Browsing by Author "Duraiselvam, Muthukannan"

Now showing 1 - 7 of 7
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    Acoustic emission based deep learning technique to predict adhesive bond strength of laser processed CFRP composites
    (Belgrade University, 2020-06-24) Sathiyamurthy, Ramkumar; Duraiselvam, Muthukannan; Sevvel, P
    The high degree of inhomogeneity in material and intricacies created by machining of carbon fiber reinforced plastic (CFRP) composites hinder the accurate prediction of residual strength of the adhesive bond joint using analytical models. Recently, artificial intelligence techniques are effectively utilized as an alternative method for predicting the results of complex phenomena. In this paper, attempts were made to predict the bond strength of laser surface treated and adhesively bonded CFRP composite specimens using the artificial neural network (ANN) from the acoustic emission (AE) parameter recorded during the shear test. Twelve adhesively bonded specimens whose surfaces were pre-processed with 3W Nd:YAG laser at different processing parameters. ANN was trained using segregated AE data according to the failure mechanism and the percentage of failure load (5 to 100%). Predicted values were compared with experimental values and the results were analysed for the suitability of ANN with AE in the application. © Faculty of Mechanical Engineering, Belgrade.
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    Investigation of high temperature wear performance on laser processed nodular iron using optimization technique
    (Elsevier B.V., 2019-08-16) Jeyaprakash, N; Yang, Che-Hua; Duraiselvam, Muthukannan; Prabu, G; Tseng, Sheng-Po; Raj Kumar, D
    Nodular cast iron (NCI) are used in nuclear energy and transportation industries. Also, NCI are used in gear boxes, camshaft, crank shaft, rolling mill rolls and machine tool beds. The reliability of the NCI under heavy loading condition is affected through several tribological aspects. In the present study, NCI surface has been melted by using an Ytterbium-doped fiber laser. The wear resistances of the substrate and melted surface have been analyzed by using a tribometer. Sliding speed, load and working temperatures have been considered as input parameters to tribometer. From the optimization trials, the applied load was identified as the most significant parameter followed by sliding speed and ambience temperature. The responses of the optimized tribological parameters attained by GRA was confirmed through experimental and agreed closely to the predicted value. Further, the surface of the substrate and laser melted samples were analyzed. The melted surfaces were free from surface deformities and exhibited a noticeable improvement in the wear resistance compared to the substrate.
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    Microstructure and tribological evolution during laser alloying WC-12%Co and Cr3C2−25%NiCr powders on nodular iron surface
    (Elsevier B.V., 2019-01-30) Jeyaprakash,N; Yang, Che-Hua; Duraiselvam, Muthukannan; Prabu, G
    The laser surface alloying has emerged as an important tool to form wear resistant layer. In this work, the characteristics of laser alloyed WC-12%Co and Cr3C2-25%NiCr powders over nodular cast iron and their effects on microstructure, microhardness and wear resistance properties has been investigated. Results shows that the laser alloyed layers are crack free with a very fine structure, improved homogeneity and good metallurgical bonding with the substrate. Microhardness of the alloyed layer has been remarkably increased from 220 HV0.3 to 1199 HV0.3 and 905 HV0.3. The results shown that the wear resistance of the laser alloyed layer was improved by 97.77% and 89.77% for WC-12%Co and Cr3C2−25%NiCr, respectively, compared to that of the substrate nodular cast iron. The enhancement in wear resistance was due to the combined results of the solution strengthening effect, grain refining and good bonding between the hard phases and the matrix.
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    Multi criteria decision making through TOPSIS and COPRAS on drilling parameters of magnesium AZ91
    (KeAi Communications Co., 2021-06-27) Varatharajulu, M; Duraiselvam, Muthukannan; Kumar, M. Bhuvanesh; Jayaprakash, G; Baskar, N
    Magnesium (Mg) alloys are extensively used in the automotive and aircraft industries due to their prominent properties. The selection of appropriate process parameters is an important decision to be made because of the cost reduction and quality improvement. This decision entails the selection of suitable process parameters concerning various conflicting factors, so it has to be addressed with the Multiple Criteria Decision Making (MCDM) method. Therefore, this work addresses the MCDM problem through the TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) and COPRAS (COmplex PRoportional ASsessment) methods. The assessment carried out in the material Mg AZ91 with the Solid Carbide (SC) drill bit. The dependent parameters like drilling time, burr height, burr thickness, and roughness are considered with the independent parameters like spindle speed and feed rate. Drilling alternatives are ranked using the above said two methods and the results are evaluated. The optimum combination was found on the basis of TOPSIS and COPRAS for simultaneous minimization of all the responses which is found with a spindle speed of 4540 rpm and a feed rate of 0.076 mm/rev. The identical sequencing order was observed in TOPSIS and COPRAS method. The empirical model was developed through Box-Behnken design for each response. Superior empirical model developed for drilling time which is 3.959 times accurate than the conventional equation. The trends of various dependents based on the heterogeneity of various independents are not identical, these complex mechanisms are identified and reported. The optimized results of the Desirability Function Approach are greater accordance with the TOPSIS and COPRAS top rank. The confirmation results are observed with lesser deviation suggesting the selection of the above independent parameters.
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    Synthesis of alloying Al 7075 with molybdenum for functional characterization
    (Blue Eyes Intelligence Engineering and Sciences Publication, 2019-09-30) Haja Maideen, A; Duraiselvam, Muthukannan; Varatharajulu, M
    Alloying was conducted on Al 7075 alloy by reinforcement of the metallic portion of molybdenum (Mo) in po wder blended with dielectric fluid to strengthen wear resistance a nd investigate the lubing features of this woven surface. The present work features alloying of Al 7075 with Mo as a vital material. Mechanical attributes along with powder frustration and layered coating size and shape were investigated by scanning electron microscope (SEM), energy dispersive X-ray analysis (EDXA), optical microscope (OM), surface texture with roughness tester and wear vision using pin on disc device. The effect of Peak current (A), Pulse on time (Pon) and Pulse off time (Poff) on the wear execution of an alloyed discharge, Al 7075 auxiliary materials have also been considered using Response Surface Methodology (RSM). Analysis of Variance (ANOVA) was interpreted to add to the effectiveness of material variables on the performance characteristics. Confirmation tests were performed to compare the predicted values with the experimental values and it was found that the results matched well with the experimental results.
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    Thermal shock resistance and thermal insulation capability of laser-glazed functionally graded lanthanum magnesium hexaluminate/yttria-stabilised zirconia thermal barrier coating
    (MDPI AG, 2021-07-10) Khan, Muhammed Anaz; Anand, Annakodi Vivek; Duraiselvam, Muthukannan; Rao, Koppula Srinivas; Singh, Ramachandra Arvind; Jayalakshmi, Subramanian
    In this work, functionally graded lanthanum magnesium hexaluminate (LaMgAl11 O19 )/yttria-stabilised zirconia (YSZ) thermal barrier coating (FG-TBC), in as-sprayed and laser-glazed conditions, were investigated for their thermal shock resistance and thermal insulation properties. Results were compared with those of a dual-layered coating of LaMgAl11 O19 and YSZ (DC-TBC). Thermal shock tests at 1100◦ C revealed that the as-sprayed FG-TBC had improved thermal stability, i.e., higher cycle lifetime than the as-sprayed DC-TBC due to its gradient architecture, which minimised stress concentration across its thickness. In contrast, DC-TBC spalled at the interface due to the difference in the coefficient of thermal expansion between the LaMgAl11 O19 and YSZ layers. Laser glazing improved cycle lifetimes of both the types of coatings. Microstructural changes, mainly the formation of segmentation cracks in the laser-glazed surfaces, provided strain tolerance during thermal cycles. Infrared rapid heating of the coatings up to 1000◦ C showed that the laser-glazed FG-TBC had better thermal insulation capability, as interlamellar pores entrapped gas and constrained heat transfer across its thickness. From the investigation, it is inferred that (i) FG-TBC has better thermal shock resistance and thermal insulation capability than DC-TBC and (ii) laser glazing can significantly enhance the overall thermal performance of the coatings. Laser-glazed FG-TBC provides the best heat management, and has good potential for applications that require effective heat management, such as in gas turbines. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
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    Tribological Studies on AlCrFeCuCoNi High Entropy Alloy Surface Coated on Ti-6Al-4V Using Plasma Transferred Arc Technique
    (Polska Akademia Nauk, 2022-06-10) Prabu, G; Duraiselvam, Muthukannan
    AlCrFeCuCoNi high entropy particles were alloyed on Ti-6Al-4V surface using Plasma transferred arc (PTA ) process. PTA alloyed surfaces were investigated for their phase formation, microhardness improvement and wear behaviour. The various wear mechanism and their corresponding surface roughness were studied. The results revealed that the dual phase of BCC and FCC microstructure along with some intermetallic compounds were grown in the alloyed region through the PTA technique and good metallurgical bonding of the alloyed region with the base material were achieved. The PTA alloyed region exhibited a hardness of 718 HV0.2 which is 2.2 times higher than the hardness of base material. The PTA alloyed samples showed higher wear resistance due to the solid solution strengthening as the HEA has high entropy of mixing that leads to the reduction of free energy of the alloyed region. It exhibited better interconnection of the coated material and superior metallurgical bonding to the base material. Frictional heat produced during the wear test has promoted the formation of FeO, Cr2O3, CuO, NiO and Al2O3 oxide film on the PTA alloyed sample. These oxide films act as a barrier between two mating surfaces and improve the tribo performance of the PTA alloyed sample. © 2022. The Author(s).