Article
Chemistry, Physical
Galina Eremina, Alexey Smolin
Summary: This study used a numerical model to analyze the regenerative effects of shockwave treatment, and the results indicate that the energy flux density of therapeutic shockwave loading should exceed 0.3 mJ/mm(2) to obtain the conditions required for cartilage tissues and meniscus regeneration.
Article
Thermodynamics
Zezhong Yang, Bo Zhang
Summary: This study investigates the ignition modes and detonation propagation induced by shock wave focusing using numerical and experimental methods. The results show that three ignition modes occur with increasing intensity of the incident shock wave. The formation of new hot spots and transverse waves are crucial for the initiation and maintenance of detonation waves.
COMBUSTION AND FLAME
(2023)
Article
Materials Science, Coatings & Films
Wenbo Li, Hongjian Wu, Mohamed Sokore, Rija Nirina Raoelison, Hanlin Liao, Sophie Costil, Sihao Deng
Summary: Cold spraying is a promising additive manufacturing process with diverse applications. The focus of research currently lies in the understanding of deposition mechanisms and coating performance. Kinematic spraying parameters, such as angle, distance, and speed, affect deposit growth. This paper proposes a MATLAB numerical deposition modeling approach for cold spray additive manufacturing to accurately simulate the process and provide practical guidance.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Yue Li, Bingbing Liu, Mingyu Wang, Gang Liu, Quan Dong
Summary: The study found that shock waves have a significant impact on spray development and mixing characteristics, as well as the flow field parameters. Numerical simulations were consistent with experimental data, validating the accuracy of the simulation method.
Article
Materials Science, Coatings & Films
A. Gibas, M. Winnicki, A. Baszczuk, M. Jasiorski
Summary: In this study, low-pressure cold-sprayed suspensions were used to produce coatings containing oxygen-rich titanium dioxide. The titanium dioxide suspension was synthesized using a sol-gel approach and modified with hydrogen peroxide. By controlling the deposition parameters, the chemical structure and morphology of the coatings were adjusted to retain the oxygen-rich TiO2 properties and achieve a high surface specific area.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
H. X. Zhou, S. W. Jiang, X. T. Li, C. X. Li
Summary: In this study, the contact interaction and bonding mechanisms between Ti6Al4V particles and various substrates were investigated by cold spraying. It was found that only the Al substrate deformed upon impact by the Ti6Al4V particle, while both the Ti6Al4V particle and Cu substrate deformed. The interfacial microstructure analysis showed the presence of an oxide layer between the Ti64 particle and Al substrate, preventing adhesion. However, localized metallurgical bonding occurred due to the transformation of the oxide layer into an amorphous phase.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Mechanical
Rocio Cortes, Miguel Angel Garrido-Maneiro, Pedro Poza
Summary: This study focuses on the analysis of wear resistance against micro-scratching in metallic coatings. 316L stainless steel powders were deposited onto low carbon steel S355J2 using cold spray, with variations in the pressure and temperature of the propellant gas. Nanoindentation tests were conducted to determine hardness and elastic modulus, microscratch tests were used to measure wear rates and friction coefficients, and scanning electron microscopy was used to analyze the wear mechanisms by evaluating scratch grooves. The relationship between hardness and wear rate was also determined.
Article
Materials Science, Coatings & Films
Hongjian Wu, Shaowu Liu, Wenbo Li, Marcel Lewke, Rija-Nirina Raoelison, Alexander List, Frank Gaertner, Hanlin Liao, Thomas Klassen, Sihao Deng
Summary: Applications in thermal and kinetic spraying for coating of complex parts are increasing. Current individual adjustment of robot programming for deposition paths is time-consuming. This work addresses novel strategies for robot programming and post-spray analyses, allowing for fast adaptation and quality control. The proposed method was tested on a complex workpiece and proved to enable fast generation of paths and accurate transfer to spray procedures.
SURFACE & COATINGS TECHNOLOGY
(2023)
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
Materials Science, Multidisciplinary
Yi-Fan Xie, Feng Feng, Ying-Jun Li, Zhi-Qiang Hu, Jian-Li Shao, Yong Mei
Summary: The study found that upon release from shock pressures above 14 GPa, initially incomplete densified samples can reach a maximum densification of 2.56 g/cm3 with a decrease in Si-O-Si bond angle and 11% emergence of 5-fold Si atoms. Shock release cannot achieve a maximum densification of 20% in the samples, and HCP or FCC O atoms indicate a tendency towards crystallization of silica glass at shock pressures above 30 GPa. Initial densification appears to promote the transformation to stishovite phase in the material.
MECHANICS OF MATERIALS
(2021)
Article
Materials Science, Coatings & Films
Asghar Heydari Astaraee, Chiara Colombo, Sara Bagherifard
Summary: The surface metallization of polymeric materials using cold spray technology has attracted increasing attention in the past decade, yet there are challenges in achieving continuity and homogeneity of metallic deposits. Modeling and simulation tools could be helpful in assessing the efficiency of different strategies for improved deposition, but efforts to use numerical modeling in this area have been less successful.
JOURNAL OF THERMAL SPRAY TECHNOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Cyrill Slezak, Jonas Flatscher, Paul Slezak
Summary: In recent years, the potential beneficial applications of extracorporeal shock wave therapy (ESWT) to the central nervous system have attracted interest. Through high-resolution tissue-realistic simulations, this study compares the viability of different ESWT applicators for transcranial applications. The results show that current applicator technologies can effectively deliver therapies through the skull barrier, providing insights for improving therapeutic outcomes.
Article
Materials Science, Coatings & Films
Ibrahim Goda, Essole Padayodi, Rija Nirina Raoelison
Summary: This research aims to investigate the interfacial adhesion strength of cold-sprayed copper coatings on copper and PEEK substrates for repair applications. Different damage models are employed to describe ductile damage of bulk materials, and a Cohesive Zone Model (CZM) is developed to model Cu/Cu interface debonding. The Virtual Crack Closure Technique (VCCT) is used to simulate brittle debonding failure of the Cu/PEEK coating. These debonding modeling techniques can be useful for predicting coating behavior and bonding strength in cold spraying under various loading situations and material combinations.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
A. Gibas, A. Baszczuk, M. Jasiorski, A. Lewinska, M. Winnicki
Summary: Efficient large-scale methods for creating photocatalytic coatings active in visible light are still in demand. In this study, oxygen-enriched titanium dioxide was used as the feedstock for low pressure cold spraying. The spraying parameters were adjusted to produce coatings with different properties. The results showed that the temperature of the propellant gas had the most significant effect on the band gap energy and surface area of the coatings. The activity of the oxygen-rich titanium dioxide coatings was demonstrated through methylene blue degradation under visible light.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Sebastien Weiller, Francesco Delloro
Summary: This study aims to understand the mechanisms of pore formation during the build-up of cold spray coatings through numerical simulations. The study reveals that pore formation is mainly caused by two intricate mechanisms: interfacial porosity at particle/particle interfaces and stack porosity due to particle density variations in the gas flow. Additionally, an original method to estimate porosity from multi-particle impact simulations is presented. The study emphasizes the importance of choosing the reference volume for porosity computation accurately.
ADDITIVE MANUFACTURING
(2022)
