Article
Materials Science, Coatings & Films
Debbie Hwee Leng Seng, Zheng Zhang, Zhi-Qian Zhang, Tzee Luai Meng, Siew Lang Teo, Boon Hee Tan, Qizhong Loi, Jisheng Pan, Te Ba
Summary: The influence of spray angles and particle velocities on cold spray deposition of IN718 powders was investigated. Particle velocity was found to have a greater impact on coating porosity compared to spray angle. The lowest porosity and surface roughness but highest compressive surface residual stress were achieved with a spray angle of 50 degrees and particle velocity of 920 m/s. Changing the spray angle had a greater influence on deposition efficiency.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
A. A. Hemeda, C. Zhang, X. Y. Hu, D. Fukuda, D. Cote, I. M. Nault, A. Nardi, V. K. Champagne, Y. Ma, J. W. Palko
Summary: High-speed cold spraying of micro-particles at temperatures below their melting point is an emerging additive process. The bonding strength and coating quality of metallic cold-spray deposits are greatly influenced by the native oxide layer on the particles and substrate. Increasing particle impact velocity improves particle/substrate bonding, and the particle-based simulation approach can effectively reproduce trends in oxide content effect and mechanisms of oxide breakup.
ADDITIVE MANUFACTURING
(2021)
Article
Physics, Fluids & Plasmas
Hanyi Liu, Jun Zhang, Jia Luo, Dongsheng Wen
Summary: Molecular dynamics simulations were used to investigate the behavior of nanodroplets impacting on superhydrophobic and nanocone-structured surfaces. A model was developed to predict whether the nanodroplets would touch the underlying substrate during impact. The advantages and disadvantages of applying nanocone structures to solid surfaces were revealed by analyzing the restitution coefficient and contact time.
Review
Materials Science, Coatings & Films
Ahmed Fardan, Christopher C. Berndt, Rehan Ahmed
Summary: Cold spray technology offers protective coatings, additive manufacturing, and repair services to various industrial sectors. Numerical modeling is extensively used to study particle impact modeling and predict key parameters, with experimental techniques utilized to measure residual stresses in cold spray deposits.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Thermodynamics
Mohsin Khan, Mohammad Zunaid, Qasim Murtaza
Summary: This study investigates the effect of injector length on impact velocity, particle temperature, and substrate surface temperature. The results show that under pure nitrogen environment, the temperature of particles and substrate is higher, while the particle velocity is maximum with helium. Based on the observations, an injector length of 15 mm is found to be optimal.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Materials Science, Coatings & Films
C. A. Bernard, H. Takana, O. Lame, K. Ogawa, J. -y. Cavaille
Summary: The effect of reducing the cross-section area of the nozzle by 20% at the center of a 240-mm-long nozzle in cold spray process was analyzed using computational fluid dynamics (CFD). It was found that particles with a diameter larger than 30 μm rebound inside the nozzle, leading to their upstream movement and recording higher temperature and lower velocity.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2022)
Article
Chemistry, Physical
Qiang Wang, Peng Han, Wenjuan Niu, Nan Li, Xuan Mao
Summary: Amorphous coatings offer significant improvements in surface properties of Mg alloys, but comprehensive research on microstructure evolution of particle-substrate interface is necessary to achieve excellent performance. Cold spray technique is capable of preparing amorphous coatings and leads to the formation of grain-refined layer and amorphous regions in the substrate.
Article
Materials Science, Multidisciplinary
Y. Nikravesh, G. Frantziskonis, Marat I. Latypov, K. Muralidharan
Summary: In this study, the cold-spray additive manufacturing process of nanometric copper particles impacting a copper substrate is investigated using molecular dynamics simulation. The interplay between particle size, velocity, penetration depth, and impact bonding energy is explored. The results show that smaller particles (<8 nm) can bind to the substrate even at low velocities (~100 m/s), while larger particles (≥8 nm) require a critical velocity (≥200 m/s) for binding. At velocities near and above 500 m/s, material jetting and increased particle penetration are observed for larger particles. Temperature rise, adiabatic shear banding, and instability are observed, especially at the particle-substrate interface, resulting in particle-cratering at higher velocities. Both adiabatic shear banding and jetting are not prerequisites for particle binding. A constitutive relationship governing the particle's kinetic energy, penetration depth, and impact bonding energy is found.
Article
Physics, Fluids & Plasmas
Shahin Mohammad Nejad, Eldhose Iype, Silvia Nedea, Arjan Frijns, David Smeulders
Summary: In this study, the Gaussian mixture (GM) model, an unsupervised machine learning technique, was used to construct a statistical gas-solid surface scattering model based on collisional data obtained from molecular dynamics (MD) simulations. The results showed that the GM model outperformed the traditional scattering kernel model in predicting the distribution of postcollisional velocities and accommodation coefficients.
Article
Materials Science, Coatings & Films
Ahmad Nourian, Tricia Schwartz, Samuel Boese, Sinan Muftu
Summary: The effects of cold spray process parameters on the deposition efficiency and bonding quality of Al-6061 powder were investigated. The study revealed that nozzle orientation, particle impact velocity, and nozzle travel speed affect the deposition and bonding. Microstructural evaluation showed that bonding occurs in peripheral regions of the splats. A critical spray angle was also identified, below which no deposition takes place. A new method for substrate surface preparation was proposed using low angle spraying. The spray angle was found to influence deposition efficiency, porosity, and microstructure.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2022)
Article
Engineering, Environmental
Qian Yi, Xiaoyu Hao, Xinnong Li, Haojie Dong, Lanyi Sun
Summary: This study experimentally and theoretically investigated the effect of TiO2 nanoparticles on the mass transfer process during the removal of toluene by deep eutectic solvent. The concentration and particle size of TiO2 nanoparticles were found to significantly affect the toluene removal performance. Molecular dynamics simulations revealed that TiO2 nanoparticles improve the mass transfer performance of toluene without changing the mechanism of interaction between toluene and deep eutectic solvent.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Manufacturing
Peng Gao, Che Zhang, Rui Wang, Guanyu Deng, Jiaqing Li, Lihong Su
Summary: The tamping effect is crucial for producing high-quality coatings in cold spray, but few studies have been conducted in this direction. A multi-particle impact model was proposed to investigate the tamping effect on the behavior and morphology of Cu particles in cold spray. The tamping effect can induce changes in the flattening ratio and densify the microstructure of the under-layer coating, while obstruction and extrusion of surrounding particles at high impact velocity can affect the overall surface quality of additively manufactured copper coatings and pose a risk to substrate damage.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Raja Azhar Ashraaf Khan, A. M. Alsaad, Afsheen Zulfqar, Muhammad Mateen, Qais M. Al Bataineh, Bader S. Al-Anzi, Hisham S. M. Abd-Rabboh, Ghulam Abbas Ashraf, Ahmad Telfah, Meng-Bo Luo
Summary: The impact of the interaction strength between polymer and nanoparticles on the glass transition temperature and phase separation in polymer nanocomposites was explored using molecular dynamics simulations. The results showed that the glass transition temperature exhibited different behaviors at low and high-volume fractions of nanoparticles, depending on the interaction strength. Phase separation was observed at high volume fractions of nanoparticles with low interaction strength, while no phase separation was observed at high interaction strengths. It is recommended to consider the critical value of the interaction strength to avoid phase separation and instability in polymer nanocomposites with a high volume fraction of nanoparticles.
JOURNAL OF MATERIALS SCIENCE
(2023)
Review
Chemistry, Applied
M. Dharini, S. Jaspi, R. Mahendran
Summary: Cold plasma, generated at room temperature, consists of reactive species that cause chemical and physical changes in biological materials. Its applications in food aim to ensure safety, quality, and property modification. However, our understanding of the mechanisms behind these alterations is limited, with only a few reactive oxygen and nitrogen species being extensively studied. This review explores the use of different feed gases to modify species composition and highlights the importance of considering all reactive species in food modification, along with the potential of molecular dynamics simulation to bridge the knowledge gap.
Article
Chemistry, Physical
Rui Wang, Chuan Lai, Hanmei Huang, Shiyong Wei, Wenjun Xiang, Ting Long, Yanchuan Gong, Xiaotong Zeng, Rongguo Yang
Summary: The interface phenomenon of demulsification over solid particles was investigated by molecular dynamics simulation. It was found that materials like Fe2O3, SiO2, graphene, and graphene oxide exhibit oil-water interface activity. The interfacial activity of metal-organic frameworks (MOFs) was also studied, revealing the differences between MIL-100(Fe) and MIL-53(Al) in terms of oil-molecule adsorption and oil-phase migration. This research provides insights into the demulsification mechanism and the development of insoluble demulsifiers.
SURFACES AND INTERFACES
(2023)
Article
Automation & Control Systems
Sagil James, Abhishek Sonate
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2018)
Article
Automation & Control Systems
Vinit Mistry, Sagil James
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2018)
Article
Automation & Control Systems
Sagil James, Lenny De La Luz
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2019)
Article
Automation & Control Systems
Sagil James, Aakash Patil
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2020)
Article
Engineering, Manufacturing
Sagil James, Sagar Panchal
JOURNAL OF MANUFACTURING PROCESSES
(2019)
Article
Automation & Control Systems
Sagil James, Shayan Mohammad Nejadian
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2020)
Article
Automation & Control Systems
Sagil James, Samir Mulgaonkar
Summary: Three-dimensional bioprinting is a promising field in medical science that has enormous potential for manufacturing operative tissue structures. The quality of bioprinting results depends heavily on printing parameters and the selection of biomaterials that closely match the target structure. This study aims to determine and optimize printing parameters for hybrid bio-inks, with a focus on the composition of hydrogels. The results indicate that parameters such as air pressure, nozzle speed and diameter, and hydrogel composition significantly affect printing quality. The study also provides a systematic framework to assess the properties of amino acids and derivatives, which can be applicable to other areas of 3D bioprinting. The findings of this study are crucial for establishing 3D bioprinting as a comprehensive manufacturing solution for biopharmaceutical industries.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Sagil James, Joel Zarate
Summary: The realm of 3D printing has revolutionized manufacturing and mechanical engineering by enabling the production of complex geometries that would otherwise be costly or impractical. Volumetric 3D printing has emerged as a solution to generate flawless complex geometries. However, the current research faces the challenge of using materials that are affected by the destructive nature of UV light, rendering certain additives useless. This study proposes a novel manufacturing process called visible light-induced-volumetric 3D printing (VLI-V3DP) that successfully identifies a resin that can be cured using visible light, thus allowing for the incorporation of various additives to meet specific requirements.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Sagil James, George Eckert
Summary: Modern CNC machining industries rely on high-technology virtual simulations like Finite Element Analysis (FEA) to improve competitiveness, productivity, and sustainability. However, the traditional offline use of FEA often leads to erroneous results and wastage of resources. This research aims to integrate real-time FEA with CNC machining process using Mixed Reality (MR) to enhance decision-making and improve machining results.
Article
Chemistry, Physical
Sagil James, Mehrshad Mazaheri
Summary: High-speed machining processes are affected by heat accumulation caused by friction, resulting in shorter tool life and lower product quality. The use of cutting fluids can help dissipate heat but conventional usage causes damage to health and the environment. Minimum quantity lubrication (MQL) has been used as an alternative strategy to reduce costs.
Article
Engineering, Mechanical
Urvesh Kabariya, Sagil James
Article
Engineering, Manufacturing
Vivek Anand Menon, Sagil James
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2018)
Article
Engineering, Manufacturing
Shripal Bhaysar, Sagil James
ADDITIVE MANUFACTURING
(2018)
Article
Engineering, Manufacturing
Mayur Parmar, Sagil James
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2018)