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    Experimental Performance of RC Beams Strengthened with Aluminum Honeycomb Sandwich Composites and CFRP U-Jackets
    (Springer, 2023) Kantarci, M.; Maras, M. M.; Ayaz, Y.
    This study aims to investigate the flexural behavior of reinforced concrete (RC) beams strengthened using aluminum honeycomb sandwich panels (AHSPs) with three different thicknesses (6, 10, and 15 mm) and CFRP U-Jackets with different cross-section configurations (i.e. support and middle sections). The experimental performance of RC beams was evaluated utilizing AHSPs and CFRP composites under four-point bending tests. The strengthened RC beams (HCRC-2-HCRC-10) were compared with the control beam (HCRC-1) in terms of flexural load carrying capacity, ductility, failure modes, and cracks patterns. The results revealed that the HCRC-9 beam specimen strengthened using 15 mm thickness AHSP displayed higher flexural performance than its counterparts. The HCRC-9 beam exhibited more ductile behavior, which depends on the failure mode. Strengthening with AHSP decreased visible width shear cracks compared to the un-strengthened beam. It was also detected that increase in the thickness of AHSP improved the flexural behavior of RC beams.
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    Mechanical behaviour of adhesively repaired pipes subject to internal pressure
    (Elsevier Sci Ltd, 2017) Citil, S.; Ayaz, Y.; Temiz, S.; Aydin, M. D.
    Pipes can crack over time, particularly in areas with pipefittings and joints subject to high pressure and unsteady temperatures. Repair of these cracks requires labour, time, and expense and the cracked pipes are currently repaired with two methods. The first method is cutting out the damaged section of the pipe and adding an additional joint, which requires much time and labour. The second method is replacing the damaged pipe, which requires expensive materials. The aim of this study is to propose an alternative method that reduces or eliminates the use of labour, time, and materials, in order to quickly re-activate pipelines. For this purpose, the cracked steel pipes were repaired by using an adhesive, and the mechanical,behaviours of the repaired pipes were investigated experimentally and numerically. In the first step of the study, artificial cracks were created on the pipes and the cracked pipes were repaired using adhesive and galvanized steel patches with different overlap lengths, overlap angles and thicknesses. Then, the repaired pipes were subjected to internal pressure in order to evaluate the effects of patch thickness, overlap angle and overlap length on the joint strength. Finally, the numerical analyses and experimental results show that the variation of the patch thickness, overlap length and overlap angle will change the stress distributions and strength of the adhesively repaired pipes.
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    Repair of small damages in steel pipes with composite patches
    (Wiley-V C H Verlag Gmbh, 2016) Ayaz, Y.; Citil, S.; Sahan, M. F.
    The temperature change, internal pressure and corrosion are main reason of cracks in pipes. Removal of damaged pipes with new ones gives rise to major disruption during operation. This causes loss of time and cost. This study aims to prevent crack propagation and to obtain fast repair in damaged area, at the beginning of the damage. Repair of small cracks in steel pipes using composite patches has been studied in this work. The aim of the study is to repair small cracks less than 8 mm length. For this purpose, holes with 8 mm diameters were drilled in 170 mm long pipes and composite patches with 2, 2.6 and 3.2 mm thickness and 35, 40 and 45 mm overlap lengths with 60, 90 and 120 degrees overlap angles were attached with an adhesive of 0.2 mm thickness. The repaired pipes were subjected to internal pressure until damage occurred. A finite element model was developed and the numerical results were verified based on experiments. The repair of steel pipe with adhesive bonding was successfully achieved under high pressure with composite patches. The results show that the increase in overlap angle results in an increased surface area, and consequently an increase in failure load. Furthermore, the failure load increased with an increase in patch thickness. Additionally, it is seen that the failure load does not change significantly with increasing patch thickness.