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Article
Publication date: 15 October 2019

Zhuo Zhuang, Song Cen and Qing Zhang

229

Abstract

Details

Engineering Computations, vol. 36 no. 8
Type: Research Article
ISSN: 0264-4401

Article
Publication date: 5 August 2019

Tao Wang, Zhanli Liu, Yue Gao, Xuan Ye and Zhuo Zhuang

The interaction between hydraulic fracture (HF) and natural fracture (NF) in naturally fractured rocks is critical for hydraulic fracturing. This paper aims to focus on…

140

Abstract

Purpose

The interaction between hydraulic fracture (HF) and natural fracture (NF) in naturally fractured rocks is critical for hydraulic fracturing. This paper aims to focus on investigating the development of tensile and shear debonding zone on the NF caused by the stresses produced by HF, and the influence of NF’s debonding behavior on the interaction between HF and NF.

Design/methodology/approach

Theoretically, tensile and shear debonding modes of NF are considered, two dimensionless parameters are proposed to characterize the difficulty of tensile and shear failure of NF, respectively. Numerically, a finite element model combining the extended finite element method and cohesive zone method (CZM) is proposed to study NF’s debonding behavior and its influence on the interaction between HF and NF.

Findings

Both theoretical analysis and numerical simulation show the existence of two debonding modes. The numerical results also show that the HF can cross, offset or propagate along the NFs depending on the parameters’ value, resulting in different fracture network and stimulated reservoir volume. When they are large, the NF’s debonding area is small, HF tends to cross the NF and the fracture network is simple; when they are small, the NF’s debonding area is large, HF will propagate along the NF. In addition, HF is easier to propagate along with NF under tensile debonding mode while it is easier to pass through NF under shear debonding mode.

Originality/value

The theoretical and numerical considerations are taken into account in the influence of the debonding of NFs on the interaction between HFs and NFs and the influence on the formation of the fracture network.

Details

Engineering Computations, vol. 36 no. 8
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 8 May 2018

Yongliang Wang, Yang Ju, Zhuo Zhuang and Chenfeng Li

This study aims to develop an adaptive finite element method for structural eigenproblems of cracked Euler–Bernoulli beams via the superconvergent patch recovery…

Abstract

Purpose

This study aims to develop an adaptive finite element method for structural eigenproblems of cracked Euler–Bernoulli beams via the superconvergent patch recovery displacement technique. This research comprises the numerical algorithm and experimental results for free vibration problems (forward eigenproblems) and damage detection problems (inverse eigenproblems).

Design/methodology/approach

The weakened properties analogy is used to describe cracks in this model. The adaptive strategy proposed in this paper provides accurate, efficient and reliable eigensolutions of frequency and mode (i.e. eigenpairs as eigenvalue and eigenfunction) for Euler–Bernoulli beams with multiple cracks. Based on the frequency measurement method for damage detection, using the difference between the actual and computed frequencies of cracked beams, the inverse eigenproblems are solved iteratively for identifying the residuals of locations and sizes of the cracks by the Newton–Raphson iteration technique. In the crack detection, the estimated residuals are added to obtain reliable results, which is an iteration process that will be expedited by more accurate frequency solutions based on the proposed method for free vibration problems.

Findings

Numerical results are presented for free vibration problems and damage detection problems of representative non-uniform and geometrically stepped Euler–Bernoulli beams with multiple cracks to demonstrate the effectiveness, efficiency, accuracy and reliability of the proposed method.

Originality/value

The proposed combination of methodologies described in the paper leads to a very powerful approach for free vibration and damage detection of beams with cracks, introducing the mesh refinement, that can be extended to deal with the damage detection of frame structures.

Article
Publication date: 30 June 2020

Kaili Yao, Dongyang Chu, Ting Li, Zhanli Liu, Bao-Hua Guo, Jun Xu and Zhuo Zhuang

The purpose of this paper is to calculate the Hugoniot relations of polyurea; also to investigate the atomic-scale energy change, the related chain conformation evolution…

Abstract

Purpose

The purpose of this paper is to calculate the Hugoniot relations of polyurea; also to investigate the atomic-scale energy change, the related chain conformation evolution and the hydrogen bond dissociation of polyurea under high-speed shock.

Design/methodology/approach

The atomic-scale simulations are achieved by molecular dynamics (MD). Both non-equilibrium MD and multi-scale shock technique are used to simulate the high-speed shock. The energy dissipation is theoretically derived by the thermodynamic and the Hugoniot relations. The distributions of bond length, angle and dihedral angle are used to characterize the chain conformation evolution. The hydrogen bonds are determined by a geometrical criterion.

Findings

The Hugoniot relations calculated are in good agreement with the experimental data. It is found that under the same impact pressure, polyurea with lower hard segment content has higher energy dissipation during the shock-release process. The primary energy dissipation way is the heat dissipation caused by the increase of kinetic energy. Unlike tensile simulation, the molecular potential increment is mainly divided into the increments of the bond energy, angle energy and dihedral angle energy under shock loading and is mostly stored in the soft segments. The hydrogen bond potential increment only accounts for about 1% of the internal energy increment under high-speed shock.

Originality/value

The simulation results are meaningful for understanding and evaluating the energy dissipation mechanism of polyurea under shock loading, and could provide a reference for material design.

Details

Engineering Computations, vol. 38 no. 3
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 19 June 2019

Qinglei Zeng, Zhanli Liu, Tao Wang, Yue Gao and Zhuo Zhuang

The purpose of this paper is to develop a numerical method to model the simultaneous propagation of multiple hydraulic fractures (HFs) with fluid lags driven from a…

Abstract

Purpose

The purpose of this paper is to develop a numerical method to model the simultaneous propagation of multiple hydraulic fractures (HFs) with fluid lags driven from a horizontal wellbore.

Design/methodology/approach

Fracture propagation in solid medium is modeled with the extended finite element method and fluid flow is modeled with finite volume method. Three iteration loops are introduced to solve the nonlinear system within each time increment, i.e. a Newtonian iteration to solve the solid-fluid coupling system, a Picard iteration to determine fluid front positions and a secant iteration to update fracture lengths.

Findings

The propagation of one single HF with a fluid lag is simulated and agrees well with semi-analytical solutions or other numerical results in the literature. The simultaneous propagation of two HFs are then investigated, which demonstrates the ability of the proposed method in capturing the hydraulic fracturing process with multiple fractures and fluid lags.

Originality/value

With the proposed method, one can simulate the simultaneous propagation of multiple HFs with fluid lags, which play a significant role during early-time propagation or when the confinement stress is relatively low (shallow HFs). Solid deformation and fracturing, fluid flow in fractures and in the wellbore are fully coupled, and three iteration loops are introduced to solve the nonlinear system.

Details

Engineering Computations, vol. 36 no. 8
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 21 July 2020

Chengcheng Luo, Shaowu Ning, Zhanli Liu, Xiang Li and Zhuo Zhuang

This paper aims to propose a design method for attenuating stress waves pressure using soft matrix embedded with particles.

Abstract

Purpose

This paper aims to propose a design method for attenuating stress waves pressure using soft matrix embedded with particles.

Design/methodology/approach

Based on the phononic crystal theory, the particle composed of hard core and soft coating can form a spring oscillator structure. When the frequency of the wave is close to the resonance frequency of the spring oscillator, it can cause the resonance of the particle and absorb a lot of energy. In this paper, the resonant phononic crystal with three phases, namely, matrix, particle core and coating, is computationally designed to effectively mitigate the stress wave with aperiodic waveform.

Findings

The relationship between the center frequency and width of the bandgap and the geometric and physical parameters of particle core are discussed in detail, and the trend of influence is analyzed and explained by a spring oscillator model. Increasing the radius of hard core could effectively enhance the bandgap width, thus enhancing the effect of stress wave attenuation. In addition, it is found that when the wave is in the bandgap, adding viscosity into the matrix will not further enhance the stress attenuation effect, but will make the stress attenuation effect of the material worse because of the competition between viscous dissipation mechanism and resonance mechanism.

Research limitations/implications

This study will provide a reference for the design of stress wave protection materials with general stress waves.

Originality/value

This study proposes a design method for attenuating stress waves pressure using soft matrix embedded with particles.

Details

Engineering Computations, vol. 38 no. 2
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 20 January 2007

Edward Kasabov

The purpose of this paper is to deconstruct a growing area in marketing theory. It aims to critically examine the principles of relationship marketing as found in the…

3078

Abstract

Purpose

The purpose of this paper is to deconstruct a growing area in marketing theory. It aims to critically examine the principles of relationship marketing as found in the literature and suggest opportunities for future conceptual maturation.

Design/methodology/approach

The conceptual discussion aims to assist future progress of relationship marketing and, more generally, marketing theory. While focusing on specific areas of departures and inadequacies in past and current research in the area, the discussion notes seminal philosophical questions which underpin current marketing sensibilities and which inform the nature of relational discourses.

Findings

It is argued that, in spite of recent developments in and maturation of relational discourses, some research in the field remains rather non‐contingent, theoretical and not observation‐informed. Importantly, it is biased towards the discussion of positive aspects of relationships. Matters of consequence to practice and research such as power and disciplining remain under‐researched.

Research limitations/implications

By deconstructing and reconstructing current relationship marketing theory – partly by using a study of power and disciplining in situations of consumer dissatisfaction – ways of confronting shortcomings of relational research are illustrated. A more balanced and nuanced approach to marketing research and practice is proposed.

Originality/value

This is one of the few papers in marketing research, and relationship‐marketing research in particular, conceptually intrigued by the peculiarities of current thinking of relationships and exchanges. The contribution centres on three observations and a number of suggestions for future relational analysis. The discussion aims to help promote a fuller, deeper understanding of exchanges. It has been designed as a sketchy guide to future relationship marketing research.

Details

European Journal of Marketing, vol. 41 no. 1/2
Type: Research Article
ISSN: 0309-0566

Keywords

Article
Publication date: 9 November 2010

Mohammed Arif and Charles Egbu

The purpose of this paper is to establish manufactured construction as a good potential alternative to meet the growing housing needs of China.

5370

Abstract

Purpose

The purpose of this paper is to establish manufactured construction as a good potential alternative to meet the growing housing needs of China.

Design/methodology/approach

The paper uses literature review and case study as research methodologies. Literature review is used to identify the need for housing and establish the manufacturing prowess of China. The case study is used to look at how a similar problem has been tackled in the UK and then the case study findings are used to identify future direction for China.

Findings

Findings suggest that there is an acute shortage of housing in China, and at the same time the manufacturing sector in China is very strong. Therefore, in order to meet the housing demand for the population, manufactured construction offers a very attractive and cost‐efficient alternative.

Practical implications

Manufactured construction is an attractive alternative for China and therefore the government needs to encourage this sector through subsidies and tax benefits. Given that currently China is regarded as a manufacturing powerhouse, it will be relatively easy to establish manufactured construction as an organised and supported sector by the government.

Originality/value

The paper presents manufactured construction as an attractive alternative and strategic direction that China should adopt to meet the growing housing needs of the citizens. This also would appear to be an obvious alternative, given the manufacturing capabilities of China.

Details

Engineering, Construction and Architectural Management, vol. 17 no. 6
Type: Research Article
ISSN: 0969-9988

Keywords

Abstract

Details

Journal of Hospitality and Tourism Technology, vol. 13 no. 3
Type: Research Article
ISSN: 1757-9880

Article
Publication date: 31 March 2022

Gianluca Elia, Valeria Stefanelli and Greta Benedetta Ferilli

In recent years, the penetration of digital technologies in the financial industry determined the arising of Fintech, which generated a dynamic and rapid change that…

1342

Abstract

Purpose

In recent years, the penetration of digital technologies in the financial industry determined the arising of Fintech, which generated a dynamic and rapid change that business operators and supervisory authorities in the banking industry are struggling to follow it. This is especially due to issues affecting financial intermediaries and customers, and potential risks of stability of the financial system. The aim of this paper is to provide a review of Fintech in the banking industry thus to update the knowledge about technology innovation in the banking sector, identify the major trends in the domain and delineate future research directions.

Design/methodology/approach

The study reviews 377 articles indexed on Scopus from 2014 to 2021 that focus on Fintech and the banking industry. The methodology adopted is structured in two steps: the keywords selection and the analysis of the documents extracted. The first step identified “Fintech” and “bank” as keywords to be searched within the title, abstract or keywords of documents indexed on Scopus; whereas the second step combined R and VOSviewer to provide a descriptive analysis of the dataset and the analysis of keywords and occurrences, respectively.

Findings

Results achieved in the study allow providing a systemic view of the Fintech in the banking industry, including the emergent phenomenon of digital banking. In particular, it is provided with a general overview and descriptive information on the entire sample of documents analyzed, their authors, the keywords used and the most cited works. Besides, a deepening on the model of digital banking is provided, by delineating the six dimensions of the key effects generated by the digital bank model.

Originality/value

Two main elements of originality characterize this study. The first one is related to the fact that few review studies have been published on Fintech in the banking industry, and the second one concerns the multiple dimensions of the impact of Fintech in the banking sector, which includes customer, company, bank, regulation authority and society.

Details

European Journal of Innovation Management, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1460-1060

Keywords

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