http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Faramarz Ashenai Ghasemi (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Free vibration and buckling analysis of elastically restrained FG-CNTRC sandwich annular nanoplates
Kolahdouzan, Farzad,Mosayyebi, Mohammad,Ghasemi, Faramarz Ashenai,Kolahchi, Reza,Panah, Seyed Rouhollah Mousavi Techno-Press 2020 Advances in nano research Vol.9 No.4
An accurate plate theory for assessing sandwich structures is of interest in order to provide precise results. Hence, this paper develops Layer-Wise (LW) theory for reaching precise results in terms of buckling and vibration behavior of Functionally Graded Carbon Nanotube-Reinforced Composite (FG-CNTRC) annular nanoplates. Furthermore, for simulating the structure much more realistic, its edges are elastically restrained against in-plane and transverse displacement. The nano structure is integrated with piezoelectric layers. Four distributions of Single-Walled Carbon Nanotubes (SWCNTs) along the thickness direction of the core layer are investigated. The Differential Quadrature Method (DQM) is utilized to solve the motion equations of nano structure subjected to the electric field. The influence of various parameters is depicted on both critical buckling load and frequency of the structure. The accuracy of solution procedure is demonstrated by comparing results with classical edge conditions. The results ascertain that the effects of different distributions of CNTs and their volume fraction are significant on the behavior of the system. Furthermore, the amount of in-plane and transverse spring coefficients plays an important role in the buckling and vibration behavior of the nano-structure and optimization of nano-structure design.
-
Wear Behavior of Biodegradable Mg–5Zn–1Y–(0–1)Ca Magnesium Alloy in Simulated Body Fluid
Asma Ghanbari,Hassan Jafari,Faramarz Ashenai Ghasemi 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.3
In this study, wear behavior of biodegradable Mg–5Zn–1Y–(0–1)Ca alloys is investigated in simulated body fluid. Weartest is performed using a pin-on-disc system, under three different loads of 10, 20 and 40 N, at ambient temperature; andthe whole configuration is exposed to simulated body fluid. The volumetric wear rate and friction coefficient of each alloyare determined. The worn surfaces are analyzed using a scanning electron microscope, equipped with an energy dispersivespectrometer to determine the involved main wear mechanism. The Ca-free alloy contains α-Mg and intermetallic Mg3YZn6,and Ca addition produces another intermetallic Ca2Mg6Zn3. Results show that different wear mechanisms and rates, as wellas friction coefficients, are achieved due to the effect of simulated body fluid on the alloys with regards to the different Cacontent and the presence of corrosion products. Microscopic studies reveal that abrasion is the dominant wear mechanismtaken place in all alloys under all loads. Increasing Ca content leads to wear resistance deterioration while increasing wearload results in decreasing wear rate and friction coefficient of the alloys. The results of the wear rate and friction coefficientof Mg–5Zn–1Y–1Ca alloy exhibit greater instability compared to the other alloys due to its more enhanced corrosion causedby the formation of the intermetallic Ca2Mg6Zn3particles. In total, Ca-free alloy provides the best wear resistance, especiallyat the higher wear load.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
