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1.
Friction stir welding (FSW), which has several advantages over the conventional welding processes, is a solid-state welding
process where no gross melting of the material being welded takes place. Despite significant advances over the last decade,
the fundamental knowledge of thermomechanical processes during FSW is still not completely understood. To gain physical insight
into the FSW process and the evaluation of the critical parameters, the development of models and simulation techniques is
a necessity. In this article, the available literature on modeling of FSW has been reviewed followed by details of an attempt
to understand the interaction between process parameters from a simulation study, performed using commercially available nonlinear
finite element (FE) code DEFORM. The distributions of temperature, residual stress, strain, and strain rates were analyzed
across various regions of the weld apart from material flow as a means of evaluating process efficiency and the quality of
the weld. The distribution of process parameters is of importance in the prediction of the occurrence of welding defects,
and to locate areas of concern for the metallurgist. The suitability of this modeling tool to simulate the FSW process has
been discussed. The lack of the detailed material constitutive information and other thermal and physical properties at conditions
such as very high strain rates and elevated temperatures seems to be the limiting factor while modeling the FSW process. 相似文献
2.
Kailas Vodrahalli Achintya K. Bhowmik 《Journal of the Society for Information Display》2017,25(11):676-694
Recent advances in the field of computer vision can be attributed to the emergence of deep learning techniques, in particular convolutional neural networks. Neural networks, partially inspired by the brain's visual cortex, enable a computer to “learn” the most important features of the images it is shown in relation to a specific, specified task. Given sufficient data and time, (deep) convolutional neural networks offer more easily designed, more generalizable, and significantly more accurate end‐to‐end systems than is possible with previously employed computer vision techniques. This review paper seeks to provide an overview of deep learning in the field of computer vision with an emphasis on recent progress in tasks involving 3D visual data. Through a backdrop of the mammalian visual processing system, we hope to also provide inspiration for future advances in automated visual processing. 相似文献
3.
S. Jayalakshmi S. V. Kailas S. Seshan K. Kumar T. S. Srivatsan 《Materials and Manufacturing Processes》2005,20(5):747-760
A growing impetus to enhance our understanding of the behavior of magnesium-based alloys for use in weight critical applications resulted as a consequence of the low density of magnesium. In an attempt to enhance the applicability of magnesium for a wide spectrum of performance-critical applications, the addition of reinforcement to the alloy was considered as an economically affordable and potentially viable scientific alternative. In this paper are reported the results of a study aimed at understanding the influence of saffil alumina short fiber reinforcement on microstructural development of a squeeze-cast magnesium alloy. Preliminary results confirm promise of the reinforced alloy, which retains hardness, strength, and stiffness better at elevated temperatures compared to the unreinforced counterpart. However, impact strength and toughness of the reinforced alloy are inferior. The importance of the matrix alloy in governing the overall mechanical response of the composite microstructure is discussed based on fractographic observations. The importance of volume fraction of the reinforcing phase on properties of the composite microstructure is highlighted. 相似文献
4.
Kanti Kumar Athankar Kailas L. Wasewar Mahesh N. Varma Diwakar Z. Shende 《分离科学与技术》2017,52(17):2696-2703
Equilibrium and kinetics studies are required to design the continuous extraction process for the acid-extraction system. In the present study, an attempt has been made to investigate the equilibrium and kinetics parameters for the reactive extraction of phenylacetic acid (PAA) with tri-n-butyl phosphate (TBP) in hexanol. The equilibrium results show that the formation of the (1:1) PAA–TBP complex in the organic phase with an overall equilibrium complexation constant (Ke) was 78.74 and 29.15 m3.kmol?1 for TBP concentrations of 0.734 and 1.464 kmol.m?3, respectively. The mass transfer coefficients (kL) for PAA were found to be in the range of 3.7 × 10–5–6.2 × 10–5 m.s?1. Based on the Hatta number (Ha = 8.48), the reaction was found to be fast chemical reaction (regime 3) with the order of reaction as 0.77 and 0.36 with respect to PAA and TBP, respectively. The rate constant of the reaction was obtained as 0.017 kmol.m?3.s?1. 相似文献
5.
Pradeep L. Menezes Kishore Satish V. Kailas Michael R. Lovell 《Journal of Materials Engineering and Performance》2011,20(8):1438-1446
In the present investigation, soft materials, such as Al-4Mg alloy, high-purity Al and pure Mg pins were slid against hard
steel plates of various surface textures to study the response of materials during sliding. The experiments were conducted
using an inclined pin-on-plate sliding apparatus under both dry and lubricated conditions in an ambient environment. Two kinds
of frictional response, namely steady-state and stick-slip, were observed during sliding. In general, the response was dependent
on material pair, normal load, lubrication, and surface texture of the harder material. More specifically, for the case of
Al-4Mg alloy, the stick-slip response was absent under both dry and lubricated conditions. For Al, stick-slip was observed
only under lubricated conditions. For the case of Mg, the stick-slip response was seen under both dry and lubricated conditions.
Further, it was observed that the amplitude of stick-slip motion primarily depends on the plowing component of friction. The
plowing component of friction was the highest for the surfaces that promoted plane strain conditions and was the lowest for
the surfaces that promoted plane stress conditions near the surface. 相似文献
6.
Ranimol Stephen A. M. Siddique Fouran Singh Lekshmi Kailas Seno Jose Kuruvilla Joseph Sabu Thomas 《应用聚合物科学杂志》2007,105(2):341-351
The effect of microfillers on the thermal stability of natural rubber (NR), carboxylated styrene butadiene rubber (XSBR) latices, and their 70/30 NR/XSBR blend were studied using thermogravimetric method. Microcomposites of XSBR and their blend were found to be thermally more stable than unfilled samples. The activation energy needed for the degradation of polymer chain was calculated from Coats‐Redfern plot. Activation energy needed for the thermal degradation of filled samples was higher than unfilled system. It indicated the improved thermal stability of the filled samples. The ageing resistance of the micro‐filled samples was evaluated from the mechanical properties of aged samples. The thermal ageing was carried out by keeping the samples in hot air oven for 7 days at 70°C. The mechanical properties such as tensile strength, modulus at 300% elongation, and strain at break were computed. As compared to unfilled samples, micron‐sized fillers reinforced systems exhibited higher ageing resistance. Finally, an investigation was made on the influence of ion‐beam irradiation on microcomposites of NR, XSBR latices, and their 70/30 blend systems using 28Si8+ performed at 100 MeV. The surface changes of the samples after irradiation were analyzed using X‐ray photoelectron spectroscopy. The results of XPS measurements revealed that the host elements were redistributed without any change in binding energies of C1s, O1s, and Si2p. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 相似文献
7.
Fretting is essentially a surface phenomenon, but bulk stresses and material properties contribute to subsequent failure.
This feature of fretting demands a thorough understanding of near surface stresses under the joint action of normal, shear and thermal loading. Axisymmetric fretting is of great concern in piping
and coupling design. In this paper, we develop design tools for Near Surface Analysis (NSA) for understanding axisymmetric
fretting. Axisymmetric Fretting Analysis (AFA) becomes formidable owing to localised tractions that call for Fourier transform
techniques. We develop two different NSA strategies based on two-dimensional plane strain models: 2D strip model (2DS) and
half-plane Flamant model (2DF). We compare the results of 2DS and 2DF with the exact results for AFA obtained using Love’s
stress function in conjunction with Fourier transform. There is a good correspondence between stress components obtained from
2D-models. 相似文献
8.
Additively manufactured polymeric products for automotive, aerospace, and biomedical applications are usually intended for service in an outdoor environment with high mechanical loading conditions. The strength and sustainability of the products can be significantly degraded due to the outdoor environmental conditions such as UV light, moisture, heat, and so forth. In this research work, a novel weather-resistant polymer (WRP) material, that is, acrylonitrile styrene acrylate (ASA), has been studied. Furthermore, this work aims to study the effect of process parameters and enhance the strength of WRP (ASA) specimens using the FFF process. The optimized process parameters, that is, build orientation (BO), extrusion temperature (ET), layer thickness (LT), and printing speed (PS), were identified based on the tensile and flexural strength using the Taguchi technique and statistical analysis. The best tensile and flexural strengths for the specimen were achieved at both orientations (XYZ and ZXY) TS: 255°C ET, 0.14 mm LT, 50 mm/s PS; and FS: 245°C ET, 0.28 mm LT, 50 mm/s PS, respectively. Regression model was developed to investigate the correlation between the process parameters with tensile and flexural strength. A validation test confirmed the findings, and the error between the actual and predicted values is less than ±10%. 相似文献
9.
Kailas K. Moravkar Tariq M. Ali Jaywant N. Pawar Purnima D. Amin 《Advanced Powder Technology》2017,28(4):1270-1280
Moisture activated dry granulation (MADG) method was used to develop IR tablets with cohesive, fluffy and high dose drugs. To evaluate this approach, three drugs: metformin hydrochloride, acetaminophen and ferrous ascorbate were selected as model compound along with three binders: maltodextrin DE16, PVP K 12 and HPC. The granules were generated using MADG method and tablets were prepared using rotary tablet press. The granules and tablets were characterized for particle size analysis, flow properties, tablet hardness, friability, moisture content, dissolution study, disintegration time and stability study. All results were found to be within acceptable limits. Development of all formulation tablets were found as best fitted for an immediate release of Metformin hydrochloride, acetaminophen and ferrous ascorbate. MADG delivered a robust manufacturing process for generation of granules with excellent flowability. The tablets prepared using this method were found to show better content uniformity, good compactability and low friability. Use of this approach aids to lower the amount of excipients used to overcome physiochemical limitation of the drug substances and there side effects. Both drying and milling steps in wet granulation were not required for MADG process. MADG became a cost effective process which could lead to reduced total tablet size and also save time. 相似文献
10.
Properties of squeeze cast Mg-6Zn-3Cu alloy and its saffil alumina short fibre reinforced composites
S. Jayalakshmi Satish V. Kailas S. Seshan E. Fleury 《Journal of Materials Science》2006,41(12):3743-3752
In the present work, Mg-Zn-Cu alloy (ZC63) and its saffil alumina short fibre reinforced composites produced using the squeeze
casting technique were evaluated for their properties. The unreinforced base alloys and their composites were characterized
for their microstructure, hardness, yield strength, impact strength, wear resistance and corrosion resistance. The dependence
of the properties of composites was studied as a function of fibre volume fraction. Results showed that the composites exhibited
improved hardness, yield strength at elevated temperature and wear resistance in comparison to the monolithic alloy. However,
ductility, impact strength and corrosion resistance of the composites were inferior to that of the base alloy. The nature
of the base alloy matrix in determining the properties of the composites was discussed based on fractographic analysis. 相似文献