Article
Engineering, Mechanical
Parul Mishra, Ramkumar Penchaliah
Summary: Under different lubrication regimes, coated samples with texturing demonstrated better frictional performance compared to non-textured coated samples. The maximum friction reduction was observed for textured DLC coated samples under boundary lubrication regime. This behavior was proposed to be a result of the synergistic effect of graphitisation and texturing.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Review
Electrochemistry
R. N. Bathe, G. Padmanabham, S. Thirumalini, R. Vaira Vignesh
Summary: Mechanical losses consume about 40% of the total energy developed by a typical automotive engine, with piston rings contributing significantly to engine frictional losses. Recent advancements in technologies like laser surface texturing have been aimed at improving fuel economy and reducing emissions by enhancing the tribological performance of internal combustion engines.
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING
(2021)
Article
Engineering, Mechanical
V Ezhilmaran, N. J. Vasa, Sivarama Krishnan, L. Vijayaraghavan
Summary: The femtosecond laser-assisted surface texturing of compression piston rings is shown to reduce friction coefficient and minimize wear on the liner surface by creating dimples with different area density.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Chemistry, Physical
Wojciech S. Gora, Jesper V. Carstensen, Krystian L. Wlodarczyk, Mads B. Laursen, Erica B. Hansen, Duncan P. Hand
Summary: This paper presents a laser surface-texturing technique for manufacturing a surface with tailored high static friction coefficient for large marine engines. By combining laser texturing and surface hardening, the surface properties can be adjusted to achieve the desired friction coefficient. The solution has been successfully tested on driveshafts for ships and is planned for adoption in production.
Article
Engineering, Mechanical
Rita Ferreira, Oscar Carvalho, Luis Sobral, Sandra Carvalho, Filipe Silva
Summary: The radial surface coating layer of compression piston rings is used to improve wear resistance in internal combustion engines. However, the friction coefficient of the piston ring-cylinder liner pair at top dead centers negatively affects the engine's tribological performance. This study tested dimples with different texture dimensions and densities in a home-developed tribometer and found that the texture with an aspect ratio of 0.25 and a density area of 15% yielded the best tribological results.
Article
Physics, Multidisciplinary
Raphael Paul, Abdellah Khodja, Andreas Fischer, Robin Masser, Karl Heinz Hoffmann
Summary: This study focuses on optimizing the piston motion of an alpha-Stirling engine to improve its performance in the presence of mechanical friction. By using a low-effort endoreversible Stirling engine model and an indirect iterative gradient method, the research shows the potential improvements in performance.
Article
Engineering, Mechanical
M. Conradi, A. Kocijan, D. Klobcar, B. Podgornik
Summary: The study found that under different sliding conditions, dimples defined by nanosecond laser exhibited the lowest steady-state coefficient of friction, while in Hank's solution, lines and crosshatching showed better frictional characteristics after running-in and the removal of bulges around the laser textures. In terms of wear resistance, low-density lines pattern and particularly dimples were the most promising in contact situations likely to occur during starved/dry-lubrication conditions.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Automation & Control Systems
Yassmin Seid Ahmed, Jose M. DePaiva, Fred L. Amorim, Ricardo D. Torres, Wagner de Rossi, Stephen C. Veldhuis
Summary: Laser surface texturing improves surface wettability and roughness, while reducing friction coefficient and wear rate on austenitic stainless steel. Among the textures investigated, square textures show the most significant reduction in friction coefficient and wear rate.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Mechanical
M. Alvarez-Vera, Javier A. Ortega, I. A. Ortega-Ramos, H. M. Hdz-Garcia, R. Munoz-Arroyo, J. C. Diaz-Guillen, J. L. Acevedo-Davila, M. A. L. Hernandez-Rodriguez
Summary: This study investigated the microstructure and tribological performance of laser microtextured CoCr alloy discs against UHMWPE, showing that various texturing patterns can reduce friction and wear on UHMWPE pins. The laser surface texturing method improved the nanohardness and reduced friction coefficients, providing insights for enhancing the longevity of MoP joint replacements.
Article
Materials Science, Coatings & Films
Kenneth Adeyemi, Bingtao Sun, Wei Xue, Wenwen Liu, Yu Cao
Summary: Experimental study was conducted on directional friction and wear control by nanosecond pulsed laser selective texturing of grooves on stainless steel and titanium surfaces, showing that optimal groove aspect ratio and orientation angle can reduce friction coefficient and minimize wear for sliding pairs.
SURFACE ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Sorin-Cristian Vladescu, Chiharu Tadokoro, Mayu Miyazaki, Tom Reddyhoff, Takuo Nagamine, Ken Nakano, Shinya Sasaki, Yoshinobu Tsujii
Summary: This study investigates the interactions between concentrated polymer brushes (CPBs) and laser-produced surface texture (LST). The results show that the combination of CPB-LST can reduce the friction coefficient and improve the durability of CPBs through a lateral support mechanism offered by the textured micro-features. The study also reveals the failure mechanisms of CPBs, which are important for the development of CPBs for future applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Xiashuang Li, Guifeng Li, Yuesui Lei, Lei Gao, Lin Zhang, Kangkang Yang
Summary: Laser surface texturing was used to enhance the anti-friction properties of 304 stainless steel. The influence of laser scanning speed, repetition frequency, processing times, laser beam line spacing, and lattice spacing on the friction properties of 304 stainless steel was investigated. The results showed that laser texturing improved the anti-friction properties of 304 stainless steel.
Article
Engineering, Mechanical
Yixu Niu, Xianjuan Pang, Shiwei Yue, Bao Shangguan, Yongzhen Zhang
Summary: The study investigated the main factors influencing the friction and wear properties of steel surfaces under non-conformal contact in starved lubricated conditions, showing that the depth of dimples significantly affects these properties, with the best performance achieved for surfaces textured at a depth of 10 μm, an area density of 10%, and a diameter of 100 μm. Additionally, the friction coefficient exhibited distinct characteristics in different friction and wear stages, delineated as steady-state, variation-state, and dry-friction stages. Surfaces with optimal textured depths effectively prolonged the steady-state and reduced friction and wear during the variation-state, resulting in longer sliding distances in starved lubrication.
Article
Materials Science, Coatings & Films
V. Kashyap, P. Ramkumar
Summary: Superior surface characteristics, including increased roughness and enhanced graphitic characteristics, can be achieved in DLC coated surface for hip implants through laser surface texturing and heat treatment. These techniques improve adhesion strength and deformation resistance by inducing phase formation and bonding behavior at the coating interlayer. The combination of surface texturing and DLC coating also results in lowest friction, making it beneficial for long term hip implant applications.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Faze Chen, Wenchao Liu, Dawei Zhang
Summary: In this study, a method to improve the hydrophilicity of PTFE surface using femtosecond laser texturing assisted cold plasma modification was proposed. The surface of PTFE was roughened and made hydrophilic through texture treatment and cold plasma modification. The hierarchically rough and hydrophilic PTFE surface allowed for a robust adhesive interface with copper, leading to improved bonding strength.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Mechanical
R. Gholami, Saleh Akbarzadeh, S. Ziaei-Rad, M. M. Khonsari
Summary: The study aims to investigate the impact of nano-particles' weight fraction on the friction coefficient in mixed-lubrication regime through experimental and theoretical analysis. Results demonstrate good agreement between theoretical and experimental findings, with a parametric study conducted to explore additional influencing factors.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Behnam Hajshirmohammadi, Michael M. Khonsari
Summary: An online approach using thermoelectricity was proposed to predict the fatigue life of metallic specimens under cyclic loading. The methodology was validated with experimental results, showing a practical methodology for early prediction of fatigue. The correlation between thermoelastic potential and fatigue life was demonstrated in low-carbon steel 1018 specimens measured via an infrared camera.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Engineering, Mechanical
Arash P. Jirandehi, M. M. Khonsari
Summary: A statistical method is presented for estimating the plastic strain energy per cycle in metals under fatigue. The distribution of plastic strain under cyclic loading follows a two-parameter Weibull probability function and a second probability function is incorporated to account for different crystallographic directions. Results from a thermodynamically based model and a finite element model support the predictions made using the statistical method.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
A. Nourian-Avval, M. M. Khonsari
Summary: This paper proposes a model for predicting fatigue life under multiaxial loading based on dissipated heat during fatigue tests, evaluating fatigue damage by considering different rates of dissipated energy under various multiaxial loadings. The predictive capability of the models is confirmed through comparison with experimental fatigue results.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
M. Mehdizadeh, M. M. Khonsari
Summary: The study presented an experimental and theoretical analysis of low carbon steel 1018 subjected to multiaxial loading, showing that different loading conditions affect fatigue life. The use of thermography for fatigue life prediction was more accurate than hysteresis loops in capturing specimens' fatigue life under multiaxial fatigue loading.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Joonyoung Jang, Michael M. Khonsari
Summary: A new nonlinear fatigue damage accumulation model is developed in this paper, which considers the loading sequence effect and predicts the rate of damage by introducing a loading sequence parameter. The applicability of the proposed model is validated using nine sets of independent experimental measurements of fatigue life under multiple loading sequences, showing that the predictions are in agreement with the measured results and providing a reliable estimation of fatigue life.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Review
Engineering, Mechanical
Arash P. Jirandehi, Michael M. Khonsari
Summary: Recent progress in microstructure-sensitive research has led to insights on estimating fatigue damage and predicting useful life. A computational crystal plasticity approach incorporating statistical representations of material microstructure and a new thermodynamically based framework has been suggested.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Composites
Ali Mahmoudi, Michael M. Khonsari
Summary: A new approach utilizing the concepts of kinetic strength and fracture fatigue entropy can reliably predict the fatigue life of laminated composites by considering the temperature and time dependence through Zhurkov's model.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Engineering, Mechanical
Ali Mahmoudi, M. M. Khonsari
Summary: A new method based on the fracture fatigue entropy (FFE) criterion is proposed to predict the fatigue life of metals. This method utilizes the concept of kinetic strength of solid materials to rapidly predict the cyclic plastic strain energy and temperature evolution. Experimental results for Al 7075-T6, LCS 1018, API 5L X52, and MCS 1045 are compared with theoretical predictions, demonstrating that this model can reliably predict the temperature evolution, plastic strain energy dissipation, and fatigue life of metals.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Arash P. Jirandehi, Ali Haghshenas, M. M. Khonsari
Summary: In this study, fully-reversed bending fatigue and impulse excitation tests were conducted to investigate the behavior of High Carbon Steel (HCS) at different environmental temperatures. It was found that with increasing environmental temperature, the specimens tended to become more brittle, leading to a decrease in fatigue life.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Chemical
Soroosh Salehi, Sahar Ghatrehsamani, Saleh Akbarzadeh, M. M. Khonsari
Summary: This paper presents an experimental procedure and a thermodynamic methodology for evaluating adhesive wear in systems with variable and sequential speeds. The continuum damage mechanics (CDM) is used to estimate the probability of asperities forming wear particles and derive the wear coefficient. The results show that the wear coefficient in descending cases is higher than in ascending velocity experiments. Additionally, Archard's law is not suitable for predicting wear volume in situations with variable speeds.
Article
Physics, Multidisciplinary
Mohammad A. Amooie, K. P. Lijesh, Ali Mahmoudi, Elaheh Azizian-Farsani, Michael M. Khonsari
Summary: The effect of sudden variations in working modes and fatigue behavior of CS 1018 is studied using a general model based on the concept of fracture fatigue entropy (FFE). Fully reversed bending tests are conducted on dog bone specimens with variable frequency tests to simulate fluctuating working conditions. The results show that regardless of frequency changes, FFE remains constant and within a narrow band range, similar to a constant frequency.
Article
Engineering, Mechanical
Mohammad A. Amooie, M. M. Khonsari
Summary: This study investigates the fracture behavior of carbon steel 1018 in low-temperature environments. Fully-reversed bending experimental tests were performed to examine the efficacy of using Fracture Fatigue Entropy (FFE) concept for predicting fatigue life at different environmental temperatures. The results show that lower operating temperatures can improve fatigue life of carbon steel. Additionally, FFE remains nearly constant and can be used for reliable prediction of fatigue life at different environmental temperatures. Illustrative examples are provided to demonstrate the utility of this approach for prediction purposes.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Mechanics
A. Mahmoudi, M. R. Khosravani, M. M. Khonsari, Tamara Reinicke
Summary: This study investigates the accumulated entropy at the crack tip of a semi-circular bending (SCB) specimen to determine the threshold for material fracture and interatomic debonding. The plastic flow at the crack tip is measured using the Digital Image Correlation (DIC) technique and strain maps superposed to SCB specimens. The generated entropy at the crack tip reaches a critical limit, beyond which bond breakage occurs, leading to crack surface propagation.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Ali Mahmoudi, Mohammad A. Amooie, Lijesh Koottaparambil, Michael M. Khonsari
Summary: This study introduces a reliable technique for predicting the remaining useful life of components by measuring the temperature signature when the operating frequency is rapidly changed. The approach is validated through fatigue tests on stainless steel specimens. The method allows for predicting the remaining useful life at different operating frequencies.