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Article
Publication date: 15 November 2013

Jeremy Doucet, Xiang Zhang and Philip Irving

This paper aims to present the implementation of a finite element (FE) model used to establish crack and delamination development in a Glare reinforced aluminium plate…

Abstract

Purpose

This paper aims to present the implementation of a finite element (FE) model used to establish crack and delamination development in a Glare reinforced aluminium plate under fatigue loading. This model predicts the behaviour of bonded GLARE straps used as crack retarders for life extension of aircraft structures. In particular, it takes into account the interaction that exists between the substrate crack and the delamination crack at the interface with the reinforcement.

Design/methodology/approach

In this work, a 3D FE model with three-layer continuum shell elements has been developed to calculate changes in substrate stress intensity and in fatigue crack growth (FCG) rate produced by bonded strap reinforcement. Both circular and elliptical strap delamination geometries were incorporated into the model. Calculated stress intensity factors (SIFs) were used together with measured FCG data for substrate material to predict FCG rates for the strapped condition.

Findings

The model predicted a decrease in the SIF and a retardation of FCG rates. The SIF was predicted to vary through the thickness of the substrate due to the phenomenon of secondary bending and also the bridging effect caused by the presence of the strap. The influence of delamination shape and size on substrate crack stress intensity and delamination strain energy release rate has been calculated.

Originality/value

This research aims at developing modelling techniques that could be used when studying larger reinforced structures found in aircraft.

Details

International Journal of Structural Integrity, vol. 4 no. 4
Type: Research Article
ISSN: 1757-9864

Keywords

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Article
Publication date: 1 March 1977

The Hawker Siddeley HS 125–700 is a low‐wing, twin engined, eight‐to‐fourteen seat business jet.

Abstract

The Hawker Siddeley HS 125–700 is a low‐wing, twin engined, eight‐to‐fourteen seat business jet.

Details

Aircraft Engineering and Aerospace Technology, vol. 49 no. 3
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 24 February 2020

Eric Asa, Monisha Shrestha, Edmund Baffoe-Twum and Bright Awuku

Environmental issues caused by the production of Portland cement have led to it being replaced by waste materials such as fly ash, which is more economical and safer for…

Abstract

Purpose

Environmental issues caused by the production of Portland cement have led to it being replaced by waste materials such as fly ash, which is more economical and safer for the environment. Also, fly ash is a material with sustainable properties. Therefore, this paper aims to focus on the development of sustainable construction materials using 100% high-calcium fly ash and potassium hydroxide (KOH)-based alkaline solution and study the engineering properties of the resulting fly ash-based geopolymer concrete. Laboratory tests were conducted to determine the mechanical properties of the geopolymer concrete such as compressive strength, flexural strength, curing time and slump. In phase I of the study, carbon nanotubes (CNTs) were added to determine their effect on the strength of the geopolymer mortar. The results derived from the experiments indicate that mortar and concrete made with 100% fly ash C require an alkaline solution to produce similar (comparable) strength characteristics as Portland cement concrete. However, it was determined that increasing the amount of KOH generates a considerable amount of heat causing the concrete to cure too quickly; therefore, it is notable to forming a proper bond was unable to form a stronger bond. This study also determined that the addition of CNTs to the mix makes the geopolymer concrete tougher than the traditional concrete without CNT.

Design/methodology/approach

Tests were conducted to determine properties of the geopolymer concrete such as compressive strength, flexural strength, curing time and slump. In Phase I of the study, CNTs were studied to determine their effect on the strength of the geopolymer mortar.

Findings

The results derived from the experiments indicate that mortar and concrete made with 100% fly ash C require an alkaline solution to produce the same strength characteristics as Portland cement concrete. However, it was determined that increasing the amount of KOH generates too much heat causing the concrete to cure too quickly; therefore, it is notable to forming a proper bond. This study also determined that the addition of CNTs to the mix makes the concrete tougher than concrete without CNT.

Originality/value

This study was conducted at the construction engineering and management concrete laboratory at North Dakota State University in Fargo, North Dakota. All the experiments were conducted and analyzed by the authors.

Details

Journal of Engineering, Design and Technology , vol. 18 no. 6
Type: Research Article
ISSN: 1726-0531

Keywords

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Article
Publication date: 1 December 2005

Daniel C.W. Ho, S.M. Lo and C.Y. Yiu

This paper provides a comprehensive review of the literature concerning the various causes of failures of external wall tile finishes.

Abstract

Purpose

This paper provides a comprehensive review of the literature concerning the various causes of failures of external wall tile finishes.

Design/methodology/approach

A 4×3 matrix hierarchy framework is developed for a systematic analysis of the literature reviewed.

Findings

The findings from this paper indicate the importance of environmental effects, movement joints, and adhesive on the performance of external wall tile finishes. Thermal and moisture effects induce movement of tiles, and the failure of the tiling system depends very much on the adhesive strength and the provision of movement joints. Workmanship is also a key factor affecting the performance of external wall tile finishes and should not be overlooked.

Research limitations/implications

Various studies have been carried out on the causes of defects in external finishes in the past. However, many of them were case‐oriented and were not supported by laboratory findings. The hierarchical framework developed in this paper serves as a basis for further laboratory and field studies on this issue.

Practical implications

The framework is conducive to the diagnosis of external wall tile delamination.

Originality/value

This paper reviews systematically and comprehensively the literature on the causes of external wall tile delamination.

Details

Structural Survey, vol. 23 no. 5
Type: Research Article
ISSN: 0263-080X

Keywords

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Article
Publication date: 13 October 2020

Zoi G. Ralli and Stavroula J. Pantazopoulou

Important differentiating attributes in the procedures used, the characteristic mineral composition of the binders, and the implications these have on the final long term…

Abstract

Purpose

Important differentiating attributes in the procedures used, the characteristic mineral composition of the binders, and the implications these have on the final long term stability and physico-mechanical performance of the concretes produced are identified and discussed, with the intent to improve transparency and clarity in the field of geopolymer concrete technologies.

Design/methodology/approach

This state-of-the-art review covers the area of geopolymer concrete, a class of sustainable construction materials that use a variety of alternative powders in lieu of cement for composing concrete, most being a combination of industrial by-products and natural resources rich in specific required minerals. It explores extensively the available essential materials for geopolymer concrete and provides a deeper understanding of its underlying chemical mechanisms.

Findings

This is a state-of-the-art review introducing the essential characteristics of alternative powders used in geopolymer binders and the effectiveness these have on material performance.

Practical implications

With the increase of need for alternative cementitious materials, identifying and understanding the critical material components and the effect they may have on the performance of the resulting mixes in fresh as well as hardened state become a critical requirement to for short- and long-term quality control (e.g. flash setting, efflorescence, etc.).

Originality/value

The topic explored is significant in the field of sustainable concrete technologies where there are several parallel but distinct material technologies being developed, such as geopolymer concrete and alkali-activated concrete. Behavioral aspects and results are not directly transferable between the two fields of cementitious materials development, and these differences are explored and detailed in the present study.

Details

International Journal of Structural Integrity, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1757-9864

Keywords

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Article
Publication date: 1 December 1989

When Boeing was finalising the design of the 747, which first flew in early 1969, discussions began in Europe to consider the design and construction of a short/medium…

Abstract

When Boeing was finalising the design of the 747, which first flew in early 1969, discussions began in Europe to consider the design and construction of a short/medium range large capacity European airliner.

Details

Aircraft Engineering and Aerospace Technology, vol. 61 no. 12
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 14 May 2018

Suvash Chandra Paul, Gideon P.A.G. van Zijl, Ming Jen Tan and Ian Gibson

Three-dimensional printing of concrete (3DPC) has a potential for the rapid industrialization of the housing sector, with benefits of reduced construction time due to no…

Abstract

Purpose

Three-dimensional printing of concrete (3DPC) has a potential for the rapid industrialization of the housing sector, with benefits of reduced construction time due to no formwork requirement, ease of construction of complex geometries, potential high construction quality and reduced waste. Required materials adaption for 3DPC is within reach, as concrete materials technology has reached the point where performance-based specification is possible by specialists. This paper aims to present an overview of the current status of 3DPC for construction, including existing printing methods and material properties required for robustness of 3DPC structures or structural elements.

Design/methodology/approach

This paper has presented an overview of three categories of 3DPC systems, namely, gantry, robotic and crane systems. Material compositions as well as fresh and hardened properties of mixes currently used for 3DPC have been elaborated.

Findings

This paper presents an overview of the state of the art of 3DPC systems and materials. Research needs, including reinforcement in the form of bars or fibres in the 3D printable cement-based materials, are also addressed.

Originality/value

The critical analysis of the 3D concrete printing system and materials described in this review paper is original.

Details

Rapid Prototyping Journal, vol. 24 no. 4
Type: Research Article
ISSN: 1355-2546

Keywords

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Article
Publication date: 1 September 1962

Observations on alloy tests. Rotating‐cantilever tests in air and corrosion‐fatigue tests have been made on a high‐purity aluminium‐zinc‐magnesium alloy and on a…

Abstract

Observations on alloy tests. Rotating‐cantilever tests in air and corrosion‐fatigue tests have been made on a high‐purity aluminium‐zinc‐magnesium alloy and on a commercial alloy (D.T.D. 683) in various conditions of heat treatment. The results are compared with special reference to the form of fracture and microstructure. Evolution of gas from active slip zones under corrosion fatigue has been observed.

Details

Anti-Corrosion Methods and Materials, vol. 9 no. 9
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 August 1960

F.P.A. Robinson

As pitting corrosion is probably the most damaging type of wet corrosion, an understanding throughout industry of this phenomenon, which is the condition between complete…

Abstract

As pitting corrosion is probably the most damaging type of wet corrosion, an understanding throughout industry of this phenomenon, which is the condition between complete immunity to attack and general corrosion, is essential. This article is concerned with pitting corrosion in general, but it also contains the results of some original research recently completed by the author on the corrosion pitting of stainless steels.

Details

Anti-Corrosion Methods and Materials, vol. 7 no. 8
Type: Research Article
ISSN: 0003-5599

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Article
Publication date: 1 August 1960

D.L. Burns, R.L. Hildebrand and P.D. Thomas

Presented herein is information developed by a panel of the Sub‐Committee on Corrosion of the American Institute of Petroleum concerned with the mechanism of corrosion…

Abstract

Presented herein is information developed by a panel of the Sub‐Committee on Corrosion of the American Institute of Petroleum concerned with the mechanism of corrosion inhibition, temperature limitations, detergent action and chemical composition of the high‐molecular‐weight organic inhibitors commonly used in process streams. Included is a literature survey on the mechanism of corrosion inhibition; refinery experiences with inhibitors as developed by a questionnaire; and information contributed by manufacturers of inhibitors. Other data pertinent to corrosion and inhibitor problems are discussed.

Details

Anti-Corrosion Methods and Materials, vol. 7 no. 8
Type: Research Article
ISSN: 0003-5599

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