Browsing by Author "Akman, E"

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    Pulsed Nd:YAG laser shock processing effects on mechanical properties of 6061-T6 alloy
    Irizalp, SG; Saklakoglu, N; Akman, E; Demir, A
    The aim of this paper is to investigate effects of single and double shot Nd:YAG laser shock processing (LSP) on residual stress, micro-hardness and tensile properties of 6061-T6 aluminum alloy. The X-ray diffraction technique was used to measure surface residual stress in LSP-treated 6061-T6 samples. The magnitude and directional dependence of the surface residual stress after single shot and double shot LSP were investigated with the sin(2) Psi method. The results show that laser shock processing can significantly increase surface compressive residual stress. In addition, micro-hardness of the LSP-treated sample was measured using a Vickers diamond indenter depending on the depth. The tensile tests of the single shot and double shot LSP-treated and untreated samples were carried out by the Schimadzu tensile testing machine having a video extensometer. Experimental results show that the values of micro-hardness, tensile strength and uniform elongation increase by LSP. (C) 2013 Elsevier Ltd. All rights reserved.
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    Near surface modification of aluminum alloy induced by laser shock processing
    Saklakoglu, N; Irizalp, SG; Akman, E; Demir, A
    This paper investigates the influences of near surface modification induced in 6061-T6 aluminum alloy by laser shock processing (LSP). The present study evaluates LSP with a Q-switched Nd:YAG low power laser using water confinement medium and absorbent overlay on the workpiece. The near surface microstructural change of 6061-T6 alloy after LSP was studied. The residual stress variation throughout the depth of the workpiece was determined. The results showed an improvement of the material resistance to pit formation. This improvement may be attributed to compressive residual stress and work-hardening. The size and number of pits revealed by immersion in an NaOH-HCl solution decreased in comparison with the untreated material. (C) 2014 Elsevier Ltd. All rights reserved.
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    Psychological and sociocultural mechanisms of international students
    Seker, BD; Akman, E
    Purpose: The aim of this to investigate the various demographic characteristics, psychological and sociocultural mechanisms of international students in accordance with adaptation variables. Material and Methods: On the basis of the study, the associations among the psychological adaptation, sociocultural adaptation and perceived discrimination variables were examined. 187 international students from 28 different countries and six different faculties of Celal Bayar University took part as participants. Psychological adaptation examined with life satisfaction scale and sociocultural adaptation examined with Sociocultural Adaptation Scale which was adapted to Turkish in this study. Results: The results of the study revealed that international students' psychological and sociocultural adaptation was not found to be related. On the other hand, perceived discrimination was found to be positively associated with sociocultural adaptation. Conclusion: Psychological and sociocultural adaptation of students are not associated with each other. As students perceived discrimination level increases, they have more sociocultural adaptation difficulties.