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21 – 30 of over 1000
Article
Publication date: 1 August 1999

Abdel‐Hakim A. Khalil, Tarek M. Fawzy, Salah El‐Din F. Taher and Galal A. Abdellah

In this paper, Isoparametric finite element formulations are derived for special elements for representing the steel‐concrete interface. Curved multi‐noded Isoparametric element…

Abstract

In this paper, Isoparametric finite element formulations are derived for special elements for representing the steel‐concrete interface. Curved multi‐noded Isoparametric element for reinforcing steel idealization is proposed. In addition, special thin Isoparametric element in a form of a sheath is suggested in order to model the bond‐slip characteristics. Special provisions are taken into account to avoid numerical difficulties. The proposed elements are incorporated in non‐linear finite element program DMGPLSTS and applied to the problem of tension stiffening of reinforced concrete members. The results are noted to reflect a softer overall response attributable to the slip effect.

Details

Engineering Computations, vol. 16 no. 5
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 1 February 1956

G.E.A. Thomann

A method is presented for calculating influence coefficients in multispar wings of any plan form. Shear deflexion, chordwise bending and taper are taken into account. All the…

Abstract

A method is presented for calculating influence coefficients in multispar wings of any plan form. Shear deflexion, chordwise bending and taper are taken into account. All the bending material is concentrated at the rib and spar booms and the skin is assumed to carry only shear. The method is particularly useful in the early stages of design as it is rapid and gives a good internal load distribution. The choice of the method, the assumptions made, and the idealization of the structure are discussed. The structure is reduced to a system of beams and torque boxes, the latter connected to the beams by vertical shear at their corner nodes. The internal forces are first expressed as functions of the displacements at the nodes by means of stiffness coefficients. Next the equations of equilibrium, at each node, are established. Finally the conditions of compatibility are brought in. The solution of this system of equations gives the matrix of influence coefficients. Wherever vertical loads only are applied it is possible to solve for the moment equations of straight beams separately from the remainder of the structure, hence from the stiffness matrix. For convenience, these straight beams are organized into sub‐matrices whose moment equations are ‘reduced’. The specific end conditions also allow further reductions. The internal loads can be obtained by substituting the influence coefficients back into the sub‐matrices and by considering the equilibrium of the beams. The angular displacements of the nodes may also be calculated in a similar manner by using the ‘reduced’ rows from the sub‐matrices.

Details

Aircraft Engineering and Aerospace Technology, vol. 28 no. 2
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 10 June 2021

Hande Yavuz

Python codes are developed for the versatile structural analysis on a 3 spar multi-cell box beam by means of idealization approach.

Abstract

Purpose

Python codes are developed for the versatile structural analysis on a 3 spar multi-cell box beam by means of idealization approach.

Design/methodology/approach

Shear flow distribution, stiffener loads, location of shear center and location of geometric center are computed via numpy module. Data visualization is performed by using Matplotlib module.

Findings

Python scripts are developed for the structural analysis of multi-cell box beams in lieu of long hand solutions. In-house developed python codes are made available to be used with finite element analysis for verification purposes.

Originality/value

The use of python scripts for the structural analysis provides prompt visualization, especially once dimensional variations are concerned in the frame of aircraft structural design. The developed python scripts would serve as a practical tool that is widely applicable to various multi-cell wing boxes for stiffness purposes. This would be further extended to the structural integrity problems to cover the effect of gaps and/or cut-outs in shear flow distribution in box-beams.

Details

Aircraft Engineering and Aerospace Technology, vol. 93 no. 5
Type: Research Article
ISSN: 1748-8842

Keywords

Book part
Publication date: 30 May 2013

Asmund Rygh

International business (IB) research is traditionally heavily reliant on economics. In this chapter, we review selected debates in the philosophy of science of economics and…

Abstract

International business (IB) research is traditionally heavily reliant on economics. In this chapter, we review selected debates in the philosophy of science of economics and consider their relevance for economics-based IB research, given important characteristics of IB such as phenomenon-orientedness, concern with data and facts and limited use of formal mathematical models and unrealistic assumptions in the analysis. We argue that, like in the case of mainstream economics, Lakatos’ concept of scientific research programmes (SRPs) is more useful for understanding the philosophy of science of economics-based IB than Popper’s falsificationism. Following this, we discuss characteristics of two possible IB SRPs, internalization theory and Dunning’s Ownership-Location-Internalization paradigm. Finally, we discuss the approach to modelling in IB, finding it to reflect a relative commitment to scientific realism.

Details

Philosophy of Science and Meta-Knowledge in International Business and Management
Type: Book
ISBN: 978-1-78190-713-9

Article
Publication date: 1 March 1996

Seok‐Soon Lee, Jeong Seo Koo and Jin Min Choi

Two‐noded curved beam elements, CMLC and IMLC, are developed on the basis of Timoshenko’s beam theory and curvilinear co‐ordinates. These elements are developed by the separation…

364

Abstract

Two‐noded curved beam elements, CMLC and IMLC, are developed on the basis of Timoshenko’s beam theory and curvilinear co‐ordinates. These elements are developed by the separation of the radial displacement into the bending and the shear deflection and the projection of the shear deflection into bending deflection. In the CMLC element, field‐consistent membrane strain interpolation is adapted for removing the membrane locking. The CMLC element shows the rapid and stable convergence on the wide range of radius, thickness and length of the curved beam. The field‐consistent membrane strain and the separation of radial displacement produce the most efficient linear element possible.

Details

Engineering Computations, vol. 13 no. 2/3/4
Type: Research Article
ISSN: 0264-4401

Keywords

Article
Publication date: 16 April 2020

Andrea Tomo and Rosanna Spanò

This paper aims to explore how accountants manage the processes of identity (re)construction after identity crisis, resulting from increasing pressures and regulatory…

524

Abstract

Purpose

This paper aims to explore how accountants manage the processes of identity (re)construction after identity crisis, resulting from increasing pressures and regulatory requirements, considering both introspective and the extrospective issues.

Design/methodology/approach

The study drew on an integrated framework drawing on Luigi Pirandello’s views about identity crises and the search for individual coherence and possible representation strategies. It used an ethnographic approach based on photo-elicitation, conversations and documentary sources to explore the identity reconstruction processes of Italian Commercialisti.

Findings

Several conditions caused an identity crisis among Commercialisti, including regulatory requirements, public administration demands and increasing power of IT providers. Commercialisti reacted to these circumstances by re-constructing their image through strategies designed to impress both themselves and others.

Practical implications

The paper has implications for the accounting profession in general and in Italy, suggesting that further pressure may result in rapid change efforts among accountants. It provides a broader and more systematic understanding of the threats to the role of accountants and suggests how they can manage complexity to create new opportunities. It also encourages accountants to focus on alternative roles as a possible new strategy that few have tried.

Originality/value

The paper provides a novel contribution to the understanding of identity crisis issues and related representation strategies in the accounting profession. Unlike past contributions, it made a full assessment of both the dynamics of an identity crisis and the micro-level responses to it, in a new, non-Anglo-Saxon context.

Details

Meditari Accountancy Research, vol. 28 no. 6
Type: Research Article
ISSN: 2049-372X

Keywords

Article
Publication date: 1 October 2020

Osama Bedair

This paper reviews engineering work developed for blast analysis and design of industrial/residential and ammunition storage facilities. The review also covers work done for…

Abstract

Purpose

This paper reviews engineering work developed for blast analysis and design of industrial/residential and ammunition storage facilities. The review also covers work done for progressive collapse analysis and blast deflectors.

Design/methodology/approach

The first part of the paper describes characteristics of various types of explosions. Empirical and numerical models that were developed to estimate structural capacity are reviewed. The structural idealization, theoretical basis, and merits of various methods are also described. The influence of various parameters affecting the structural performance is discussed.

Findings

The material of the paper captures recent engineering developments that can be used by practitioners for blast analysis and design for industrial and residential buildings. Little emphasis was given in the published literature to develop simplified analytical models that can be used in practice to compute the dynamic response of buildings subject to accidental explosions. Furthermore, analytical expressions are required to compute the reduction in the stiffness due to impact loading.

Originality/value

Current building codes address conventional live, dead, wind and earthquake loads. Very few guidelines are available in practice for design of buildings subject to blast loading. The objective of this paper is to review and piece together recent engineering work developed for blast analysis and design of industrial/residential buildings and ammunition facilities. The paper provides useful resource material for the engineers in practice using recent techniques to design these structures. The review covers past three decades that can be used as a baseline for future developments.

Details

Multidiscipline Modeling in Materials and Structures, vol. 17 no. 2
Type: Research Article
ISSN: 1573-6105

Keywords

Article
Publication date: 7 April 2015

Liang Cheng, Qing Wang, Jiangxiong Li and Yinglin Ke

The aim of this paper is to present a new variation modeling method for fuselage structures in digital large aircraft assembly. The variation accumulated in a large aircraft…

Abstract

Purpose

The aim of this paper is to present a new variation modeling method for fuselage structures in digital large aircraft assembly. The variation accumulated in a large aircraft assembly process will influence the dimensional accuracy and fatigue life of airframes. However, in digital large aircraft assembly, variation analysis and modeling are still unresolved issues.

Design/methodology/approach

An elastic structure model based on beam elements is developed, which is an equivalent idealization of the actual complex structure. The stiffness matrix of the structure model is obtained by summing the stiffness matrices of the beam elements. For each typical stage of the aircraft digital assembly process, including positioning, coordinating, joining and releasing, variation models are built using the simplified structure model with respective loads and boundary conditions.

Findings

Using position errors and manufacturing errors as inputs, the variations for every stage of the assembly process can be calculated using the proposed model.

Practical implications

This method has been used in a large fuselage section assembly project, and the calculated results were shown to be a good prediction of variation in the actual assembly.

Originality/value

Although certain assumptions have been imposed, the proposed method provides a better understanding of the assembly process and creates an analytical foundation for further work on variation control and tolerance optimization.

Details

Assembly Automation, vol. 35 no. 2
Type: Research Article
ISSN: 0144-5154

Keywords

Article
Publication date: 1 June 1961

J.H. Argyris and S. Kelsey

As a first example of the application of the cut‐out procedure to fuselage problems and the selection of appropriate cut systems, the elimination of a complete ring is discussed…

Abstract

As a first example of the application of the cut‐out procedure to fuselage problems and the selection of appropriate cut systems, the elimination of a complete ring is discussed in detail. ‘Minimal’, ‘maximal’ and ‘dismembering’ techniques are all applied to singly and doubly connected rings, and attention is drawn to some inadmissible and critical combinations of cuts in order to guide the most effective choice. The second fuselage example treats similarly the removal of a portion only of the ring.

Details

Aircraft Engineering and Aerospace Technology, vol. 33 no. 6
Type: Research Article
ISSN: 0002-2667

Article
Publication date: 1 September 1996

Ronald K. Mitchell

Notes that because oral histories illuminate insider meanings, they can contribute valuable insights to the demystification of expert experiences. The world of expert…

1567

Abstract

Notes that because oral histories illuminate insider meanings, they can contribute valuable insights to the demystification of expert experiences. The world of expert entrepreneurs is often misunderstood because of its sensationalization and/or idealization. Sets out to narrow the gap between mythical and actual entrepreneur through the use of the qualitative analysis of entrepreneur oral histories. Analyses in‐depth interviews with 23 practising western US entrepreneurs about their venturing histories to identify the common “stories” and shared interpretations that form parts of the entrepreneurial “expert scripts” that explain responses to successes and failures. Salient portions of the histories cited contribute to sound attributions regarding entrepreneurial success and failure and to a more enlightened approach to venture creation.

Details

Journal of Management History, vol. 2 no. 3
Type: Research Article
ISSN: 1355-252X

Keywords

21 – 30 of over 1000