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Frictional behaviour of AA7050/B4Cp hybrid composites AA7050/B4Cp杂化复合材料的摩擦性能
Q3 Engineering Pub Date : 2019-09-12 DOI: 10.1504/ijcmsse.2019.10023921
R. Ranjith, P. Giridharan, M. Subramanian
In this work, AA7050 aluminium alloy reinforced with SiCp was fabricated through the liquid stir casting technique. The influence of % reinforcement, sliding speed, applied load and sliding distance on friction coefficient was investigated using a pin on disc equipment with tests based on the design of experiments. The results revealed that the friction coefficient increases with an increase in % reinforcement. Sliding speed, load and distance follow the similar trend that is at saddle point it registers maximum and after that COF decreases with an increase in any of the above-said parameters. The result showed that the presence of a mechanical mixed layer reduces the coefficient of friction and it's broke down leads to an increase in friction factor. The presence of mechanical mixed layer was confirmed through EDAX analysis. A mathematical model for friction coefficient was developed using response surface methodology and the combined effect of process parameters was thoroughly analysed.
本工作采用液体搅拌铸造技术制备了SiCp增强的AA7050铝合金。在试验设计的基础上,采用销盘试验装置研究了配筋率、滑动速度、外加载荷和滑动距离对摩擦系数的影响。结果表明,摩擦系数随配筋率的增加而增大。滑动速度、载荷和距离遵循类似的趋势,即在鞍点处它记录最大值,并且在该趋势之后,COF随着上述任何参数的增加而减小。结果表明,机械混合层的存在降低了摩擦系数,而它的分解导致摩擦系数的增加。通过EDAX分析证实了机械混合层的存在。采用响应面法建立了摩擦系数的数学模型,并深入分析了工艺参数的综合影响。
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引用次数: 1
Erosive wear analysis of propeller blade coated with tungsten carbide cobalt by high-velocity oxy-fuel spray method 高速氧喷法分析碳化钨钴涂层螺旋桨叶片的冲蚀磨损
Q3 Engineering Pub Date : 2019-09-12 DOI: 10.1504/ijcmsse.2019.10023928
B. A. M. Pasha, Mohammed Kaleemulla, A. Roshan
In the present study, the erosive wear of boat propeller blades with tungsten carbide cobalt (WC-Co) coatings by high-velocity oxy-fuel (HVOF) under different erosive wear conditions were investigated and compared with the wear of uncoated one. The (WC-Co) coating was deposited on Al7034 T6 composite reinforced with (Al2O3) and (SiC) particle in different weight percentages. Micro hardness test was employed to determine the hardness of the composite substrate. Eroded surface of the substrate was examined through scanning electron microscope (SEM). Finite element modelling was used to analyse the fracture surface of the propeller blade. Impact analysis was used to determine the stresses induced and deformation evolution under various impact condition. It is shown that crack was initiated from the surface of the blade and finally damages the blade at velocity 500 m/s under cyclic loading. This damage causes the improper functioning of the propeller blade and induced aerodynamic forces to increase the vibrational amplitude of the rotor blade. Results show that (WC-Co) coated propeller blade predominant over the life of the uncoated blade.
研究了高速氧燃料(HVOF)对碳化钨-钴(WC-Co)涂层船用螺旋桨叶片在不同侵蚀磨损条件下的侵蚀磨损,并与未涂层的磨损进行了比较。将(WC-Co)涂层沉积在用不同重量百分比的(Al2O3)和(SiC)颗粒增强的Al7034-T6复合材料上。采用显微硬度试验测定了复合材料基体的硬度。用扫描电子显微镜(SEM)观察了基体的腐蚀表面。采用有限元模型对螺旋桨叶片的断裂面进行了分析。冲击分析用于确定在各种冲击条件下产生的应力和变形演变。结果表明,在循环载荷作用下,裂纹从叶片表面开始,最终以500 m/s的速度破坏叶片。这种损坏会导致螺旋桨叶片功能不正常,并导致空气动力增加转子叶片的振动振幅。结果表明,(WC-Co)涂层螺旋桨叶片在未涂层叶片的使用寿命中占主导地位。
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引用次数: 0
The deformation and residual stress simulation of dual laser-beam bilateral synchronous welding for Al-alloy aircraft panel structure 铝合金飞机面板结构双激光双向同步焊接变形及残余应力模拟
Q3 Engineering Pub Date : 2019-09-12 DOI: 10.1504/IJCMSSE.2019.10023923
X. Zhan, Yun Liu, Yao Meng, W. Ou, Yanhong Wei
This paper reports a numerical investigation of dual laser-beam bilateral synchronous welding (DLBSW) for T-joint structure of aircraft fuselage. Finite element numerical simulation of DLBSW is carried out to obtain suitable matching of welding parameters for civil aircraft panels which composed of 6156 aluminium alloy skin and 6056 aluminium alloy stringer. The distribution of welding residual stress and welding distortion on the aircraft panels are predicted and discussed. Three-dimensional finite element model of the panel containing three stringers has been developed to simulate the temperature field, residual stress distribution and welded panel distortion. It is simulated that three stringers are welded to base plate of the specimen through different welding sequences and the welding sequence with the smallest distortion is acquired.
本文对飞机机身T型接头结构的双激光双向同步焊接(DLBSW)进行了数值研究。为了获得由6156铝合金蒙皮和6056铝合金桁条组成的民用飞机壁板焊接参数的合适匹配,对DLBSW进行了有限元数值模拟。对飞机壁板焊接残余应力和焊接变形的分布进行了预测和讨论。建立了含有三个桁条的面板的三维有限元模型,模拟了温度场、残余应力分布和焊接面板变形。模拟了三根桁条通过不同的焊接顺序焊接到试件底板上,得到了变形最小的焊接顺序。
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引用次数: 0
Enhancing wear resistance of squeeze cast hybrid aluminium matrix (LM24-SiCp-coconut shell ash) composite 提高挤压铸造复合铝基(lm24 - sicp -椰壳灰)复合材料的耐磨性
Q3 Engineering Pub Date : 2019-09-12 DOI: 10.1504/IJCMSSE.2019.10022981
M. Arulraj, P. Palani, M. Sowrirajan
This experimental study focuses on processing of hybrid aluminium matrix (LM24-SiCp-coconut shell ash) composite for making castings through squeeze casting process. The primary objective was to analyse the influence of the process parameters namely reinforcement percentage, pouring temperature, squeeze pressure and mould temperature on wear resistance. Samples were cast for each experimental condition based on L9 (34) orthogonal array. Pin-on-disc apparatus was used to measure the wear rate. From analysis of variance (ANOVA), it was observed that reinforcement percentage and squeeze pressure were the process parameters making a noticeable improvement in wear resistance. A mathematical model representing the process was developed using nonlinear regression analysis. The optimum casting conditions were obtained through Taguchi method and genetic algorithm tool and the conditions were validated through the confirmation experiments. The results show that parametric conditions obtained through the optimisation tools exhibit about 20% improvement in wear resistance compared to the base alloy.
本试验研究采用挤压铸造工艺制备复合铝基(lm24 - sicp -椰壳灰)铸件。主要目的是分析工艺参数,即增强率,浇注温度,挤压压力和模具温度对耐磨性的影响。采用L9(34)正交阵列对各试验条件进行浇铸。采用针盘仪测量磨损率。从方差分析(ANOVA)中可以看出,增强率和挤压压力是显著提高耐磨性的工艺参数。利用非线性回归分析,建立了表征该过程的数学模型。通过田口法和遗传算法得到了最佳铸造工艺条件,并通过验证试验对其进行了验证。结果表明,通过优化工具获得的参数条件比基合金的耐磨性提高了约20%。
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引用次数: 7
The simulation for ultrasonic testing based on frequency-phase coded excitation 基于频率相位编码激励的超声检测仿真
Q3 Engineering Pub Date : 2019-08-14 DOI: 10.1504/IJCMSSE.2019.10023225
Xinyu Zhao, Jiaying Zhang, S. Cong, T. Gang
Large time-bandwidth product coded signal and pulse compression are introduced into ultrasonic testing. Linear frequency modulation (LFM) excitation is usually used to improve time resolution, but sidelobe should be suppressed to detect smaller flaws nearby. Barker coded excitation is usually used to suppress sidelobe, but time resolution of results is lower than LFM excitation. So frequency-phase coded excitation is proposed to obtain higher time resolution and lower sidelobe level. The proposed excitation signal is applying LFM to each sub-pulse of Barker code, and it is called LFM-B13. The results of simulations demonstrate that, time resolution of LFM-B13 excitation is approximately 40% higher than that of LFM excitation, and main sidelobe level of LFM-B13 excitation is approximately 4 dB lower than that of LFM excitation, when 60% bandwidth of 5 MHz central frequency transducers are used.
将大时宽乘积编码信号和脉冲压缩技术引入超声检测中。线性调频(LFM)激励通常用于提高时间分辨率,但应抑制旁瓣以检测附近较小的缺陷。巴克编码激励通常用于抑制旁瓣,但结果的时间分辨率低于线性调频激励。因此,为了获得更高的时间分辨率和更低的旁瓣电平,提出了频率相位编码激励。所提出的激励信号是将LFM应用于巴克码的每个子脉冲,它被称为LFM-B13。仿真结果表明,当使用60%带宽的5MHz中心频率换能器时,LFM-B13激励的时间分辨率比LFM激励高出约40%,LFM-B1 3激励的主旁瓣电平比LFM激发低约4dB。
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引用次数: 2
Comparative study on effects of slurry erosive parameters on plasma sprayed flyash-Al2O3 and flyash-SiC composite coatings on Al6061 alloy 浆液侵蚀参数对Al6061合金等离子喷涂粉煤灰- al2o3和粉煤灰- sic复合涂层影响的对比研究
Q3 Engineering Pub Date : 2019-08-14 DOI: 10.1504/IJCMSSE.2019.10023209
B. Naveena, R. Keshavamurthy, N. Sekhar
In this present investigation, an attempt has been made to study the potential use of plasma sprayed flyash-Al2O3 and flyash-SiC novel composite coatings on Al6061 alloys to mitigate slurry erosive wear. In this Taguchi's L27 statistical approach, the influence of various process parameters like, slurry concentration, slurry speed, impinging particle size and testing specimen on the slurry erosive wear in slurry with 3.5% NaCl solution were evaluated and analysed. The results obtained indicate that testing specimen and slurry concentration were greatly influencing on slurry erosive wear than slurry speed and particle size. Under all the test conditions studied, flyash-Al2O3 coatings on Al6061 alloy exhibited higher resistance to slurry erosive wear when compared with flyash-SiC coated and uncoated Al6061. Mathematical models were developed by means of regressive analysis to predict the slurry erosive wear of developed composite coatings. This will enable the predictive design of important products with the minimum of wastage and maximum utilisation of sustainable materials using environmentally friendly processes.
在本研究中,试图研究等离子喷涂粉煤灰-Al2O3和粉煤灰-SiC新型复合涂层在Al6061合金上减轻浆料侵蚀磨损的潜在用途。采用田口L27统计方法,评价和分析了浆液浓度、浆液速度、冲击粒度和试样等工艺参数对3.5%NaCl溶液浆液中浆液侵蚀磨损的影响。结果表明,试件和浆液浓度对浆液冲蚀磨损的影响比对浆液速度和粒径的影响更大。在所研究的所有试验条件下,与粉煤灰SiC涂层和未涂层的Al6061相比,Al6061合金上的粉煤灰-Al2O3涂层表现出更高的抗浆料侵蚀磨损性能。采用回归分析的方法建立了预测复合涂层浆液侵蚀磨损的数学模型。这将使重要产品的预测性设计能够使用环保工艺,以最小的浪费和最大限度地利用可持续材料。
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引用次数: 7
Mathematical Model and optimization for Tensile strength of Human Hair Reinforced Polyester Composites 人发增强聚酯复合材料拉伸强度的数学模型及优化
Q3 Engineering Pub Date : 2019-08-14 DOI: 10.1504/IJCMSSE.2019.10017418
P. Rao, C. Kiran, K. E. Prasad
Polymeric-based composites were prepared using chopped fibres of human hair in different volume fractions varying from 5% to 25% by weight and in different fibre lengths ranging from 10 mm to 50 mm. Experiments are conducted to know the tensile strength of the composites. Two-factor - five-level historical data model (DOE) is chosen. In the present study, a mathematical model was developed from the experimental results using response surface methodology (RSM) so as to obtain the optimum tensile strength condition for the composite. The correlation coefficient of the regression model was tested by analysis of variance (ANOVA) to check the adequacy of the mathematical model.
聚合物基复合材料是用人发短纤维制成的,其体积分数从重量的5%到25%不等,纤维长度从10毫米到50毫米不等。通过实验了解了复合材料的抗拉强度。采用双因素五层历史数据模型(DOE)。在本研究中,利用响应面法(RSM)从实验结果中建立数学模型,以获得复合材料的最佳抗拉强度条件。采用方差分析(ANOVA)检验回归模型的相关系数,以检验数学模型的充分性。
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引用次数: 0
Latest developments in virtual casting of lightweight metals 轻金属虚拟铸造的最新进展
Q3 Engineering Pub Date : 2019-08-14 DOI: 10.1504/IJCMSSE.2019.10023222
Qigui Wang, P. Jones, Yucong Wang, D. Gerard
The increasing use of lightweight metal castings in critical automotive and aerospace structures has required improved quality, with more reliable and quantifiable performance. Metal casting processing is very complex and often involves many competing mechanisms, multi-physics phenomena, and potentially large uncertainties. The most effective way to optimise the processes and achieve the desirable mechanical properties is through the development and exploitation of robust and accurate computational models. This paper reviews the latest advances in computational tools for lightweight shape casting processing and discusses the opportunities and challenges for future development of virtual casting.
在关键的汽车和航空航天结构中,越来越多地使用轻质金属铸件,要求提高质量,提高可靠性和可量化的性能。金属铸造工艺非常复杂,经常涉及许多相互竞争的机制、多种物理现象和潜在的巨大不确定性。优化工艺和实现理想机械性能的最有效方法是开发和利用稳健准确的计算模型。本文综述了用于轻量化形状铸造加工的计算工具的最新进展,并讨论了虚拟铸造未来发展的机遇和挑战。
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引用次数: 0
Effect of Ni content and brazing temperature on the self-joining of ZrB2-SiC Ni含量和钎焊温度对ZrB2-SiC自连接的影响
Q3 Engineering Pub Date : 2019-08-14 DOI: 10.1504/IJCMSSE.2019.10023226
Liu Jiayin, Jie Zhang, Chunfeng Liu, Tianpeng Wang
Pd-Co-Ni filler alloy was adopted to braze ZrB2-SiC to itself. The reliable ZrB2-SiC joints were obtained. The effects of Ni content and brazing temperature were investigated on the microstructure and properties of the ZrB2-SiC joints using SEM and four-point bending method. All the joints consist of diffusion zone in ZrB2-SiC ceramic, Pd-Si phase, Co-Si phase, and Ni-Co solid solution. During the brazing, Ni and Co can solute into each other, a certain control over the reaction between SiC from the ceramic and Co from the brazing alloy was obtained, which was beneficial for the joint strength.
采用Pd-Co-Ni填充合金钎焊ZrB2-SiC。获得了可靠的ZrB2-SiC接头。采用扫描电镜和四点弯曲法研究了Ni含量和钎焊温度对ZrB2-SiC接头组织和性能的影响。所有接头均由ZrB2-SiC陶瓷扩散区、Pd-Si相、Co-Si相和Ni-Co固溶体组成。在钎焊过程中,Ni和Co可以相互溶入,对陶瓷中的SiC与钎焊合金中的Co的反应有一定的控制,有利于提高接头强度。
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引用次数: 0
Deformation control study on H-beam welded by a finite element model h型钢焊接变形控制的有限元模型研究
Q3 Engineering Pub Date : 2019-01-01 DOI: 10.1504/IJCMSSE.2019.10023223
XiaojieĀ Wang, Z. Qu, Liqian Xia, Zhongqu Sun
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引用次数: 0
期刊
International Journal of Computational Materials Science and Surface Engineering
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