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RISS 인기검색어
- 검색키워드
- 저자 : Mehmet Ayvaz (검색결과 4 건)
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Mehmet Ayvaz 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.3
In the future, hybrid aluminum matrix composites, which are the second generation composites, will be replaced by solidreinforced third-generation quaternary hybrid composites in which nano- and micro-scale reinforcement particles are usedtogether. In this study, microwave sinterability of B4C,TiO2(nm + μm), and nGr reinforced quaternary hybrid compositesthat had AlCu4.5SiMg alloyed Matrix, and their microstructural and tribological properties after sintering were examined. The proportion of nGr in the composite sample was taken as 0.5 wt%, while B4Cand TiO2were used in three different proportions(3, 9, 12 wt%). After being compressed under 600 MPa pressure, the composite samples were sintered for 60 minat 550 °C by a microwave oven with a power of 2.9 kW and a frequency of 2.45 GHz. It was determined that due to its highmicrowave absorbency, B4Creinforcement improved the microwave sinterability more compared to TiO2. In XRD analyses,whereas Al4C3and Al3BCreaction products were not seen as harmful, the intermetallic phase of Al2Cuwas detected. Itwas determined that both friction coefficient and wear resistance increased as the proportion of B4Cincreased in compositesamples. In AlCu4.5SiMg–(12 wt% B4C/3 wt% TiO2/0.5 wt% nGr) quaternary hybrid composites with the highest hardness(97.6 HV), the lowest specific wear rate (0.118 mm3 Nm × 10−3) was detected.
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Mehmet Ayvaz,Caglar Yilgor,Musa Ugur Mermerkaya,Ali Konan,Erhan Sonmez,Rifat Emre Acaroglu 대한외과학회 2011 Annals of Surgical Treatment and Research(ASRT) Vol.81 No.6
Although the majority of forequarter amputations are performed for high-grade bone and soft tissue sarcomas or extensive osteomyelitis of the upper extremity, this radical operation may also be indicated for the curative treatment of recurrent breast cancer and for the palliation of locally advanced breast cancer. We report a male patient with metastatic breast adenocarcinoma who underwent simultaneous mastectomy and forequarter amputation for the management of both his primary and metastatic disease.
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Assessment of damages on a RC building after a big fire
Ada, Mehmet,Sevim, Baris,Yuzer, Nabi,Ayvaz, Yusuf Techno-Press 2018 Advances in concrete construction Vol.6 No.2
This paper presents a case study about the damages on the structural elements of a cast in place reinforced concrete (RC) building after a big fire which was able to be controlled after six hours. The fire broke off at the $2^{nd}$ basement floor of the building, which has five basements, one ground, and two normal floors. As a result of intensely stocked ignitable materials, it spread out to the all of the upstairs. In visual inspection, most of the typical fire damages were observed (such as spalling, net-like cracks, crumbled plasters, bared or visible reinforcement). Also, failures of the $2^{nd}$ basement columns were encountered. It has been concluded that the severity failures of the columns at the $2^{nd}$ basement caused utterly deformation of the building, which is responsible for the massive damages on the beam-column connections. All of the observed damages were categorized related to the types and presented separated regarding the floors. Besides to the visual inspection, the numerical analysis was run to verify the observed damaged on the building for columns, beams, and the connection regions. It is concluded from the study that several parameters such as duration of the fire, level of the temperature influence on the damages to the RC building. Also, it is highlighted by the study that if the damaged building is considered on the overall structural system, it is not able to satisfy the minimum service requirements neither gravity loads nor earthquake conditions.
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Emre Özer,Mehmet Ayvaz,Mustafa Übeyli,İbrahim Sarpkaya 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
In this research, the effects of heat treatment and hybrid reinforcement ratio on the microstructural and mechanical propertiesof Al–4Cu nanocomposites containing MWCNT and nano Al2O3pwere investigated. First of all, the hybrid reinforcedAl–4Cu nanocomposites were manufactured with the aid of mechanical alloying and microwave sintering. And then, theywere subjected to various heat treatments; annealing and artificial aging at 170, 180 and 200 °C individually. After that,the microstructural observations were made using X-ray diffraction, optical microscope and scanning electron microscopes(SEMs). The secondary electrons (SE), back scattered electrons (BSE), energy dispersive X-ray (EDX) and elemental mappinganalyses of the specimens were carried out with the aid of SEMs. In addition, the nanoindentation tests were done toget the nanohardness and elastic modulus of composites. Finally, the composites were subjected to the compression testto clarify their compressive properties. The Al2Cuand Al4C3precipitates were detected in the composite samples eitherannealed or peak-aged at 200 °C, while the intermetallic compound, Al7Cu2Fe,precipitated only in the aged samples. Asignificant increment in the nanohardness of composites was obtained with increasing reinforcement content. Moreover, theelastic modulus of annealed and peak-aged composites, reinforced with 15% hybrid reinforcement in volume, increased by59% and 57%, respectively compared to the unreinforced alloy. Furthermore, the use of hybrid reinforcement in the alloymatrix allowed an improvement of compressive yield strength at the expense of compressive strain.
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