Article
Nanoscience & Nanotechnology
Aditya Pandey, Sumit Choudhary, Vidit Gaur
Summary: A computational framework was developed to predict the microstructure and morphology within the molten pool. The transition from curved cellular to columnar morphologies was observed while moving from the pool edge to its tail. The framework successfully predicted microstructural features and was validated with experimental observations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Aditya Pandey, Vidit Gaur
Summary: This research studied the effect of inter-layer dwell time and fabrication path strategy on the fatigue properties of wire-arc additively manufactured (WAAM) IN718 alloy. The results showed that the bidirectional fabrication strategy improved mechanical properties compared to the uni-directional strategy. Increasing the dwell time improved the quality of the fabricated part and also improved mechanical properties. Fatigue lives were higher at higher dwell times due to fewer porosities. The observed effects were attributed to reduced heat accumulation, porosities, and residual stresses at higher dwell times.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
G. Mantegna, C. R. Vindigni, S. Valvano, A. Esposito, D. Tumino, A. Alaimo, C. Orlando
Summary: This paper investigates the influence of micro-voids on the stress-strain behavior of AlSi10Mg material using the Representative Volume Element approach and Finite Element Analysis. The study also includes the development of a model and code for analyzing the random pore distribution.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Polymer Science
Fabian Ferrano, Tizian Wachter, Miranda Fateri, Michael Schmiedt
Summary: The influence of extrusion infill angles on the mechanical properties of 3D printed test specimens were investigated in this study. Different polylactide (PLA) specimens with varying infill angles were manufactured and tested using Computed Tomography (CT) scanning and optical measuring system. The results showed significant deviation between the real geometry behavior and the model. Finite Element Method (FEM) simulations were also conducted, which predicted an increase in stiffness, ultimate tensile strength, and strain at failure due to geometric deviation. The goal of this work is to evaluate the stiffness and strength of FFF-printed components using FEM with a justifiable testing effort, considering the directional dependence and suitable strength criterion.
Article
Construction & Building Technology
Hussain Gharehbaghi, Amin Farrokhabadi
Summary: In this paper, the energy absorption capability of a novel cruciform composite lattice structure was evaluated using compression tests and finite element analysis to obtain the optimal configuration in terms of absorbed energy. The studied structure showed excellent energy absorption properties and can be used as an energy absorber in crashworthiness applications.
STEEL AND COMPOSITE STRUCTURES
(2023)
Article
Engineering, Manufacturing
Sang-Woo Han, Hojin Yoo, Seungcheol Shin, Hansol Kim, Geonho Lee, Jongho Jeon, Sangjun Han, Jungho Cho
Summary: In this study, wire arc additive manufacturing (WAAM) using general pulsed gas metal arc welding (GMAW) machine was experimentally investigated to optimize process parameters. The optimized conditions were determined to be 140A welding current, 34V welding voltage, 40 cm/min welding speed, and 15 mm contact tip to work distance (CTWD). The heat input was affected by welding current and voltage, while the surface state and arc stability were influenced by welding speed and CTWD. By adjusting these parameters within the optimized range, a curved propeller blade shape was successfully manufactured.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2023)
Article
Construction & Building Technology
A. Aramburu, I. Calderon-Uriszar-Aldaca, I. Puente
Summary: 3D concrete printing is an important technology for manufacturing lightweight components and complex freeform shells. However, there are still challenges to be addressed for its full development, such as the insertion of reinforcing elements, fabrication of large structures, and insertion of joints between different segments. This study presents a new method with a novel parametric model to simulate the performance of reinforced segmented beams in 3-point bending tests. The method considers not only the geometry and materials of the beam, but also the material age and interface between segments and rebar-concrete adhesion. A set of programmed routines connects commercial design and finite element calculation programs, providing estimated performance of components in 3-point flexural tests.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Polymer Science
Patrich Ferretti, Gian Maria Santi, Christian Leon-Cardenas, Elena Fusari, Giampiero Donnici, Leonardo Frizziero
Summary: Additive manufacturing processes have evolved considerably in the past years, with FDM technique proving to be an economically feasible process. However, current advances in FEM and CAE technology are unable to study 3D printed models accurately, emphasizing the need for in-depth understanding of the printed geometrical mesostructure for further analysis. The study aims to generate a homogeneous structural element that represents the behavior of FDM-processed materials, enabling industries to perform engineering analysis of printed elements efficiently.
Article
Chemistry, Physical
Kadir Gunaydin, Halit Sueleyman Tuerkmen, Alessandro Airoldi, Marco Grasso, Giuseppe Sala, Antonio Mattia Grande
Summary: In this study, the cyclic compression and crush behavior of chiral auxetic lattice structures produced from titanium alloy using electron beam melting additive manufacturing technology were investigated. The research found that the constitutive equation of as-built parts could be accurately extracted considering the build orientation and surface roughness profile. Furthermore, the cyclic compressive and crush behavior of chiral units were examined, identifying regions prone to premature failure and investigating deformation modes to enhance energy absorption abilities.
Article
Engineering, Manufacturing
Ticho Ooms, Gieljan Vantyghem, Ruben Van Coile, Wouter De Corte
Summary: This paper proposes a numerical model for simulating the structural behaviour of 3D printed fresh concrete, with the development of a tool that enables automation of the pre-processing step for numerical analysis and simulation of object behaviour during printing.
ADDITIVE MANUFACTURING
(2021)
Article
Engineering, Industrial
Jingwei Zhang, Yuji Sato, Jun Yanagimoto
Summary: The integration of topology optimization with lattice structures shows great potential for additive manufacturing of lightweight structures. The proposed homogenization-based topology optimization method significantly improves stiffness and energy absorption capability compared to conventional models.
CIRP ANNALS-MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jonas Biggemann, David Kollner, Jonas Schatz, Martin Stumpf, Tobias Fey
Summary: Complex cellular ceramic structures are studied using mu CT analysis to determine the influence of scan resolution on mechanical FEM simulation results. It is found that the highest scanning resolution is needed to achieve good agreement with experimental data, allowing for a reduction of the VOI while still obtaining identical results.
Article
Engineering, Aerospace
Ahmed Malim, Nikolaos Mourousias, Benoit G. Marinus, Tim De Troyer
Summary: This paper presents an original approach to the structural design and analysis of a 3D-printed thermoplastic-core propeller blade for high-altitude UAVs. The approach uses a macroscale linear isotropic numerical model fed with values from testing on standard specimens. The methodology is validated through experiments and is proven feasible for designing and analyzing full-scale propeller blades for high-altitude platforms.
Article
Engineering, Industrial
Shekhar Srivastava, Rajiv Kumar Garg, Anish Sachdeva, Vishal S. Sharma
Summary: This study investigates a novel multi-tier heat input strategy for Gas Metal Arc-based Wire-Arc Additive Manufacturing (GMA-WAAM) fabricated long-scale thin-walled components. The study uses Finite Element Modelling (FEM) to analyze the transient thermal and residual stress distributions of a twelve-layered long-scale thin-walled component with different layer-wise heat inputs. Validation experiments were performed to confirm the accuracy of the predicted results. The study concludes that reducing the heat input during successive layer deposition significantly affects the cumulative heat input into the system. The two-tier heat input system is found to be the most suitable thermal management system, while the four-tier heat input system reduces longitudinal and transverse stresses in the component.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Miroslav Urbanek, Josef Hodek, Daniel Melzer, Martina Koukolikova, Antonin Prantl, Jaroslav Vavrik, Michal Brazda, Petr Martinek, Sylwia Rzepa, Jan Dzugan
Summary: Additive manufacturing (AM) is increasingly becoming a standard process in various industries. However, there is still limited knowledge about the relationship between measured material data and the overall behavior of directed energy deposition (DED) processed complex structures. Understanding the structural performance of additively manufactured parts by DED, including flow curves and local damage properties, is crucial. This study focuses on predicting the behavior of thin-walled structures manufactured by the DED process under static loading using finite element analysis (FEA), and compares the mechanical performance of partly and fully machined miniaturized samples produced from the structure.
Article
Green & Sustainable Science & Technology
A. E. Atabani, Eyas Mahmoud, Muhammed Aslam, Salman Raza Naqvi, Dagmar Juchelkova, Shashi Kant Bhatia, Irfan Anjum Badruddin, T. M. Yunus Khan, Anh Tuan Hoang, Petr Palacky
Summary: The global market for fuel pellets is growing due to coal substitutes, but sustainability and biomass availability are major issues. Spent coffee grounds can be used to produce high heating value fuel pellets, but burning 100% SCG leads to high NO R emissions and low boiler efficiency. Mixing SCG with other biomass improves combustion performance. Further research is needed on the combustion and emissions of defatted spent coffee grounds.
ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY
(2023)
Article
Engineering, Mechanical
S. M. Ibrahim, S. A. Shehzad, F. Mabood, I. A. Badruddin, T. Ambreen
Summary: This study investigates the steady-state, incompressible flow and energy transportation of water-based copper oxide nanofluid past a linear stretching sheet through suction/injection. The effects of magnetohydrodynamics, radiation, and entropy generation are considered. Nonlinear equations are transformed into single independent variable equations using appropriate similarity transformations. Numerical computations are carried out using the Fehlberg scheme. The study examines the impact of influential constraints on dimensionless physical quantities and reports detailed findings. Key observations include higher velocity and weaker temperature with increasing stretching constraint values, reduced irreversibility ratio with emerging stretching strength constraint, decaying Bejan number with higher magnetic constraint, and opposite impacts of blowing and suction on skin-friction factors.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Mathematics
Ali Najem Alkawaz, Jeevan Kanesan, Anis Salwa Mohd Khairuddin, Irfan Anjum Badruddin, Sarfaraz Kamangar, Mohamed Hussien, Maughal Ahmed Ali Baig, N. Ameer Ahammad
Summary: This work proposes an improved method of training neural networks based on optimal control theory. By adapting the learning rate, the proposed algorithm overcomes the local minima problem of backpropagation and achieves better accuracy and shorter training time compared to the conventional method. The effectiveness of the algorithm is verified on various logic gate models and a full adder model.
Correction
Materials Science, Multidisciplinary
Venkatesh Chenrayan, Chandru Manivannan, Selladurai Velappan, Kiran Shahapurkar, Manzoore Elahi M. Soudagar, T. M. Yunus Khan, Ashraf Elfasakhany, Ravinder Kumar, Catalin I. Pruncu
DIAMOND AND RELATED MATERIALS
(2023)
Review
Energy & Fuels
Atul Bhattad, Vinay Atgur, Boggarapu Nageswar Rao, N. R. Banapurmath, T. M. Yunus Khan, Chandramouli Vadlamudi, Sanjay Krishnappa, A. M. Sajjan, R. Prasanna Shankara, N. H. Ayachit
Summary: Nano fluids, including hybrid nano-coolants, are extensively used in energy-related applications such as coolants, refrigerants, and fuel additives. This review article focuses on the hydrothermal behavior of heat exchangers (radiators for engine applications) with mono/hybrid nanofluids. It discusses the preparation and properties of hybrid nanofluids, innovative methodologies for higher heat transfer rates, and applications in engine radiators and fuel additives.
Article
Construction & Building Technology
A. K. Roopa, A. M. Hunashyal, Arun Y. Patil, Abhishek Kamadollishettar, Bharatkumar Patil, Manzoore Elahi M. Soudagar, Kiran Shahapurkar, T. M. Yunus Khan, M. A. Kalam
Summary: There is a growing demand for cement nanocomposites in the 21st century due to their composition, strength, efficiency, and multiscale nature. The inclusion of carbon nanotubes in small quantities to the concrete mix can enhance the material's properties. Molecular dynamics simulations and continuum mechanics modeling are used to understand the behavior and properties of these composites.
ADVANCES IN CIVIL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
H. R. Mohankumar, Maha Gundappa M. Benal, G. S. Pradeepkumar, Vijay Tambrallimath, Keshavamurthy Ramaiah, T. M. Yunus Khan, Javed Khan Bhutto, Mohammed Azam Ali
Summary: This study investigates the impact and flexural strength of SGF-ABS polymer composites by adding 15wt % and 30wt % SGF to ABS. The results show that the addition of SGF significantly improves the impact and flexural properties of ABS, providing a new direction for the study of reinforcement materials.
Review
Energy & Fuels
M. M. Hasan, Shakhawat Hossain, M. Mofijur, Zobaidul Kabir, Irfan Anjum Badruddin, T. M. Yunus Khan, Esam Jassim
Summary: This review provides a comprehensive evaluation of an integrated solar energy system, including photovoltaic technologies, solar thermal systems, and energy storage solutions. It emphasizes the importance of solar energy as a renewable resource and its role in addressing global energy demand and mitigating climate change.
Article
Green & Sustainable Science & Technology
Mallesh B. Sanjeevannavar, Nagaraj R. Banapurmath, V. Dananjaya Kumar, Ashok M. Sajjan, Irfan Anjum Badruddin, Chandramouli Vadlamudi, Sanjay Krishnappa, Sarfaraz Kamangar, Rahmath Ulla Baig, T. M. Yunus Khan
Summary: This study investigates the effects of different biodiesel blends with hydrogen peroxide additive on the performance and emissions of an internal combustion engine. The results show that certain biodiesel blends achieve higher brake thermal efficiencies and the blend D60JB30A10 exhibits the lowest emissions levels. Additionally, the study explores the possibility of using machine learning techniques to predict engine performance and emissions.
Article
Green & Sustainable Science & Technology
Sreekanth Manavalla, M. Feroskhan, Joseph Daniel, Sivakumar Ramasamy, T. M. Yunus Khan, Rahmath Ulla Baig, Naif Almakayeel, Bhanu Kiran Voddin Tirumalapur
Summary: This paper presents the system design of a coal-fired 100 MWe double reheat s-CO(2) power plant, which is optimized for efficiency with turbine inlet pressures and the recompression ratio as variables. The study analyzes the performance and energy losses of the plant at full load and part loads, and identifies the main causes of exergy destruction.
Review
Chemistry, Multidisciplinary
Rajadurai Murugesan, Srikanth Holalu Venkataramana, Siva Marimuthu, Praveena Bindiganavile Anand, Santhosh Nagaraja, J. Samson Isaac, R. Raja Sudharsan, T. M. Yunus Khan, Naif Almakayeel, Saiful Islam, Abdul Razak
Summary: This Review provides a comprehensive overview of research endeavors and achievements in the advancement of magnesium alloys, with a focus on aerospace, automotive, and biomedical applications. The pivotal role played by alloying constituents and PEO coatings in influencing microstructural attributes, mechanical potency, and resistance to corrosion is emphasized.
Article
Chemistry, Multidisciplinary
Navin Kumar, Shatrughan Soren, Akhileshwar Nirala, Naif Almakayeel, T. M. Yunus Khan, Mohammad Amir Khan
Summary: To overcome the limitations of standard ball-mill mixing processes, a unique solution-mixing process was developed to fabricate a uniformly dispersed carbon nanotube (CNT) reinforcement composite without damaging CNTs in matrix powder. The solution-mixing process was found to be simple and effective for achieving uniform distribution of CNTs without structural damage, as compared to the ball-milling process. Various methods, such as HRTEM, XRD, FESEM, Raman spectroscopy, and particle size analysis, were used to examine the structural and thermal properties of the composites.
Article
Chemistry, Multidisciplinary
Lionus Leo George Mary, Subramanian Manivel, Shalini Garg, Vinoth Babu Nagam, Komal Garse, Ranjit Mali, T. M. Yunus Khan, Rahmath Ulla Baig
Summary: This study investigates the influence of incorporating alumina nanoparticles with waste cooking oil biofuels in a gasoline engine. The results show that enhanced biodiesel with Al2O3 nanoparticles can significantly improve thermal efficiency and reduce environmental pollution.
Article
Polymer Science
Bipin S. Chikkatti, Ashok M. Sajjan, Nagaraj R. Banapurmath, Javed Khan Bhutto, Rajesh Verma, T. M. Yunus Khan
Summary: This research presents the development of a novel electrode material, poly(lactic acid)/alloysite nano-clay, for supercapacitors. The material exhibited high specific capacitance and energy density, and showed good electrochemical characteristics in various tests. It also demonstrated excellent capacitance retention after multiple cycles.
Article
Polymer Science
Ramaiah Keshavamurthy, Vijay Tambrallimath, Swetha Patil, Ali A. Rajhi, Alaauldeen A. Duhduh, T. M. Yunus Khan
Summary: The study focuses on the development of polymer composites based on polylactic acid (PLA) fortified with boron nitride (BN), and comprehensively explores their compatibility, synergy, and resulting properties. The findings serve as a foundational resource for enhanced polymer composite development.
