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    Alternative heat insulation method for rigid construction walls
    (2021) Dagdeviren, Abdullah; Acar, Bahadır; Aydin, Murat
    The purpose of heat insulation is to minimize the heat transfer between the interior and external\renvironment. Besides, it helps to prevent the structure of the constructions from the harmful heat effects\rbecause of heat transfer. This study presents an alternative method to achieve heat insulation in concrete\rwalls. 4 various heat insulation materials as wood shavings, fiberglass, granule rubber, and styrofoam were\radded into the concrete wall parts and an enclosed volume was created using those. The interior\rtemperature of the enclosed volume increased using resistance and the temperature was measured with a\rthermocouple as well. In order to calculate the thermal conductivity of heat-insulated walls, measured\rtemperature, power consumption, and surface area were used. As a result, it was shown that the wood\rshavings insulation in concrete had a lower thermal conductivity coefficient as 2,51 W/mK than others and\rmuch efficiency as well. In addition, the uncertainty of the thermal conductivity coefficient was calculated\rapproximately about ± 0,204 for all type of walls. Besides, the presented methodology could help to prevent\rlacking energy resources and to save economical incomes.
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    Application of Digital Image Correlation technique to Erichsen Cupping Test
    (Elsevier - Division Reed Elsevier India Pvt Ltd, 2018) Aydin, Murat; Wu, Xin; Cetinkaya, Kerim; Yasar, Mustafa; Kadi, Ibrahim
    Digital Image Correlation (DIC) technique is a powerful and useful tool in many industrial applications for both scientific and commercial purposes. It has been widely used for mechanical tests to understand the behaviour of material. In this study, 3D DIC technique was adopted to Erichsen Cupping Test (ECT) to measure the fracture cup height and demonstrate its benefits over traditional measurement techniques. Ck75 steel sheet with various material thickness was used in the experiments. The flat specimens were fixed in a closed die set-up and stretched along two directions until fracture. All the experiments were performed on a manually operated hydraulic press with a constant cross-head displacement and recorded with high resolution cameras. Finally, to determine the fractured cup heights, the accurate and satisfactory results were obtained through DIC measurements. The full-field thickness distribution and the maximum fracture forces were also determined. (C) 2018 Karabuk University. Publishing services by Elsevier B.V.