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Article
Publication date: 26 April 2023

Mudassar Rehman, Yanen Wang, Kashif Ishfaq, Haiou Yang, Ray Tahir Mushtaq, M. Saravana Kumar and Ammar Ahmed

Since the biomedical implants with an improved compressive strength, near bone elastic modulus, controlled porosity, and sufficient surface roughness, can assist in long term…

289

Abstract

Purpose

Since the biomedical implants with an improved compressive strength, near bone elastic modulus, controlled porosity, and sufficient surface roughness, can assist in long term implantation. Therefore, the fine process tuning plays its crucial role to develop optimal settings to achieve these desired properties. This paper aims to find applications for fine process tuning in laser powder bed fusion of biomedical Ti alloys for load-bearing implants.

Design/methodology/approach

In this work, the parametric porosity simulations were initially performed to simulate the process-induced porosity for selective laser-melted Ti6Al4V as per full factorial design. Continually, the experiments were performed to validate the simulation results and perform multiresponse optimization to fine-tune the processing parameters. Three levels of each control variable, namely, laser power – Pl (180, 190, 200) W, scanning speed – Vs (1500, 1600, 1700) mm/s and scan orientation – ϴ{1(0,0), 2(0,67°), 3(0,90°)} were used to investigate the processing performance. The measured properties from this study include compressive yield strength, elastic modulus, process-induced porosity and surface roughness. Finally, confirmatory experiments and comparisons with the already published works were also performed to validate the research results.

Findings

The results of porosity parametric simulation and experiments in selective laser melting of Ti6Al4V were found close to each other with overall porosity (less than 10%). The fine process tuning was resulted in optimal settings [Pl (200 W), Vs (1500 mm/s), ϴ (0,90°)], [Pl (200 W), Vs (1500 mm/s), ϴ (0,67°)], [Pl (200 W), Vs (1500 mm/s), ϴ (0,0)] and [Pl (200 W), Vs (1500 mm/s), ϴ (0,0)] with higher compressive strength (672.78 MPa), near cortical bone elastic modulus (12.932 GPa), process-induced porosity (0.751%) and minimum surface roughness (2.72 µm). The morphology of the selective laser melted (SLMed) surface indicated that the lack of fusion pores was prominent because of low laser energy density among the laser and powder bed. Confirmatory experimentation revealed that an overall percent improvement of around 15% was found between predicted and the experimental values.

Originality/value

Since no significant works are available on the collaborative optimization and fine process tuning in laser powder bed fusion of biomedical Ti alloys for different load bearing implants. Therefore, this work involves the comprehensive investigation and multi-objective optimization to determine optimal parametric settings for better mechanical and physical properties. Another novel aspect is the parametric porosity simulation using Ansys Additive to assist in process parameters and their levels selection. As a result, selective laser melted Ti alloys at optimal settings may help in examining the possibility for manufacturing metallic implants for load-bearing applications.

Details

Rapid Prototyping Journal, vol. 29 no. 6
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 25 October 2021

Yanen Wang, Ray Tahir Mushtaq, Ammar Ahmed, Ammar Ahmed, Mudassar Rehman, Mudassar Rehman, Aqib Mashood Khan, Shubham Sharma, Dr Kashif Ishfaq, Haider Ali and Thierno Gueye

Additive manufacturing (AM) technology has a huge influence on the real world because of its ability to manufacture massively complicated geometrics. The purpose of this study is…

485

Abstract

Purpose

Additive manufacturing (AM) technology has a huge influence on the real world because of its ability to manufacture massively complicated geometrics. The purpose of this study is to use CiteSpace (CS) visual analysis to identify fused deposition modeling (FDM) research and development patterns to guide researchers to decide future research and provide a framework for corporations and organizations to prepare for the development in the rapid prototyping industry. Three-dimensional printing (3DP) is defined to budget minimize manufactured input and output for aviation and the medical product industrial sectors. 3DP has implemented its potential in the Coronavirus Disease of 2019 (COVID-19) reaction.

Design/methodology/approach

First, 396 original publications were extracted from the web of science (WOS) with the comprehensive list and did scientometrics analysis in CS software. The parameters are specified in CS including the span (from 2011 to 2019, one year slice for the co-authorship and the co-accordance analysis), visualization (show the merged networks), specific criteria for selection (top 20%), node form (author, organization, region, reference cited; cited author, journal and keywords) and pruning (pathfinder and slicing network). Finally, correlating data was studied and showed the results of the visualization study of FDM research were shown.

Findings

The framework of FDM information is beginning to take shape. About hot research topics, there are “Morphology,” “Tensile Property by making Blends,” “Use of Carbon nanotube in 3DP” and “Topology optimization.” Regarding the latest research frontiers of FDM printing, there are “Fused Filament Fabrication,” “AM,” in FDM printing. Where “Post-processing” and “environmental impact” are the research hotspots in FDM printing. These research results can provide insight into FDM printing and useful information to consider the existing studies and developments in FDM researchers’ analysis.

Research limitations/implications

Despite some important obtained results through FDM-related publications’ visualization, some deficiencies remain in this research. With >99% of articles written in English, the input data for CS was all downloaded from WOS databases, resulting in a language bias of papers in other languages and neglecting other data sources. Although, there are several challenges being faced by the FDM that limit its wide variety of applications. However, the significance of the current work concerning the technical and engineering prospects is discussed herein.

Originality/value

First, the novelty of this work lies in describing the FDM approach in a Scientometric way. In Scientometric investigation, leading writers, organizations, keywords, hot research and emerging knowledge points were explained. Second, this research has thoroughly and comprehensively examined the useful sustainability effects, i.e. economic sustainability, energy-based sustainability, environmental sustainability, of 3DP in industrial development in qualitative and quantitative aspects by 2025 from a global viewpoint. Third, this work also described the practical significance of FDM based on 3DP since COVID-19. 3DP has stepped up as a vital technology to support improved healthcare and other general response to emergency situations.

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Article
Publication date: 28 July 2021

Hira Rani, Syed Mir Muhammad Shah, Waheed Ali Umrani, Jawad Syed and Gul Afshan

Utilizing affective event theory (AET), this paper aims to understand the affective reasoning behind choosing to speak up for or against abusive supervision. For this purpose, the…

877

Abstract

Purpose

Utilizing affective event theory (AET), this paper aims to understand the affective reasoning behind choosing to speak up for or against abusive supervision. For this purpose, the authors examine the underlying mechanism of employee state paranoia in the relationship between abusive supervision and promotive and prohibitive voice of employees.

Design/methodology/approach

Data from 307 microfinance bank employees were collected using supervisor–subordinate nested design and time-lag approach. The analysis was performed through partial least square (PLS) structural equation modeling using Smart PLS software.

Findings

The results support the direct relationship of abusive supervision with promotive and prohibitive voice. They also support the mediating relation of paranoia arousal between abusive supervision and promotive voice. However, the results do not support the mediating relationship of paranoia arousal between abusive supervision and prohibitive voice.

Originality/value

In light of the literature drawn from AET and empirical data, this study forwards robust recommendations for theory and practice and may assist future researchers interested in the role of employee paranoia arousal.

Details

Leadership & Organization Development Journal, vol. 42 no. 7
Type: Research Article
ISSN: 0143-7739

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Article
Publication date: 5 December 2023

Sobia Nasir, Nadia Nasir, Shabnam Khan, Waqas Khan and Server Sevil Akyürek

The study aims to describe the impact of supervisor’s and co-worker’s ostracism on the employee's responses (emotional, psychological and behavioral) through the mediation of…

393

Abstract

Purpose

The study aims to describe the impact of supervisor’s and co-worker’s ostracism on the employee's responses (emotional, psychological and behavioral) through the mediation of employees' efficacy needs and relational needs. Moreover, psychological capital is treated as a moderator to handle the adverse responses of ostracized employees.

Design/methodology/approach

The study employed a three-wave quantitative research design to gather data from employees and their respective supervisors who belonged to various healthcare units (N = 510) using self-administered close-ended questionnaires. After that, SmartPLS software was used to analyze the data through a structured equation modeling (SEM) technique.

Findings

The empirical results of the study endorsed that ostracism adversely (negatively) affects employees' responses (comprised of emotional, behavioral and psychological). Moreover, the results revealed that employees' needs (efficacy and relational) mediate the relationship between ostracism experienced by employees (supervisor’ and co-workers’ ostracism) and their emotional, behavioral and psychological responses. In addition, it is also evidenced that employees' psychological capital improves the negative association between employees' needs and responses.

Originality/value

The literature in this domain is scarce, and the theoretical stance is weak due to the traditional approaches that are more concerned with the outcomes rather than analyzing the employee's conditional what they are going through. The present study enhances the knowledge of the transactional mode of coping and its application to ostracism in the workplace. The results of the current study may also support the practitioners in formulating interventions to foster a favorable workplace environment.

Details

Journal of Organizational Change Management, vol. 37 no. 3
Type: Research Article
ISSN: 0953-4814

Keywords

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Article
Publication date: 4 February 2025

Abdul Ghaffar, Fazila Islam, Syed Shahid Zaheer Zaidi and Tahir Islam

The purpose of this study is that researchers have widely explored and associated corporate social responsibility (CSR) with firm success. Measuring the relationship between CSR…

10

Abstract

Purpose

The purpose of this study is that researchers have widely explored and associated corporate social responsibility (CSR) with firm success. Measuring the relationship between CSR, service quality, corporate reputation and brand preference by drawing on the stakeholder theory in developing countries remains a substantial research gap.

Design/methodology/approach

The data were collected using a survey method. The study was performed on 387 respondents who have undergone treatments in hospitals. The authors analysed the data using the Smart PLS 3.0 structural equation modelling technique.

Findings

The survey revealed that service quality and CSR are positively linked with corporate reputation, leading to brand preference in the health-care sector.

Research limitations/implications

The survey was performed in the context of the health-care industry; however, additional studies are necessary to extrapolate the findings to other fields, such as education and food. This research helps guide policymakers, administrators, health-care managers and researchers by highlighting the contribution and role of service quality, CSR and corporate reputation in achieving a hospital’s performance.

Originality/value

This study contributes to the CSR literature by introducing the concept of CSR. To the best of the authors’ knowledge, this study also extends research in the diverse literature by examining the relationship between CSR, service quality, corporate reputation and brand preference by illustrating the stakeholder theory in the context of the health-care sector.

Details

International Journal of Pharmaceutical and Healthcare Marketing, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1750-6123

Keywords

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