The effect of task and ego orientation to athletic identity and anti social behavior of students and athletes

The present study examined the affect of task and ego orientation on athletic identity and anti social behavior of students and athletes. A total of 156 students (86 males and 70 females with a mean age of 16,5 years) and 150 athletes (90 males and 60 females with a mean age of 18,5 years) participated at the study. The study was conducted from December 2012 to February 2013 during a basketball school tournament at the premises of Anatolia College for students and during local championships for athletes. TEOSQ (The Task and Ego Orientation in Sport Questionnaire) by Nicholls (1989) was used for the assessment of goals, the A.I.M.S. (Athletic Identity Measurement Scale) by Brewer et al,(1993 ) for athletic identity and the questionnaire by M.Kavussanu (pro-social and antisocial behavior 2006) was used for antisocial behaviour. All questionnaires have been previously used for similar studies in Greece. Results showed that task and ego orientation as well as identity affect antisocial behavior. Differences among athletes and students were observed only on athletic identity, while regarding the two sexes boys showed higher scores on antisocial behavior and aggression in relation to girls

Defect Detection and Imaging in Composite Structures Using Magnetostrictive Patch Transducers

The use of thin magnetostrictive patches to generate and detect guided waves within the composite samples is investigated for defect detection. This approach has been implemented using SH0 shear horizontal guided waves in both CFRP and GFRP plates. A magnetostrictive patch transducer was able to generate SH0 waves with known directional characteristics. The synthetic aperture focusing technique (SAFT) was then used to reconstruct images of defects using multiple transmission and detection locations. The results for imaging defects in both types of material are presented.“NDTonAIR” Marie Skłodowska Curie Training Network in Non-Destructive Testing and Structural Health Monitoring of Aircraft structures (MSCA-ITN) under the action H2020-MSCA-ITN-2016- under Grant number 722134

Acquisition and interpretation of dielectric data for thermoset cure monitoring

The interpretation and modelling of the dielectric response of thermosetting materials during cure was the main focus of this study. The equivalence of complex permittivity and complex impedance in terms of information content was outlined in a series of case studies covering the separate effects of dipolar movements and charge migration as well as the combined effect of the two polarisation mechanisms. Equivalent electrical circuits were used in order to model the evolution of the complex impedance during cure. A numerical method that can model consecutive spectra throughout the cure was developed. The method is based on Genetic Algorithms and requires only input from the modelling of the initial spectra. Complex impedance spectra were collected during the cure of a commercial epoxy resin formulation under isothermal and dynamic heating conditions. The spectra were analysed and modelled. The modelling was successful over the whole frequency range of the measurements (1 Hz – 1 MHz). The analysis of the estimated model parameters showed that charge migration dominates the dielectric response in a wide frequency range. In addition, the modelling algorithm also distinguished between the effects of electrode polarisation and dipolar movements in the signal. A new equivalent circuit was used in order to map the frequency regions where the each one of the three phenomena that together comprise the dielectric signal can be monitored most effectively. A chemical cure kinetics model was developed for the studied system. A correlation between the maximum point of the imaginary impedance spectrum and the reaction conversion was established. A mathematical model, based on a simple linear dependence of the dielectric signal on conversion and temperature, was built. The model predictions agreed well with the experimental data. The aim of simplifying the interpretation of the dielectric signals led to the development of a new experimental technique. Temperature Modulated Dielectric Analysis employs temperature modulations superimposed on an underlying thermal profile in order to separate the influence on the signal of the temperature alone from that of the cure reaction. The early study carried out here shows that such measurements are feasible and reveals important issues for its further development.EThOS - Electronic Theses Online ServiceEPSRCGBUnited Kingdo

Defects and uncertainties of adhesively bonded composite joints

© The Author(s) 2021. The increasing use of fibre reinforced polymer composite materials in a wide range of applications increases the use of similar and dissimilar joints. Traditional joining methods such as welding, mechanical fastening and riveting are challenging in composites due to their material properties, heterogeneous nature, and layup configuration. Adhesive bonding allows flexibility in materials selection and offers improved production efficiency from product design and manufacture to final assembly, enabling cost reduction. However, the performance of adhesively bonded composite structures cannot be fully verified by inspection and testing due to the unforeseen nature of defects and manufacturing uncertainties presented in this joining method. These uncertainties can manifest as kissing bonds, porosity and voids in the adhesive. As a result, the use of adhesively bonded joints is often constrained by conservative certification requirements, limiting the potential of composite materials in weight reduction, cost-saving, and performance. There is a need to identify these uncertainties and understand their effect when designing these adhesively bonded joints. This article aims to report and categorise these uncertainties, offering the reader a reliable and inclusive source to conduct further research, such as the development of probabilistic reliability-based design optimisation, sensitivity analysis, defect detection methods and process development

Simulation of damage on carbon fibre laminates using the Ladevèze material model

This paper focuses on the development of a numerical model based on the Ladevèze material model for the design of purposely introduced weak points/defects and the prediction and manipulation of its failure response. To identify mechanical properties and damage parameters mechanical testing on carbon prepreg coupons was carried out. The experimental work involved tensile testing at 0°, compression testing at 0°, cyclic in-plane shear testing at ±45°,+45° and ±67.5° fibre orientation. The cyclic tests involved five load-unload cycles with increasing load levels for the identification of the elastic damaging behaviour and furthermore the inelastic behaviour of the system. Mode I and Mode II samples were also manufactured for the characterisation of fracture toughness and the description of delamination. Out of these tests the identified material parameters, damage and coupling factors were introduced on the model. The model which was implemented in the Pam-CrashTM [1] finite element solver was verified for fibre damage under tension and compression. The case of shear loading was also studied and verified taking into account matrix shear and transverse damage evolution, which are coupled through the implementation of a factor.Lloyd’s Register Foundation; UK Department for Business, Innovation and Skills (BIS) Regional Growth Fund (RGF); Higher Education Funding Council for England (HEFCE) ; Structural Integrity Research Foundation (SIRF)

The affect of task and ego orientation to athletic identity and anti social behavior of students and athletes

The present study examined the affect of task and ego orientation on athletic identity and anti social behavior of students and athletes. A total of 156 students (86 males and 70 females with a mean age of 16,5 years) and 150 athletes (90 males and 60 females with a mean age of 18,5 years) participated at the study. The study was conducted from December 2012 to February 2013 during a basketball school tournament at the premises of Anatolia College for students and during local championships for athletes.  TEOSQ (The Task and Ego Orientation in Sport Questionnaire) by Nicholls (1989) was used for the assessment of goals, the  A.I.M.S. (Athletic Identity Measurement Scale) by Brewer et al,(1993 ) for athletic identity and the questionnaire by M.Kavussanu (pro-social and antisocial behavior 2006) was used for antisocial behaviour. All questionnaires have been previously used for similar studies in Greece. Results showed that task and ego orientation as well as identity affect antisocial behavior. Differences among athletes and students were observed only on athletic identity, while regarding the two sexes boys showed higher scores on antisocial behavior and aggression in relation to girls