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Article
Publication date: 31 May 2018

Mohammadbashir Sedighi, Stephan Lukosch, Frances Brazier, Mohsen Hamedi and Cees van Beers

This paper aims to explore the relationships between participants’ perceived benefits of sharing knowledge privately, within a group or with the general public within an…

2014

Abstract

Purpose

This paper aims to explore the relationships between participants’ perceived benefits of sharing knowledge privately, within a group or with the general public within an organisational knowledge network. The quality and quantity of knowledge shared are explored in relation to the level of knowledge sharing visibility (both content and participants’ profiles).

Design/methodology/approach

A research framework of perceived benefits of knowledge sharing is designed; survey and content analysis are used to explore influences of perceived benefits on the quantity and quality of knowledge shared by participants for each level of knowledge sharing within an organisation. The research model is empirically tested using a questionnaire survey with 205 participants and content analysis of their contributions in a high-tech corporate group. This study uses the partial least squares path-modelling method to explore relationships between constructs of the research model.

Findings

The current research results show that intrinsic benefits are more influential than extrinsic benefits for private knowledge sharing, while extrinsic rewards play an important role at the public knowledge sharing within organisations. In addition, results indicate that both the quality and quantity of knowledge sharing at the group-level knowledge sharing are significantly higher than at the private and the public levels.

Practical implications

Contemporary knowledge management systems are developed by integrating communication channels in different visibility levels of knowledge exchange. Managers of knowledge management systems are advised to use the research outcome for developing incentive strategies in different levels.

Originality/value

In contrast to previous studies that focus on only one level of knowledge sharing, this paper explores relationships between perceived benefits of knowledge sharing with the quantity and quality of shared knowledge for three distinct levels of knowledge sharing.

Details

Journal of Knowledge Management, vol. 22 no. 6
Type: Research Article
ISSN: 1367-3270

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Article
Publication date: 30 August 2021

Iman Sedighi, Majid R. Ayatollahi, Bahador Bahrami, Marco A. Pérez-Martínez and Andrés A. Garcia-Granada

The purpose of this paper is to study the Mode I fracture behavior of polycarbonate (PC) parts produced using fused deposition modeling (FDM). The focus of this study is on…

160

Abstract

Purpose

The purpose of this paper is to study the Mode I fracture behavior of polycarbonate (PC) parts produced using fused deposition modeling (FDM). The focus of this study is on samples printed along the out-of-plane direction with different raster angles.

Design/methodology/approach

Tensile and Mode I fracture tests were conducted. Semi-circular bend specimens were used for the fracture tests, which were printed in four different raster patterns of (0/90), (15/−75) (30/−60) and (45/−45). Moreover, the finite element method (FEM) was used to determine the applicability of linear elastic fracture mechanics (LEFM) for the printed PC parts. The fracture toughness results, as well as the fracture path and the fracture surfaces, were studied to describe the fracture behavior of the samples.

Findings

Finite element results confirm that the use of LEFM is allowed for the tested PC samples. The fracture toughness results show that changing the direction of the printed rasters can have an effect of up to 50% on the fracture toughness of the printed parts, with the (+45/−45) and (0/90) orientations having the highest and lowest resistance to crack propagation, respectively. Moreover, except for the (0/90) orientation, the other samples have higher crack resistance compared to the bulk material. The fracture toughness of the tested PC depends more on the toughness of the printed sample, rather than its tensile strength.

Originality/value

The toughness and the energy absorption capability of the printed samples (with different raster patterns) were identified as the main properties affecting the fracture toughness of the AM PC parts. Because the fracture resistance of almost all the samples was higher than that of the base material, it is evident that by choosing the right raster patterns for 3D-printed parts, very high resistance to crack growth may be obtained. Also, using FEM and comparing the size of the plastic zones, it was concluded that, although the tensile curves show nonlinearity, LEFM is still applicable for the printed parts.

Details

Rapid Prototyping Journal, vol. 28 no. 2
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 10 July 2021

Kaiyu He, Muhammad Nadeem, Siddra Habib, H.M. Sedighi and Duohui Huang

The main purpose of this paper is to calculate the analytical solution or a closed-form solution for the temperature distribution in the heterogeneous casting-mould system.

57

Abstract

Purpose

The main purpose of this paper is to calculate the analytical solution or a closed-form solution for the temperature distribution in the heterogeneous casting-mould system.

Design/methodology/approach

First, the authors formulate and analyze the mathematical formulation of heat conduction equation in the heterogeneous casting-mould system, with an arbitrary assumption of the ideal contact at the cast-mould contact point. Then, He-Laplace method, based on variational iteration method (VIM), Laplace transform and homotopy perturbation method (HPM), is used to elaborate the analytical solution of this system. The main focus of He-Laplace method is to find the Lagrange multiplier with an easy approach which enables the implementation of HPM very smoothly and provides the series solution very close to the exact solution.

Findings

An example is considered to show that He-Laplace method provides the efficient results for calculating the temperature distribution in the casting-mould heterogeneous system. Graphical representation and error distribution represents that He-Laplace method is very simple to implement and effective for casting-mould heterogeneous system.

Originality/value

The work in this paper is original and advanced. Specially, calculation of Lagrange multiplier for casting-mould system has not been reported in the literature for this work.

Details

International Journal of Numerical Methods for Heat & Fluid Flow, vol. 32 no. 3
Type: Research Article
ISSN: 0961-5539

Keywords

Available. Open Access. Open Access
Article
Publication date: 30 August 2023

Mehrgan Malekpour, Mohammadbashir Sedighi, Federica Caboni, Vincenzo Basile and Ciro Troise

This research aims to fill the research gaps regarding customer preferences for digitalisation to create value for retailers and customers, as well as focus on retail change and…

3437

Abstract

Purpose

This research aims to fill the research gaps regarding customer preferences for digitalisation to create value for retailers and customers, as well as focus on retail change and shopping behaviour in grocery retail stores in the emerging market.

Design/methodology/approach

This paper contributes to the research in this area by evaluating customers' and retailers' attitudes towards digital transformation in retailing through interviews. Methodologically, 200 questionnaires were gathered, and data were analysed with the partial least squared structural equation modelling method.

Findings

The findings of this study reveal that the effect of digital transformation in the retail industry will be more apparent in an emerging market.

Originality/value

The paper's originality consists in understanding the future retail structure in an emerging market. Notably, focussing on business-to-consumer businesses appears helpful in distinguishing between behavioural (buying) intention and online buying behaviour (actual usage) in an emerging market.

Details

International Journal of Emerging Markets, vol. 20 no. 13
Type: Research Article
ISSN: 1746-8809

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Article
Publication date: 27 August 2024

Soroush Dehghan Salmasi, Mohammadbashir Sedighi, Hossein Sharif and Mahmood Hussain Shah

Traditionally, the banking and financial sectors have pioneered adoption of new technologies and business models. One important digital banking model that has proven its efficacy…

155

Abstract

Purpose

Traditionally, the banking and financial sectors have pioneered adoption of new technologies and business models. One important digital banking model that has proven its efficacy in recent times, is Digital-Only Banking (DOB) where consumers interact with their banks through digital channels only. Having detailed knowledge of what actually happens at the consumer level during the adoption of new digital models and technologies is paramount to the success of these technological initiatives. The present study aims to investigate DOB adoption behavior and possible barriers using a quantitative approach at the consumer level. A conceptual model is developed by extending the Unified Theory of Acceptance and Use of Technology (UTAUT) model, incorporating Trust (TR), Perceived Risk (PR) constructs and cultural moderators of Individualism (IDV) and Uncertainty Avoidance (UA).

Design/methodology/approach

For this study, an online survey instrument was created and administered in Iran. The research sample was selected through the application of purposive sampling. Data from 788 respondents were analyzed. The proposed model was tested using Partial Least Square.?.s Structural Equation Modeling (PLS-SEM).

Findings

The results show that DOB adoption is positively influenced by Effort Expectancy (EE), Social Influence (SI), and Facilitating Conditions (FC), while PR negatively influences DOB adoption intention. Unexpectedly, the results indicate that TR has no significant impact on DOB usage intention. Additionally, this study demonstrates that with individuals having a low level of IDV, the relationship between PE and BI is stronger, and with individuals having a low level of UA, the impact of SI on BI is stronger. It also reveals that the impact of TR on BI is stronger in low individualistic cultures.

Practical implications

DOB providers should enhance support features of their services or provide facilities that make it simpler for users to accomplish online transactions. Here, in order to improve the UI/UX design of their apps, DOB product managers should carefully observe the technical guidelines of the operating systems of digital devices, such as the Human Interface Guidelines (HIG) for iOS and Material You for Android. Additionally, DOB providers should build partnerships with mega online retailers to provide hassle-free and easy to use payment solutions for consumers.

Originality/value

DOB, as a novel and business model, has been investigated in very few studies, especially regarding any which focus on its adoption. To fill this gap, this research investigates DOB adoption through a modified version of the UTAUT model. The findings of this study suggest that future research regarding DOB should consider sources of TR, types of non-adopters, and context. This study, as the first of its kind in DOB literature, also highlights the significant role played by cultural values in customer behavior regarding DOB adoption.

Details

International Journal of Bank Marketing, vol. 42 no. 7
Type: Research Article
ISSN: 0265-2323

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Article
Publication date: 15 August 2024

Mohammadbashir Sedighi and Negin Hashemi

With the advent of digital platforms, entrepreneurs have been able to communicate and share information in visible environments. By focusing on the visibility aspect of digital…

68

Abstract

Purpose

With the advent of digital platforms, entrepreneurs have been able to communicate and share information in visible environments. By focusing on the visibility aspect of digital platform in a resource-constrained economy, this study aims to propose a conceptual model for exploring entrepreneurial opportunity identification. Furthermore, this study delves into the moderating influence of entrepreneurial alertness on opportunity recognition.

Design/methodology/approach

A research model is constructed using the theory of communication visibility to investigate how message transparency and network translucence affect the identification and development of entrepreneurial opportunities, with additional exploration of the moderating influence of entrepreneurial alertness. A questionnaire survey is conducted with 152 Iranian founder-entrepreneurs to test the proposed conceptual model. The research model’s constructs are analyzed using the partial least squares structural equation modeling method.

Findings

The results confirm that communication visibility impacts both aspects of entrepreneurial opportunity identification. In addition, this study reveals the distinctive moderating effects of entrepreneurial alertness on the relationship between message transparency and the creation and discovery of entrepreneurial opportunities, while finding no significant effect on network transparency and opportunity identification.

Originality/value

This paper stands out for its originality in collecting data from an emerging market. Besides, it explores the association between entrepreneurs’ communication dimensions and the recognition of new opportunities at the intersection of digital platforms and entrepreneurship literature. Furthermore, it empirically illustrates the moderating role of entrepreneurial alertness in the relationships between communication visibility and opportunity identification, contributing significantly to existing research.

Details

Journal of Entrepreneurship in Emerging Economies, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 2053-4604

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Article
Publication date: 4 July 2016

Davood Afshari, M. Sedighi, M.R. Karimi and Z. Barsoum

The purpose of this paper is to predict residual stresses in resistance spot weld of 2 mm thick aluminum 6061-T6 sheets. The joint use of finite element analysis and artificial…

380

Abstract

Purpose

The purpose of this paper is to predict residual stresses in resistance spot weld of 2 mm thick aluminum 6061-T6 sheets. The joint use of finite element analysis and artificial neural networks can eliminate the high costs of residual stresses measuring tests and significantly shorten the time it takes to arrive at a solution.

Design/methodology/approach

Finite element method and artificial neural network have been used to predict the residual stresses. Different spot welding parameters such as the welding current, the welding time and the electrode force have been used for the simulation purposes in a thermal-electrical-structural coupled finite element model. To validate the numerical results, a series of experiments have been performed, and residual stresses have been measured. The results obtained from the finite element analysis have been used to build up a back-propagation artificial neural network model for residual stresses prediction.

Findings

The results revealed that the neural network model created in this study can accurately predict residual stresses produced in resistance spot weld. Using a combination of these two developed models, the residual stresses can be predicted in terms of spot weld parameters with high speed and accuracy.

Practical implications

The paper includes implication for aircraft and automobile industries to predict residual stresses. Residual stresses can lower the strength and fatigue life of the spot-welded joints and determine the performance quality of the structure.

Originality/value

This paper presents an approach to reduce the high costs and long times of residual stresses measuring tests.

Details

Aircraft Engineering and Aerospace Technology: An International Journal, vol. 88 no. 4
Type: Research Article
ISSN: 1748-8842

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Article
Publication date: 29 May 2023

Bahador Bahrami, Mohammad Reza Mehraban, Seyed Saeid Rahimian Koloor and Majid R. Ayatollahi

The purpose of this study is to develop an efficient numerical procedure for simulating the effect of printing orientation, as one of the primary sources of anisotropy in…

188

Abstract

Purpose

The purpose of this study is to develop an efficient numerical procedure for simulating the effect of printing orientation, as one of the primary sources of anisotropy in 3D-printed components, on their fracture properties.

Design/methodology/approach

The extended finite element method and the cohesive zone model (XFEM-CZM) are used to develop subroutines for fracture simulation. The ability of two prevalent models, i.e. the continuous-varying fracture properties (CVF) model and the weak plane model (WPM), and a combination of both models (WPM-CVF) are evaluated to capture fracture behavior of the additively manufactured samples. These models are based on the non-local and local forms of the anisotropic maximum tangential stress criterion. The numerical models are assessed by comparing their results with experimental outcomes of 16 different configurations of polycarbonate samples printed using the material extrusion technique.

Findings

The results demonstrate that the CVF exaggerates the level of anisotropy, and the WPM cannot detect the mild anisotropy of 3D-printed parts, while the WPM-CVF produces the best results. Additionally, the non-local scheme outperforms the local approach in terms of finite element analysis performance, such as mesh dependency, robustness, etc.

Originality/value

This paper provides a method for modeling anisotropic fracture in 3D-printed objects. A new damage model based on a combination of two prevalent models is offered. Moreover, the developed subroutines for implementing the non-local anisotropic fracture criterion enable a reliable crack propagation simulation in media with varying degrees of complication, such as anisotropy.

Details

Rapid Prototyping Journal, vol. 29 no. 8
Type: Research Article
ISSN: 1355-2546

Keywords

Available. Open Access. Open Access
Article
Publication date: 7 January 2021

Giovanni Gómez-Gras, Marco A. Pérez, Jorge Fábregas-Moreno and Guillermo Reyes-Pozo

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…

5714

Abstract

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.

Details

Rapid Prototyping Journal, vol. 27 no. 11
Type: Research Article
ISSN: 1355-2546

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Article
Publication date: 25 June 2021

Cem Boğa

Acrylonitrile butadiene styrene (ABS), as a light and high strength thermoplastic polymer, has found extensive applications in different industries. Fused filament fabrication…

327

Abstract

Purpose

Acrylonitrile butadiene styrene (ABS), as a light and high strength thermoplastic polymer, has found extensive applications in different industries. Fused filament fabrication, known as three-dimensional (3D) printing technique is considered a rapid prototyping technique that is frequently applied for production of samples of ABS material. Therefore, the purpose of this study is to investigate the mechanical and fracture behavior of such materials and the techniques to improve such properties.

Design/methodology/approach

Experimental and numerical analyses have been conducted to investigate the effects of internal architecture and chopped carbon fiber (CF) fillers on the mechanical properties and mixed mode fracture behavior of the ABS samples made by 3D printing technique. Four different filling types at 70% filling ratios have been used to produce tensile and special fracture test samples with pure and CF filled ABS filaments (CF-ABS) using 3D process. A special fixture has been developed to apply mixed mode loading on fracture samples, and finite element analyses have been conducted to determine the geometric function of such samples at different loading angles.

Findings

It has been determined that the printing pattern has a significant effect on the mechanical properties of the sample. The addition of 15% CF to pure ABS resulted in a significant increase in tensile strength of 46.02% for line filling type and 15.04% for hexagon filling type. It has been determined that as the loading angle increases from 0° to 90°, the KIC value decreases. The addition of 15% CF increased the KIC values for hexagonal and line filling type by 64.14% and 12.5%, respectively.

Originality/value

The damage that will occur in ABS samples produced in 3D printers depends on the type, amount, filling speed, filling type, filling ratio, filling direction and mechanical properties of the additives. All these features are clearly dependent on the production method. Even if the same additive is used, the production method difference shows different microstructural parameters, especially different mechanical properties.

Details

Rapid Prototyping Journal, vol. 27 no. 6
Type: Research Article
ISSN: 1355-2546

Keywords

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