Radek Doubrava, Martin Oberthor, Petr Bělský and Jan Raška
The purpose of this paper is to describe the approach for the design of a jet engine composite air inlet for a new generation of jet trainer aircraft from the perspective of…
Abstract
Purpose
The purpose of this paper is to describe the approach for the design of a jet engine composite air inlet for a new generation of jet trainer aircraft from the perspective of airworthiness requirements regarding high-speed impact resistance.
Design/methodology/approach
Validated numerical simulation was applied to flat test panels. The final design was optimised and verified by validated numerical simulation and verified by testing on a full-scale demonstrator. High-speed camera measurement and non-destructive testing (NDT) results were used for the verification of the numerical models.
Findings
The test results of flat test panels confirmed the high durability of the composite structure during inclined high-speed impact with a near-real jet inlet load boundary condition.
Research limitations/implications
Owing to the sensitivity of the composite material on technology production, the results are limited by the material used and the production technology.
Practical implications
The application of flat test panels for the verification and tuning of numerical models allows optimised final design of the air inlet and reduces the risk of structural non-compliance during verification tests.
Originality/value
Numerical models were verified for simulation of the real composite structure based on high-speed camera results and NDT inspection after impact. The proposed numerical model was simplified for application in a real complex design and reduced calculation time.
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Roman Ružek, Radek Doubrava and Jan Raška
Various types of damage or cracking in the structural components of an airframe can occur during the service lifetimes of aging aircraft. These types of damage are commonly…
Abstract
Purpose
Various types of damage or cracking in the structural components of an airframe can occur during the service lifetimes of aging aircraft. These types of damage are commonly repaired with a patch that can be joined to the original structure by different techniques, e.g., riveting and bonding. The purpose of this paper is to describe the repair of a fatigue crack in the metallic wing structure of a jet trainer aircraft using an adhesively bonded boron composite patch.
Design/methodology/approach
The partial analytical design and numerical analysis of the repair is presented. Three different versions of the patch are quantitatively investigated. The efficiency of the designed adhesively bonded boron patch with the parent metallic structure is experimentally verified by panel tests, and two different patch geometries and two surface preparation techniques are investigated. The panels were designed, manufactured and tested as representative structures of the repaired structure.
Findings
Adhesively bonded composite repair increases the lifetime by at least one order compared with the non-repaired structure. Both surface preparations provide equivalent results. The repair lifetime is significantly influenced by the patch geometry, and the longer patch significantly increases the lifetime of the panel. The lifetime of the structure can be increased by ˜40-fold if the patch geometry is a rectangle with 1:1.5 proportions of the sides (length in the crack direction/length perpendicular to the crack propagation). The patch length in the crack direction should be twice that of the initial crack length. Additional patch length extension in the direction that is perpendicular to the crack propagation does not appear to be effective for significantly decreasing the stress intensity factor and patch efficiency. The repair also retards the crack propagation if the crack grows out of the patch. No significant disbonding was detected.
Originality/value
The work described in this paper provides information that is very useful for patch design and verification with relation to different patch geometries and technologies. The designed and verified repair has been successfully applied to an L-39 Czech aircraft structure.
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This is a selective annotated bibliography of the literature on Christopher Columbus from 1970 to 1989. The subject is particularly relevant considering the approach of the…
Abstract
This is a selective annotated bibliography of the literature on Christopher Columbus from 1970 to 1989. The subject is particularly relevant considering the approach of the Quincentenary of the “discovery” of America in 1992. For that same reason, there has been an outpouring of literature on the subject since 1990, a significant subset of which contributes to are interpretation of Columbus the man, his voyages, and their impact on the new world. It is hoped that this more recent literature will be part of a subsequent annotated bibliography.
Among the general training issues featured in section one are: an analysis of the factory as a learning laboratory; advice on improving your training environment; a look at…
Abstract
Among the general training issues featured in section one are: an analysis of the factory as a learning laboratory; advice on improving your training environment; a look at training schemes for the homeless; and an explanation of the importance of debriefings in training exercises.
This special “Anbar Abstracts” issue of the Journal of Management Development is split into six sections covering abstracts under the following headings: General; Executive…
Abstract
This special “Anbar Abstracts” issue of the Journal of Management Development is split into six sections covering abstracts under the following headings: General; Executive Development; Management Education; Management Skills Training; Management Development Techniques; Career Management and Succession Planning.
Tom Hodgson and Andrew Garoogian
“Pamphlet material has some definite functions in college libraries and therefore should be accorded more consideration than it usually receives. Often librarians give this part…
Abstract
“Pamphlet material has some definite functions in college libraries and therefore should be accorded more consideration than it usually receives. Often librarians give this part of the collection very little thought, sometimes because of lack of time, but more often because they are not interested in such material and they fail to see the values of it.”
Halimin Herjanto and Muslim Amin
Deodorant, as a hygienic product, becomes a daily necessity product and has significant benefits to its users. Yet, the real motivation for consuming deodorant is not fully…
Abstract
Purpose
Deodorant, as a hygienic product, becomes a daily necessity product and has significant benefits to its users. Yet, the real motivation for consuming deodorant is not fully understood, and therefore, this study aims to join the extant literature in this context by investigating the effect of personal values.
Design/methodology/approach
A qualitative study using the laddering approach (means-end analytic) was used and 50 college students participated in this study.
Findings
The hierarchical value maps show that achievement, power, security and benevolent personal values are responsible for millennials deodorant consumption behavior. Fragrance, price and antiperspirant are the most important attributes that appeal to such consumption.
Practical implications
The findings also suggested that three different situational factors generated these different personal values. It includes a pre-career environment, puberty and maintaining self-stability. The strongest attributes that appeal to millennials are fragrance, price, antiperspirant, brand, long-lasting quality and packaging.
Originality/value
This study offers the means-end approach to the framework of millennials deodorant consumption behavior and which can be implemented to investigate millennials consumption decision-making processes.
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Hongjoo Woo, Seeun Kim and Michelle Lynn Childs
The purpose of this paper is to examine how cause-related marketing (CRM) messages with a global focus and a national focus influence perceived brand authenticity and…
Abstract
Purpose
The purpose of this paper is to examine how cause-related marketing (CRM) messages with a global focus and a national focus influence perceived brand authenticity and participation intentions among consumers across two countries, USA and South Korea, based on the social identity perspective. In addition, the study examines how perceived altruism of the brand mediates these relationships.
Design/methodology/approach
Hypotheses were tested by 2×2 between-subject quasi-experiment among about 260 US and Korean consumers. Data were analyzed using multivariate analyses of covariance (MANCOVA) and a moderated mediation analysis.
Findings
Results indicated that, overall, US consumers perceive higher brand authenticity and participation intentions toward CRM in than Korean consumers. Korean consumers perceived higher brand authenticity and participation intentions from a CRM message with a national focus, while US consumers did not have a significant preference between message focuses. According to the result of moderated mediation analysis, consumers’ perceived altruism toward the brand mediated the effects of interaction between message focus and consumer nationality.
Originality/value
This study provides a unique perspective about what specific kind of CRM message could be more effective for consumers in different cultures, and proposes a theoretical explanation of why such difference is observed based on consumers’ social identities and in-group favoritism.