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Molecular dynamic study of combined effects of diamond tool rake angle and duncut/Redge ratio on nanomachining behaviour of monocrystalline optical silicon 金刚石刀具前角和下切/锐比对单晶光学硅纳米加工行为联合影响的分子动力学研究
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.10026438
Lukman N. Abdulkadir, Khaled Abou El Hossein, M. Liman, Odedeyi Peter Babatunde, Abubakar I. Jumare
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引用次数: 3
Mechanical and wear surface characterisation of aluminium hybrid nanocomposite 铝杂化纳米复合材料的力学和磨损表面表征
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.10026435
I. Manivannan, S. Ranganathan, S. Gopalakannan, S. Suresh, D. Candane
The newly engineered metal matrix nanocomposite (MMNC) of Al6061 reinforced with 0.4 wt% SiC and 0.5 wt% Gr hybrid nanocomposites were synthesised by ultrasonic assisted stir casting method. The pin-on-disc equipment were conducted on the prepared samples to investigate the tribological behaviour of the hybrid nanocomposite. The hybrid nanocomposite and wear surfaces have been characterised by field emission scanning electron microscope (FESEM) equipped with an energy dispersive spectrometer (EDS), optical microscope (OM) and 3D profilometer to understand the wear mechanisms. This study shows the effectiveness of incorporation of graphite in the hybrid nanocomposite for reduction of friction, wear and surface roughness. With the introduction of nano SiC and Gr particles into matrix alloy, the number and depth of grooves in worn surface of hybrid nanocomposites decreased. The Al/0.4SiC/0.5Gr hybrid nanocomposite showed superior tribological properties and self-lubricating ability compared to the matrix alloy.
采用超声辅助搅拌铸造法制备了0.4 wt% SiC和0.5 wt% Gr复合材料增强Al6061金属基纳米复合材料。采用针盘式装置对制备的样品进行摩擦磨损性能研究。利用场发射扫描电子显微镜(FESEM)、能谱仪(EDS)、光学显微镜(OM)和三维轮廓仪对混合纳米复合材料和磨损表面进行了表征,以了解磨损机理。该研究表明,在杂化纳米复合材料中加入石墨对于减少摩擦、磨损和表面粗糙度是有效的。在基体合金中引入纳米SiC和纳米Gr颗粒后,杂化纳米复合材料磨损表面的沟槽数量和深度均有所减少。与基体合金相比,Al/0.4SiC/0.5Gr杂化纳米复合材料具有优异的摩擦学性能和自润滑性能。
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引用次数: 1
Modelling and optimisation of adhesive bonded joint strength of composites for aerospace applications 航空航天用复合材料粘接接头强度建模与优化
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.104694
R. Hanumantharaya, I. Sogalad, S. Basavarajappa, G. C. Patel
In recent past, adhesive bonding gain much attention world-wide in joining of engineered parts namely, automotive and aerospace structures. The strength of adhesive bonded composite joints is studied by conducting experiments based on the matrices of central composite design. The collected data was analysed using response surface methodology. The mathematical model was established to express the load carrying capacity and joint strength as a function of input variables. Further, analysis of variance was carried out to ensure good fit to the experimental data. Moreover, the statistical methods determine significant interaction effects among the factors. Finally, genetic algorithm was used to locate the optimum points of joint strength for the set of inputs, i.e., 40 mm overlap length, 0.2 mm adhesive thickness and 4.526 μm surface roughness. The results showed that adhesively bonded single lap joints strength was influenced by overlap length (8%), adhesive thickness (78.56%), and surface roughness (1.43%). Statistical experimental design techniques were found to be useful in understanding the complex relationships seen in the data, and also in interpreting the results.
近年来,粘接技术在汽车和航空航天结构等工程部件的连接中受到了广泛的关注。基于中心复合材料设计矩阵,对胶结复合材料接头的强度进行了试验研究。采用响应面法对收集的数据进行分析。建立了承载能力和节点强度随输入变量变化的数学模型。进一步进行方差分析,确保与实验数据吻合良好。此外,统计方法确定了各因素之间显著的交互效应。最后,利用遗传算法对输入集的最优结合点进行定位,即重叠长度为40 mm,粘接厚度为0.2 mm,表面粗糙度为4.526 μm。结果表明:胶合单搭接接头强度受重叠长度(8%)、胶合厚度(78.56%)和表面粗糙度(1.43%)的影响;统计实验设计技术在理解数据中的复杂关系以及解释结果方面被发现是有用的。
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引用次数: 4
Numerical analysis of stress-induced and concentration-dependent carbon diffusion in low-temperature surface carburisation of 316L stainless steel 316L不锈钢低温表面渗碳过程中应力诱导和浓度相关碳扩散的数值分析
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.10023224
Yawei Peng, J. Gong, Yong Jiang, D. Rong, Minghui Fu
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引用次数: 0
Influence of tool rotation speed on microstructural characteristics and mechanical properties of friction stir welded AA2014-T6 aluminium alloy 刀具转速对搅拌摩擦焊接AA2014-T6铝合金组织特征和力学性能的影响
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.10026437
C. Rajendran, R. Guru, S. Kavin, P. Navanithan, P. N. Kalathil
Friction stir welding (FSW) is a promising solid-state welding process for precipitation hardening and high strength aluminium alloys. An experimental and theoretical investigation was carried out to check the significance of tool rotation speed on microstructural characteristics and tensile properties of high-strength alloy AA2014. FSW joints were made with varying tool rotation speed from 1,100 rpm to 1,900 rpm with an equal increment of 200 rpm, while the other parameters such as welding speed, shoulder diameter and tool tilt angle were kept constant. The strength of FSW joints was correlated with microhardness, microstructure and fractographs. The joint fabricated with the tool rotation speed of 1,500 rpm, welding speed of 50 mm/min, shoulder diameter of 6 mm and tool tilt angle of 1.5° exhibited superior strength (376 MPa) than the other joints. It could be achieved by the balanced flow of material and defect-free in the stir zone.
搅拌摩擦焊(FSW)是一种很有前途的用于沉淀硬化高强度铝合金的固态焊接工艺。通过实验和理论研究,验证了刀具转速对高强合金AA2014显微组织特征和拉伸性能的影响。在保持焊接速度、焊肩直径、刀具倾斜角度等参数不变的情况下,在1100 ~ 1900 rpm范围内以200 rpm为等量增量加工FSW接头。摩擦焊接头的强度与显微硬度、显微组织和断口形貌有关。当刀具转速为1500 rpm,焊接速度为50 mm/min,焊肩直径为6 mm,刀具倾角为1.5°时,接头强度为376 MPa。它可以通过物料流动平衡和搅拌区无缺陷来实现。
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引用次数: 0
Effect of weld parameters on joint strength of 904L grade steel using resistance spot welding 焊接参数对904L级钢电阻点焊接头强度的影响
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.10026436
V. Kalyankar, Nitin Chouhan
Experimental investigation on resistance spot welding of 904L super austenitic stainless steel, which is finding its considerable applicability in automobile sector, is presented in this work. However, joining of this material involves difficulties due to complex working range of process parameters leading to critical mechanical and metallurgical changes in the weld joint. More focus is given on effect of important process parameters like weld time, current, electrode pressure and squeeze time on strength of weld joint. A mathematical model is proposed to understand the combined effect of multiple processing parameters on tensile shear strength (TSS) which can be beneficial to scientific community to get enhanced results. For the present setup, more significant parameter is electrode pressure followed by other parameters. TSS decreases with increase in electrode pressure up to certain level and then starts increasing while TSS increases with increase in squeeze time and subsequently it remains constant.
对904L超级奥氏体不锈钢的电阻点焊进行了试验研究,发现其在汽车领域具有相当大的适用性。然而,由于复杂的工艺参数的工作范围导致焊接接头的关键力学和冶金变化,这种材料的连接遇到了困难。重点研究了焊接时间、电流、电极压力、挤压时间等重要工艺参数对焊缝强度的影响。提出了多种工艺参数对材料抗拉抗剪强度综合影响的数学模型,为科学研究提供了理论依据。在目前的设置中,最重要的参数是电极压力,其次是其他参数。TSS随着电极压力的增加而减小,达到一定程度后开始增大,随着挤压时间的增加TSS逐渐增大并保持不变。
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引用次数: 0
Comparison of RSM and ANN model in the prediction of the tensile shear failure load of spot welded AISI 304 /316 L dissimilar sheets RSM与ANN模型预测AISI 304 / 316l异种薄板点焊拉伸剪切破坏载荷的比较
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.10023123
V. Murugesan, A. Perumal
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引用次数: 1
Thermo-mechanical evaluation of plasma sprayed YSZ-based multi-layered thermal barrier coatings 等离子喷涂ysz基多层热障涂层的热力学性能评价
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.104701
Debasis Das, R. Verma, Vipul Pathak
The multi-layered YSZ, NiCoCrAlY, Cr2O3 and Al2O3 coatings of varying thickness (200 μm-400 μm) have been investigated for thermal barrier coating (TBC) application. Plasma spray technique has been utilised on piston crown to optimise the thermal fatigue life in view to reduce the heat losses. Four types of TBC overlay each with a 100 μm NiCrAlY bond coat were deposited on the A336 aluminium alloy substrate cut out of the diesel engine piston. The phase composition of coatings before and after the thermal shock testing was analysed by XRD and the lattice strain analysis was performed by Williamson-Hall analysis. It was observed that among the considered multi-layered coating configurations, those with 300 μm YSZ and 200 μm Cr2O3 top coat exhibited acceptable thermal shock resistance as the specimens sustain up to 298 and 325 thermal cycles respectively. The microstructural analysis suggested against the formation of any major deformity or structural changes at the higher temperature as investigated by thermal shock experiment.
研究了不同厚度(200 μm-400 μm)的YSZ、NiCoCrAlY、Cr2O3和Al2O3多层涂层在热障涂层(TBC)中的应用。采用等离子喷涂技术对活塞冠进行热疲劳处理,以提高活塞冠的热疲劳寿命,减少活塞冠的热损失。在从柴油机活塞上切割出来的A336铝合金基体上,沉积了四种类型的TBC覆盖层,每种覆盖层都具有100 μm的NiCrAlY粘结层。采用XRD分析了热冲击试验前后涂层的相组成,采用Williamson-Hall分析了涂层的晶格应变。结果表明,在多层涂层结构中,表面涂层为300 μm YSZ和200 μm Cr2O3的涂层具有良好的抗热冲击性能,分别可承受298次和325次热循环。显微组织分析表明,热冲击实验表明,高温下不会形成任何主要的变形或结构变化。
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引用次数: 1
Effect of cutting parameters on surface roughness in ultra-high precision turning of a contact lens polymer 超高精密车削隐形眼镜聚合物时切削参数对表面粗糙度的影响
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/ijcmsse.2019.10026432
M. Liman, K. Abou-El-Hossein, Lukman N. Abdulkadir, P. B. Odedeyi, Abubakar I. Jumare
This paper studies the effect of cutting parameters on surface generation in ultra-precision turning of a contact lens polymer. Contact lens manufacture wants high accuracy and high surface quality. Surface roughness is mostly used to measure the index quality of a turning process. It has been an important response because it has direct influence toward the part performance and the production cost. Hence, choosing optimal cutting parameters will not only improve the quality measure but also the productivity. This research work is therefore aimed at investigating the effect of cutting parameters (cutting speed, feed rate and depth of cut) on surface roughness of RGP ONSI-56 contact lens polymer with a monocrystalline diamond cutting tool. In this work, cutting speed (A) is found to be the most dominant factor having the highest degree of significance followed by the square of the cutting speed (A2) and the feed rate (B). However, interaction between cutting speed and feed rate (AB) has the lowest degree of significance on the surface roughness.
研究了隐形眼镜聚合物超精密车削加工中切削参数对表面生成的影响。隐形眼镜制造要求高精度和高表面质量。表面粗糙度主要用来衡量车削过程的指标质量。它直接影响到零件的性能和生产成本,已成为一个重要的回应。因此,选择最优的切削参数不仅可以提高质量指标,还可以提高生产率。因此,本研究工作旨在研究切削参数(切削速度、进给速度和切削深度)对RGP ONSI-56隐形眼镜聚合物表面粗糙度的影响。研究发现,切削速度(A)是最主要的影响因素,对表面粗糙度的影响程度最高,其次是切削速度(A2)和进给速度(B)的平方。而切削速度和进给速度(AB)之间的相互作用对表面粗糙度的影响程度最低。
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引用次数: 0
Simulation of the bite condition of AZ31 sheet rolling AZ31板材轧制咬合状态的模拟
Q3 Engineering Pub Date : 2018-10-04 DOI: 10.1504/IJCMSSE.2018.10016536
Z. Liu
Sheet rolling is a simple plastic deformation of which, there are many formulas to describe its bite condition, however, there is no rigorous theoretical analysis and result and the applying ranges of these formulas are limited. Although the bite condition is not an important problem in engineering or academy, it is really a term influenced by many factors and it is difficult, maybe impossible to be expressed by an equation. In this paper, by finite element software, the bite condition or the critical friction factor under different thicknesses of AZ31 sheet, rolling reduction, sheet temperature and roller temperature are calculated and with large result data, the change regulation of the bite condition appears which is shown in a colour brick model. This example shows that, avoiding rigorous theoretical analysis, a complex situation can be numerically illustrated well by finite element software.
薄板轧制是一种简单的塑性变形,有许多公式可以描述其咬入状态,但没有严格的理论分析和结果,这些公式的适用范围有限。虽然咬合条件在工程或学术上不是一个重要的问题,但它确实是一个受许多因素影响的术语,很难,甚至不可能用方程来表达。本文用有限元软件计算了不同厚度AZ31板材、轧制压下量、板材温度和轧辊温度下的咬入状态或临界摩擦系数,并用大量的结果数据表明,咬入状态的变化规律表现在彩砖模型中。这个例子表明,在避免严格的理论分析的情况下,有限元软件可以很好地对复杂的情况进行数值说明。
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引用次数: 0
期刊
International Journal of Computational Materials Science and Surface Engineering
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