Papers by AMALADAS JOHN RAJAN
Interlaminar tensile properties of raw and carbon fiber‐wrapped additively manufactured polyetherimide
SPE transactions/Polymer engineering and science, Jun 24, 2024
High-performance engineering thermoplastics are important emerging materials, particularly when p... more High-performance engineering thermoplastics are important emerging materials, particularly when processed using additive manufacturing technologies. One of the most important among these is polyetherimide, also known as PEI or ULTEM. Using the fused filament fabrication (FFF) additive
High-performance engineering thermoplastics are important emerging materials, particularly when p... more High-performance engineering thermoplastics are important emerging materials, particularly when processed using additive manufacturing technologies. One of the most important among these is polyetherimide, also known as PEI or ULTEM. Using the fused filament fabrication (FFF) additive manufacturing (AM) process to form this material is a good option, but it is difficult to control the properties in some cases due to the very high processing temperature compared with most engineering thermoplastics. One way to "even-out" the properties is to wrap the specimens in continuous glass or carbon fibers embedded in a thermosetting matrix, as this allows strategic placement and orientation of reinforcement. This also complements the natural structure of the FFF-manufactured materials, helping to minimize the amount of additional weight that needs to be added to a part. To further knowledge in this area, the present study explored and compared the interlaminar tensile strength of FFF-processed PEI/ULTEM 9085 specimens and compared them with ones wrapped in carbon fibers with a 2-part resin matrix. Experiments were performed in accordance with the guidelines given in the ASTM D6415 standard and replicated five times. Variations were introduced in thickness of the specimen and raster angle during the manufacturing process to identify the significant impact of the failure. The results show a fall in interlaminar tensile strength with increasing specimen thickness and a very large effect from natural printing defects in the samples. The carbon fiber wrap decreased the ILTS but made the results far more consistent between experimental runs. This study provides a good, replicated dataset on the performance of raw and fiber-wrapped FFF-processed ULTEM 9085 and gives insights into the structural behavior of the material that will be useful for use in design decisions and material selection.
POLYMER ENGINEERING AND SCIENCE, 2024
High-performance engineering thermoplastics are important emerging materials, particularly when p... more High-performance engineering thermoplastics are important emerging materials, particularly when processed using additive manufacturing technologies. One of the most important among these is polyetherimide, also known as PEI or ULTEM. Using the fused filament fabrication (FFF) additive
Journal of Engineering and Applied Science
Although the wear performance of nylon-6/Boron Nitride (PA6/BN) composites has been studied, thei... more Although the wear performance of nylon-6/Boron Nitride (PA6/BN) composites has been studied, their concurrent optimization and prioritization are scarce in the literature. Considering this shortcoming, this paper proposes a Taguchi-Pareto-based framework incorporating a discrimination signal-to-noise ratio analysis, to enhance the wear performance of PA6/BN composites. Besides the direct factors that consider the weight percentage of particulate additives to nylon 6, sliding distance, sliding speed and normal load, the combinations of direct factors and aspect ratios of the factors were considered in eighteen cases where all four factors are considered in rotation. The novel contribution of the developed Taguchi-Pareto-oriented direct and aspect ratio (TPDA) framework based on its stepwise application to wear performance analysis is noted as follows: (1) establishment of the principal factors by contemplating their importance together with their impact levels on wear performance and...
In this current data-driven world, corporate and industries need decisions driven by data for sta... more In this current data-driven world, corporate and industries need decisions driven by data for staying ahead of the competition and to satisfy the customers. To calculate the results using algorithms that could learn from the fluctuations and abnormalities has been sought after by tech companies as we are now started moving towards industry 4.0. At this time of advent, Machine Learning and Data Science are going to play a major role in shaping the industry and help in its operations. Furthermore, if we look into the industries, many tech and manufacturing conglomerates need suppliers to furnish them with services, materials, and semi-finished products for their operations. Finding the best supplier has been an age-old problem and several solutions have been introduced over the period. In this paper, we will look at how this age-old problem could be solved using modern techniques.
Mathematical Problems in Engineering
Additive manufacturing (AM) or 3D printing has been playing a very important role in the manufact... more Additive manufacturing (AM) or 3D printing has been playing a very important role in the manufacturing sector in recent decades. The AM basic process is meant to produce an object layer by layer and has many advantages that include the occurrence of only minimal production waste during production and easy manufacture of even the most geometrically complex materials. However, there are many challenging decision-making situations in the production of AM for its users, for example, the build chamber, material specification, technology types, and application requirements. This includes the choice of the best AM machine (AMM) from many AMM with slightly different features that are identical on the market, especially on a real-time basis. This research explored ways that AMM is to be selected using multi-criteria decision-making (MCDM) on a real-time basis. This includes the use of the MCDM fussy Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) to help select the...
Scientific Programming
3D printing or additive manufacturing (AM) is considered to be the most important technology amon... more 3D printing or additive manufacturing (AM) is considered to be the most important technology among the emerging technologies. 3D printing technology is considered as an alternative to the conventional manufacturer machine traditionally used in the manufacturing sector. 3D printing technology is generally classified into seven types. Each type of 3D printing technology has its separate own uniqueness (i.e., operation, material usage, and no wastage). The price of a manufactured item includes all its costs. The most important of these is to take into account the price of the machine being manufactured and the features of the machine. Moreover, the price of the product produced in AM will depend on all the costs required to produce it. Then, it is possible to reduce the cost of the product by choosing the AMM that has significant features and the right price. Therefore, this paper aims to solve a decision-making problem from the AMM selection by using one of the multicriteria decision-...
Experimental Investigation on Selection of Shielding Gas Gas Mixture for Aisi 304 Base Metal Using Aisi 309 L Solid Wire Electrode in Mig Welding Process
Research India Publications, 2015
In this research work welding of stainless steel (AISI304) is done by MIG process with the aid of... more In this research work welding of stainless steel (AISI304) is done by MIG process with the aid of AISI309L solid wire electrode. 0.8mm diameter wire selected as electrode due of lack of research work on it is the main criterion of this experimental study. This investigation is focusing on finding appropriate shielding gas/ gas mixture for AISI304 since its wide usage in industries. Three different shielding gasses (Viz; Argon, Argon with carbon dioxide, Argon with carbon dioxide and oxygen) are experimentally adopted in this MIG welding process and the welds are done. Care is taken on the quality of the welded joint that does not become impaired by the shielding gas /gas mixture while using in this experiment. After welding the specimens are divided into three groups to undergo tensile test, hardness test and micro structure observations. The experimental results show the effect of the shielding gas on the weld penetration strength etc. Finally the strength of all three weldments produced by using different shielding gases is compared and future required investigations on selection of shielding gas for 0.8mm solid wire is proposed. Keywords: AISI304, AISI309L, MIG process, shielding gas/gas mixture, 0.8mm solid wire electrode.
FME Transactions, 2020
Urban freight sector in India witnesses the exponential usage of cargo bikes since 2011, for reac... more Urban freight sector in India witnesses the exponential usage of cargo bikes since 2011, for reaching its customers. Cargo bikes are used by eretail firms for mobility in traffic dense roads. This research contributes to the sustainable development of e-commerce and it measures the economic, environmental and social efficiency of cargo bikes in e-retail firms using survey method. It also estimates the optimum volume of cargo bikes on city roads for effective and timely delivery. Data collected by video graphic study is analysed by a traffic simulation tool 'PTV Vissim'. Simulation results are validated with the real data. The findings of this research helpto replace mini trucks with cargo bikes, which in turn minimizes the delivery time, carbon emission, and driver discomfort. The major implications of this research are: e-retail firms have to motivate its customers to prefer prepaid orders and delivering the goods at non-peak time to achieve sustainability.
International Journal of Mechanical and Production Engineering Research and Development, 2018
This research article investigated metallurgical and weldability properties of AISI 316L and AISI... more This research article investigated metallurgical and weldability properties of AISI 316L and AISI 430 stainless steel weld-joints obtained by pulsing current gas tungsten arc welding (PCGTAW) process by employing ERNiCr-3 and ER2209 filler wires. Microstructural investigations witnessed the migrated grain boundaries at the weld zone of ERNiCr-3 and coarsened grains were very minimal at ER2209 weldments. This study is highly in demand in paper and pulp industries and successfully addressed the choice of fillers and detailed study has been carried out to analyze the structure-property relationships of these weldments using the combined techniques of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis.
Materials Research Express, 2020
In the present investigation, Magnesium composites have been fabricated with boron carbide (B4C) ... more In the present investigation, Magnesium composites have been fabricated with boron carbide (B4C) as reinforcement by powder metallurgicaltechnique. Two different particle sizes—micro and nano B4C particles with weight percentage of 0%, 5% and 10% has been studied. The green compacts were prepared by cold pressing and then sintering the specimens before being subjected to cold upsetting under triaxial stress state condition in order to study the phenomenon of workability and instantaneous strain hardening index. Powder characterizations are discussed using x-ray Diffraction peaks, Scanning Electron Microscope images and Energy Dispersive Spectrum analysis. Cold upsetting has been preferred to investigate the performance of the composites. The values of formability stress index factor (β σ ), various stress ratio (σ θ /σ eff , σ m /σ eff andσ z /σ m ) parameters and instantaneous strain hardening index (n i ) are observed for increase in % of B4C particles and its sizes. The experimen...
International Journal of Industrial and Systems Engineering, 2018
The problem of balancing a production line has been one of the typical complications in the field... more The problem of balancing a production line has been one of the typical complications in the field of industrial engineering. An unbalanced production line associates with the downfall in productivity. Since productivity is the 'primus motor' of income in any firm, the above problem cannot be over sighted. In this paper a similar problem is being faced by a company which is unable to cope with the increasing demands of their product. The past data of component manufacturing process, resources required and the time taken is collected, when this data is analysed, constraints are observed in the testing machine of the production line. The elimination of bottleneck in this line is needed in order to escalate the productivity. The intended rate of production is achieved through component-oriented line balancing (COLB) approach. In this method the number of workstations is increased and hence bottle neck is removed. The comparison of the data before and after the implementation of component-oriented line balancing shows a simultaneous improvement in the productivity and reduction of labour cost.
Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2019
Gas Tungsten Arc Welding process using ERNiCrMo-3 filler metal. It is commonly used in nuclear in... more Gas Tungsten Arc Welding process using ERNiCrMo-3 filler metal. It is commonly used in nuclear industries where the weldments are usually subjected to hot corrosion. Devendranath Ramkumar et al. (2015) proposed that weldment between Inconel 718 and AISI 430, using Gas Tungsten Arc Welding obtained from ER2553 and ERNiCrMo-4 fillers and that suggested and brought into the base metals for accumulate numerous benefits in terms of metallurgical and mechanical properties for aerospace and nuclear sectors. Devendranath Ramkumar et al. (2015) studied and reported about corrosion behavior of AISI 316L welds was investigated under 3.5% NaCl environment using Pulsed Current Gas Tungsten Arc Welding employed from two different fillers ER2553 and ERNiCr-3. It was fulfilled from the study that ERNiCr-3 exhibited better mechanical and corrosion properties and could be adopted to achieve optimal properties compared to over-alloyed filler.
International Journal of Mechanical and Production Engineering Research and Development, 2019
Research studies on fuel consumption of logistics systems for developing countries is relatively ... more Research studies on fuel consumption of logistics systems for developing countries is relatively less explored in par with developed countries. Day by day, the consumption of fossil fuels is increasing due to dense traffic, heavy cargo loads, evolving of e-retailing services, erratic drivers etc. This research work considers six key factors for analysis, with an intent of reducing fuel consumption of Logistics Service Providers(LSP). The data collected from logistics service providers, located in India through email; and then it is analysed using Taguchi Method, to find the high influencing factor on fuel consumption to the greater levels. The identified six factors are dead weight of vehicle, mileage per litre, percentage of fuel spent in idle time, span of distance covered, payload of vehicle and average time spent in traffic. The results are obtained based on the condition: smaller the better and it is validated by the LSP.
Knowledge management based supplier selection of wind turbine manufacturer supply chain
International Journal of Knowledge Management Studies, 2019
Knowledge management process (KM) is the stepping stone of several industries development and sup... more Knowledge management process (KM) is the stepping stone of several industries development and supply chain management process because 25% of the industries do not have a direct relationship between the organisational learning and material requirements of the particular product. So, in this paper introduces the knowledge management based analytical hierarchy process (AHP) for gathering the effective supply information. Along with the AHP method, ABC analysis process is used to estimate the critical items while selecting the suppliers. The developed system helps to identify the exact suppliers; critical components involved in the supplier selection process also develop the multi-criteria model for selection of the supplier. At the time of supplier selection process, the method uses the gear box concept which utilises the several knowledgeable information such as the cost of the material, quality of the material, delivery process, consistency of the material and stability. The examined knowledge management (KM) process based supplier selection process improves the performance of the supply chain in the wind industry. In this paper, the wind industry material supplier selection process is discussed as a case study.
International Journal on Design and Manufacturing Technologies, 2012
A Study of CO<sub>2</sub> Emission and Indian Wind Industries – Area for Improvement
Advanced Materials Research, 2014
The world is going through a very tough situation in terms of environment pollution. Many of the ... more The world is going through a very tough situation in terms of environment pollution. Many of the activities of human are creating huge pollution in the entire world. The weather and climate have been changing continuously due to a wide range of human factors. This emission of Greenhouse gases increases the atmospheric temperature gradually. This paper provides a critical perspective to the debate on various greenhouse gas emission in the world. This paper consists of three major areas of discussion. First part of the discussion is with Trends in global CO2 emission second part is global CO2 emission by sector. The last part of the discussion is the potential alternate option to reduce this Gas emission and its concerns for growth focus is discussed for further research. Most of the research papers focused about the solution to the reduction of greenhouse gas emission. Furthermore, in this paper I have focused on the review of Indian wind industries model and its major constraints fa...
IOP Conference Series: Materials Science and Engineering, 2017
The objective of this article is to design and build a bio-friendly air-conditioner, by using ads... more The objective of this article is to design and build a bio-friendly air-conditioner, by using adsorption method in the presence of 15% of calcium carbide in water. Aluminum sheet metals are used to form three identical tunnels, to pass the air for processing. Exhaust heat generated from the dairy sterilizing unit process is reutilized, for cooling the environment through this equipment. This equipment is designed, and the analysis is carried out to quantify the COP, SCP, and cooling power. Heat exchangers are designed; its Performance Parameters are quantified and correlated with the conventional designs. It is observed that the new adsorption chiller can produce the coefficient of performance of chiller as 1.068; the Specific cooling power of 10.66 (W/Kg); and the Cooling power of 4.2 KW. This equipment needs 0 to 15 minutes to reach the desired cool breeze (24˚c) from the existing room temperature (29˚c).
Indian Journal of Science and Technology, 2016
Objective: To design a semi-automatic thresher, which can produce seeds without having broken gra... more Objective: To design a semi-automatic thresher, which can produce seeds without having broken grains, un-threshed grains, spilled grains and to reduce the overlapping timespan due to the early arrival of monsoons.Method: The steps involved in the construction of semi-automatic thresher are • Feedback data of the farmers collected from the various surveys and articles. • Designing of the semi-automatic threshing by 3D modelling software. • Material planning and Procurement. • Assembly and installation. • Testing and Validation. Findings: The results obtained from the thresher are plotted in the graphical layout with the equipment type (on X-axis) and the quantity threshed efficiently (on Y-axis). The Semi-automated thresher are selected as an optimum one among the preferred choices, based on the driving parameters such as good efficiency, low accident history, power independent, easy mode of transfer and portable equipment which will facilitate the farmers to reach the delta area easily. Applications/Improvements: • Versatile utility equipment for different grain seeds (maize, cow pea) by small changes in the design. • Collecting tray is pivoted over a revolving cam to discern the chaff.
International Journal of Logistics Systems and Management, 2007
Vendor performance analysis is a significant area of research in supply chain management. Several... more Vendor performance analysis is a significant area of research in supply chain management. Several researchers have addressed the strategic importance of vendor evaluation and the selection process. These studies have mainly emphasised the impact of vendor selection on various functional areas of business, from procurement to delivery of the products to the end customers. The traditional performance measurement methods of vendor selection primarily considered financial measures and manufacturing strategies in the decision-making process. This paper presents a multi-phase decision-making model called VEPCE to evaluate and select a set of vendors for a set of products with respect to product prioritisation and customer expectations. In the first phase, the profitability rank order for the set of products is obtained using profit ratio analysis. Then, customers are prioritised using the Analytic Hierarchy Process (AHP) in the second phase. We employ critical value analysis in the third phase to prioritise the products based on profitability rank order and customer expectations. In the fourth phase, we evaluate the set of vendors for the set of products using AHP. Finally, an assignment model is used to allocate the specified vendor for each product based on priority. A case study is presented to demonstrate the vendor selection using VEPCE.
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Papers by AMALADAS JOHN RAJAN