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El-Cezeri Journal of Science and Engineering最新文献

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Investigation of Sheet Thickness and Punch Force in Die Surface Angled Hydro-mechanical Deep Drawing Method 模具面角液压机械拉深法板料厚度及冲力的研究
Q4 Engineering Pub Date : 2023-08-17 DOI: 10.31202/ecjse.1232536
Hasan BALLIKAYA, Vedat SAVAŞ, Çetin ÖZAY
In this study, the effect of die surface angled hydro-mechanical deep drawing method (HMDDM) on sheet metal cup wall thickness and punch force was investigated as experimental and numerical analysis. In the works, 0.9 mm thick DIN EN 10130-1999 sheet metal material was used. The effect of variables on the test results was investigated by using die surface/blank holder angle, punch nose radius, die shoulder radius, chamber pressure and blank holder force as experimental parameters. Numerical analysis experiments were carried out using ANSYS 15.0 package program. Besides, experiments were performed according to the Taguchi experiment plan and L18 orthogonal array. The obtained data were analysed statistically by ANOVA analysis of variance in MINITAB 17.0 package program, and the effect of each parameter on the results was determined as a percentage. As a result, it was determined that the thinning was approximately 15% at most and the thickening was 10%.
本文通过实验和数值分析,研究了模具面角液压机械拉深法(HMDDM)对板料杯壁厚和冲孔力的影响。工程中采用0.9 mm厚的DIN EN 10130-1999钣金材料。以模面/压边角、凸头半径、模肩半径、腔室压力和压边力为实验参数,研究了各变量对试验结果的影响。采用ANSYS 15.0包程序进行数值分析实验。根据田口实验方案和L18正交阵列进行了实验。所得数据采用MINITAB 17.0包程序方差分析进行统计学分析,以百分比确定各参数对结果的影响。因此,确定了减薄最多约为15%,增厚为10%。
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引用次数: 0
Comparison of Tribological Behaviours of Nano SiO2 and ZrO2 Reinforced Polyester Matrix Composite Materials 纳米SiO2与ZrO2增强聚酯基复合材料摩擦学性能比较
Q4 Engineering Pub Date : 2023-08-16 DOI: 10.31202/ecjse.1230975
Muhammet AYÇİÇEK, Sedef ÇAKIR AYÇİÇEK, Neslihan ÖZSOY, Murat ÖZSOY, Akın AKINCI
This paper aimed to examine and develop the tribological behaviour by adding nano reinforcements into the polyester matrix. Nanocomposite materials were obtained by adding nano-sized, 0.5%, 1%, 2% SiO2 and ZrO2 reinforcements to isophthalic polyester. These materials were mixed with mechanical and ultrasonic methods and poured into open moulds. The coefficient of friction and wear rates were obtained using the pin-on-disc test device. Optical and SEM surface images of the composites were examined. The experiments were conducted at room temperature and an average of 70% humidity. Tribological studies were made under a load of 2, 5, 10N and at a sliding speed of 0.5 and 0.1 m/s. It was seen that the nano reinforcements to the polyester matrix improved the tribological properties of the material.
本文旨在通过在聚酯基体中添加纳米增强材料来研究和发展其摩擦学性能。在间苯二甲酸聚酯中分别添加纳米级、0.5%、1%、2% SiO2和ZrO2增强剂,得到纳米复合材料。这些材料用机械和超声波的方法混合,倒进开模。采用针盘式试验装置获得了摩擦系数和磨损率。研究了复合材料的光学和扫描电镜表面图像。实验在室温下进行,平均湿度为70%。在2、5、10牛的载荷和0.5、0.1 m/s的滑动速度下进行了摩擦学研究。结果表明,纳米增强剂改善了聚酯基体的摩擦学性能。
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引用次数: 0
Investigation of Acid-Catalyzed Hydrolysis of 4-Nitrophenyl-N-Acetyl-4-Methylbenzenesulfonimidate in Dioxane-Water Solutions 酸催化4-硝基苯基- n -乙酰基-4-甲基磺酰咪酯在二恶烷-水溶液中的水解研究
Q4 Engineering Pub Date : 2023-08-14 DOI: 10.31202/ecjse.1269612
Seyhan ÖZTÜRK, Halil KÜTÜK
The hydrolysis of 4-nitrophenyl N-acetyl-4-methylbenzenesulfonimidate in aqueous 20%, 40%, and 60% (v/v) dioxane solutions of mineral acids was investigated. Rate maxima are observed for both perchloric and sulfuric acids since hydrolysis was studied over a wider range of acidity in 20%, and 40% (v/v) dioxane. Similarly, rate maxima are observed perchloric and hydrochloric acid in 60% (v/v) dioxane at high acid concentration. Analyses of the data by the Cox–Yates excess acidity method and temperature effects indicate hydrolysis by an A-2 mechanism.
研究了4-硝基苯基n -乙酰基-4-甲基苯磺酰咪酯在20%、40%和60% (v/v)二氧六环无机酸水溶液中的水解反应。由于在20%和40% (v/v)二氧六环较宽的酸度范围内进行了水解研究,因此观察到高氯酸和硫酸的水解速率最大值。同样,高氯酸和盐酸在60% (v/v)的二氧六环中,在高酸浓度下,速率最大值也被观察到。通过Cox-Yates过酸法和温度效应对数据的分析表明,水解是通过A-2机制进行的。
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引用次数: 0
Simple Soil Effect Analysis in a Base and Mid-Story Isolated 15 Story Building 基础与中层隔震15层建筑简单土效应分析
Q4 Engineering Pub Date : 2023-05-24 DOI: 10.31202/ecjse.1230014
Arcan YANIK, Hakan TOPALOĞLU
In this study the effect of soil-structure interaction on seismic performance is investigated considering a 15 story building incorporating base and mid-story seismic isolation. The cases that are taken into account are; fixed base model, base isolated model and base and mid-story isolated model. All three models are analyzed by excluding and including soil-structure interaction. Three different earthquakes are used for the time-history analysis. It is concluded that the seismic performance is enhanced by the implementation of base and mid-story isolation to the structure. In addition, it is observed that soil-structure interaction had a small effect on seismic performance of the structure depending on the base soil type.
在本研究中,研究了土-结构相互作用对抗震性能的影响,考虑了一个15层建筑的基础和中层隔震。考虑的情况有:固定基础模型,基础隔离模型和基础和中层隔离模型。这三种模型都是通过排除和考虑土-结构相互作用来分析的。三个不同的地震被用于时程分析。通过对结构进行底层和中层隔震,提高了结构的抗震性能。此外,根据地基土类型的不同,土-结构相互作用对结构抗震性能的影响较小。
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引用次数: 0
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El-Cezeri Journal of Science and Engineering
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