations and, consequently, achieve better innovative results.

scholarly journals Accountability reporting objectives of Māori organizations

2018 ◽  
Vol 30 (4) ◽  
pp. 433-443 ◽  
Author(s):  
Russell Craig ◽  
Rawiri Taonui ◽  
Susan Wild ◽  
Lũcia Lima Rodrigues
Keyword(s):  
New Zealand ◽  
Design Methodology ◽  
Indigenous Communities ◽  
Core Values ◽  
Annual Reports ◽  
Content Type ◽  
Cultural Activities ◽  
The Core ◽  
Regional Associations

Purpose This paper aims to highlight the accountability reporting objectives of four Māori-controlled organizations. The examples cited reflect the core values of the indigenous Māori people of New Zealand (Aotearoa) and help demonstrate how these values are manifest in the accountability reporting of Māori-controlled organizations. Design/methodology/approach Narrative sections of ten annual reports of two small and two large Maori organizations, drawn variously from their financial years ending in the calendar years 2009 to 2014, are read closely. These organizations represent diverse tribal and regional associations in terms of size, scope and structure; and in terms of the business, social and cultural activities they pursue. Findings Three core Māori values are identified: spirituality (wairuatanga); intergenerationalism and restoration (whakapapa); and governance, leadership and respect (mana and rangatiratanga). The commitment to these values and the way this commitment is reflected in accountability reports of Maori organizations, is presented. Originality/value The examples provided, and the associated discussion, should help inform reporting initiatives of organizations that are seeking better accountability in terms of their long-term engagement with indigenous communities, the environment and broader society.

scholarly journals Re-orienting the paradigm: path dependence in FDI theory and the emerging multinationals

2019 ◽  
Vol 14 (1) ◽  
pp. 51-69 ◽  
Author(s):  
Jan Knoerich
Keyword(s):  
Emerging Economies ◽  
Direct Investment ◽  
Design Methodology ◽  
Path Dependence ◽  
Theoretical Perspective ◽  
Multinational Enterprise ◽  
Content Type ◽  
The Core ◽  
Emerging Multinationals ◽  
Path Dependent

Purpose The purpose of this paper is to analyze how path dependence in the evolution of major theories of foreign direct investment (FDI) locked in a theoretical perspective of the multinational enterprise that focused on asset-exploitation. This perspective is challenged by recent contradicting observations of multinationals from China and other emerging economies. A decisive re-orientation of FDI theory is proposed as a way forward to resolve this tension. Design/methodology/approach Placing FDI theories into the context of FDI patterns prevailing at the time they were developed, Thomas Kuhn’s framework on the evolution of scientific knowledge is employed to track how the mainstream FDI theory emerged, went through a period of normal science and then approached a crisis of science in this field. Findings The evolution of FDI theory is strongly path-dependent, which made it difficult for theory to effectively incorporate new conceptual discoveries and empirical findings about the nature of FDI activity. Originality/value FDI theory would benefit from a full re-orientation to a demand-oriented perspective which places the pursuit of advantages, assets, resources, etc., at the core of the theory. Such a change is implicit in many recent theoretical advances and would assure theory is generalizable to all types of FDI.

Towards a framework for performing outsourcing capability

2014 ◽  
Vol 7 (3) ◽  
pp. 226-252 ◽  
Author(s):  
Sankalp Pratap
Keyword(s):  
Conceptual Framework ◽  
Design Methodology ◽  
Optimal Management ◽  
Organizational Processes ◽  
Ongoing Activity ◽  
Content Type ◽  
Fast Growing ◽  
The Core ◽  
Successes And Failures

Purpose – The aim of this paper is to go beyond the “What to outsource” and “To Outsource or Not” debate. Recognizing outsourcing as a fast growing reality that firms have to depend upon, the paper concerns itself with optimal management of outsourcing arrangements through the practice of “outsourcing capability”. It argues that outsourcing failure can be mitigated if organizations see outsourcing as an “ongoing activity” to be managed as opposed to treating it as a one-time opportunistic “act”. Design/methodology/approach – Based on the review of existing literature and drawing upon recent instances of outsourcing successes and failures, the paper develops a conceptual framework which divides various organizational processes into four different classes. It delineates the varied aspects of “outsourcing capability” that a firm would need to use to manage these varied class of processes as and when they are outsourced. Findings – There is no “one-size-fits-all” approach to managing outsourced processes. Different processes require emphasis on different aspect of outsourcing capability if outsourcing is to deliver the envisaged benefits. Originality/value – The traditional focus in outsourcing literature has been on the core/non-core process with the recommendation to keep core processes in-house and outsource the non-core processes. This distinction can be transitory and hence detrimental in the era of hyper-competition. I argue that firms should instead focus on developing and refining aspects of “outsourcing capability” relevant to the varied class of processes that they wish/need to outsource.

Why do organizations share their most important capital? The provision of an open innovation model based on human capital

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Elham Sahami ◽  
Ali Safari ◽  
Reza Ansari ◽  
Ali Shaemi Barzoki
Keyword(s):  
Human Capital ◽  
Open Innovation ◽  
Design Methodology ◽  
Social Aspects ◽  
Structured Interviews ◽  
Final Model ◽  
Content Type ◽  
The Core ◽  
Innovation Model ◽  
Inside Out

Purpose In this study, an open innovation (OI) model was designed in which the organization’s human resource systems comprise the main core. To identify the various dimensions of the model, this study aims to investigate how and under what conditions the organizations update and upgrade their knowledge and experiences in the human capital (HC) systems domain within the OI framework and in line with sharing them with other organizations. Design/methodology/approach In this qualitative study, the data were collected by means of semi-structured interviews and analyzed through grounded theory, which led to the extraction of the final model. Findings The implementation of the HC-based OI helps upgrade knowledge in the organization and industry knowledge, create win-win relationships and increase the interaction capital, power and credit of the organization. Originality/value In this study, HC systems have been regarded as the core of the OI model (rather than an intervening factor in OI). This is the main innovative aspect of the current study. In addition, the special attention paid to the inside-out approach to OI and the examination of the human and social aspects of inter-organizational knowledge sharing – particularly in the light of the fact that the study was carried out in a developing country – are the other innovative aspects of this study.

On dialectics in theorizing: the contingent nature of organizational learning

2020 ◽  
Vol 28 (4) ◽  
pp. 957-968
Author(s):  
Norman Meisinger
Keyword(s):  
Organizational Learning ◽  
Design Methodology ◽  
Content Type ◽  
The Core ◽  
The Past ◽  
Conceptual Study

Purpose During the past decades, numerous contributions to organizational learning have emerged. However, these theories are plagued by the same paradoxical core that prevents organizational learning from being unambiguously determined or stably located throughout the entire organization and its individuals. The purpose of this paper is to understand how researchers approach this issue. Design/methodology/approach Through a meta-lens, this conceptual study observes how researchers are taming the paradox of organizational learning, referring exclusively to the theories that deal with its inherent paradox. Findings The author distinguishes fundamentally different theorizing strategies. Therefore, the paper aims not to sharpen the elusive and fuzzy nature of organizational learning but to sharpen the elusive understanding that its nature is fuzzy. As a consequence, the study further emphasizes how challenging an instrumental use of the academic construct of organizational learning for practicing managers outside research laboratories is. Originality/value The paper contributes (first) to the core understanding of the inherently conflicting construct of organizational learning by (second) uncovering the dialectics of the theories concerning it – the former only becomes feasible as a result of the latter.

scholarly journals Airline passengers’ perceptions of service quality: themes in online reviews

2019 ◽  
Vol 31 (2) ◽  
pp. 855-873 ◽  
Author(s):  
Ana Brochado ◽  
Paulo Rita ◽  
Cristina Oliveira ◽  
Fernando Oliveira
Keyword(s):  
Social Media ◽  
Design Methodology ◽  
Online Reviews ◽  
Value For Money ◽  
Content Type ◽  
The Core ◽  
Content Analyses ◽  
Airline Passengers ◽  
Media Platform ◽  
Post Purchase

PurposeThis paper aims to identify the main themes shared in online reviews by airline travellers, as well as which of these themes were linked with higher and lower value for money ratings.Design/methodology/approachThe research used mixed content analyses (i.e. quantitative and qualitative) to examine 1,200 reviews of six airline companies shared by airline travellers in a social media platform.FindingsThe analyses revealed nine themes in descriptions of airline travel experiences. These are the core services during “flights”, “airport” operations, crew and ground “staff”, ticket “classes”, “seats”, inflight “services”, “entertainment”, overall experiences of “airlines” and post-purchase recommendations of with which companies to “fly”. Low value for money ratings are linked with the “airport” and “flights” themes.Originality/valueThe results offer useful insights into airline travellers’ overall experiences based on social media information and facilitate the identification of the main themes linked with different value for money ratings.

scholarly journals The use of product scarcity in marketing

2020 ◽  
Vol 54 (2) ◽  
pp. 380-418 ◽  
Author(s):  
Xiaohui Shi ◽  
Feng Li ◽  
Pattarin Chumnumpan
Keyword(s):  
Systematic Review ◽  
Design Methodology ◽  
Future Research ◽  
Key Factors ◽  
Research Papers ◽  
Diverse Range ◽  
Content Type ◽  
The Core ◽  
New Directions ◽  
Business And Management

Purpose As a frequently observed business phenomenon, the use of product scarcity to improve a product’s market performance has received increasing attention from both academics and practitioners. The resulting literature has covered a wide variety of issues based on various theories, using different research methods, in a diverse range of settings. However, this diversity also makes it difficult to grasp the core themes and findings, and to see the outstanding knowledge gaps. This paper aims to review previous studies on the use of product scarcity in marketing and identifies new directions for future research. Design/methodology/approach A systematic review was conducted to identify and analyse 66 research papers published in business and management journals between 1970 and 2017. Findings The authors examined the underlying theories of scarcity-based marketing, and developed a conceptual framework that describes the key factors of product scarcity and how they influence both consumers and the market. They also highlighted some key achievements in modelling the processes involved in using product scarcity in marketing. Originality/value This analysis of the identified papers suggests that there are substantial gaps in our knowledge of this field, which opens up new paths for future research. For future research, the authors identified three directions aimed at: addressing the practical needs of firms in understanding product scarcity; guiding the implementation of scarcity-based strategies; and measuring, monitoring and predicting the level of product scarcity and its impacts during implementation.

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