Article
Engineering, Mechanical
Jian Chen, Di Liu, Chenglong Wang, Wangyang Zhang, Linbo Zhu
Summary: A fractal contact model was proposed to study the dynamic contact performance of engineering surfaces, considering the scale-dependence of critical contact parameters. The study found that the scale of asperities in the lowest ten grades significantly affects the contact characteristics of the entire joint surface. Changes in topography and material properties can influence the contact characteristics.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Chemistry, Analytical
Shengguang Zhu, Liyong Ni
Summary: A novel static friction model for the unlubricated contact of random rough surfaces at micro/nano scale is proposed based on energy dissipation mechanism and statistical theory, providing a new way to calculate friction between rough surfaces in contact.
Article
Chemistry, Physical
Hui-Ping Lin, Li-Jen Chen
Summary: The study demonstrates that a surface with certain roughness on single micro-scale structures can exhibit petal effect, where water drops can be pinned by infiltrating into spaces between micro-pillars. Experimental observations reveal the evolution of wetting behavior of water droplets on surfaces with varying roughness, including the Cassie-Wenzel transition during ACA measurement.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Engineering, Mechanical
Ming Chen, Qiang Bian, Guang Zeng, Chunjiang Zhao, Lianyun Jiang, Xiangyun Zhang, Bowen Jiao
Summary: Based on the micro-contact model of spherical roller bearings established through reverse engineering, this study investigates the contact characteristics of different roughness surfaces. The results indicate that surfaces with smaller roughness exhibit better contact performance and fatigue life. This provides valuable references for selecting the appropriate machining accuracy of the contact surfaces.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Mechanics
Sihe Wang, Weike Yuan, Xuanming Liang, Gangfeng Wang
Summary: This paper presents an analytical contact model for elastic or elastic-perfectly plastic Gaussian rough surfaces and validates it with finite element simulations. The model accurately predicts the contact behavior, showing good agreement with the simulation results. Additionally, the influence of plastic deformation on the contact response is characterized by introducing a dimensionless plasticity parameter.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Engineering, Mechanical
Xin Yu, Yunyun Sun, Deng Zhao, Shijing Wu
Summary: A model of normal stiffness between curved fractal surfaces considering friction factor is proposed, determining deformation modes of all asperities and deriving contact stiffness of the whole rough surface. Results show that contact stiffness depends sensitively on the fractal dimension and exhibits nonmonotonic characteristics as fractal roughness varies across scales. Predicted values of normal stiffness are compared with existing contact models and experimental data for validation.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Multidisciplinary
Gengxiang Wang, Liang Wang, Yuan Yuan
Summary: This investigation validates the effect of rough contact surface on the dynamic responses of multibody systems based on fractal theory. A new contact force model is proposed and validated through simulations and experimental data, demonstrating its accuracy and generality.
APPLIED MATHEMATICAL MODELLING
(2022)
Review
Chemistry, Analytical
Siyuan Zhang, Dawei Li, Yanwei Liu
Summary: Contact and friction are closely related and widely used in mechanical engineering and traffic. The behavior of contact and friction on rough surfaces is complex, with many unresolved issues.
Article
Engineering, Chemical
Jamal Choudhry, Andreas Almqvist, Roland Larsson
Summary: A multi-scale flash temperature model has been developed and validated, showing its adaptability in predicting flash contact temperatures in various sliding systems. The study investigated the impact of different surface roughness parameters on flash temperatures, revealing that changes in these parameters can affect the maximum flash temperature without influencing the average interface temperature. The model's predictions were confirmed through experimental data, emphasizing the importance of incorporating a wear model in simulating flash temperature development in sliding systems.
Article
Engineering, Mechanical
Francesc Perez-Rafols
Summary: Two-scale models are effective for studying mechanical problems with a wide range of length scales. However, they cannot be directly applied in contact mechanics due to a lack of scale separation, which results in inadequate representation of local-scale results. This work proposes a model that incorporates stochastic variability of local scale results into the global-scale problem to overcome this issue. Several test cases are conducted to demonstrate the model's performance.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Wenbo Zhang, Zhendan Lu, Yunxia Chen, Yawen Zhang
Summary: In this study, the contact behavior of rough surfaces is analyzed using finite element method and multi-scale contact theory, considering the effects of scale and morphology features on contact analysis.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Mechanics
Xuan-Ming Liang, Chun-Yun Jiang, Meng-Rui Wang, Wan-lin Dai, Gang-Feng Wang
Summary: In this study, an optical apparatus is designed to accurately capture the real contact areas between rough metallic samples and flat quartz glass using the frustrated total internal reflection technique and an Otsu method. The incremental equivalent contact model developed by the researchers is employed to predict the load-area relationship, and it shows good agreement with experimentally measured results for samples of various materials and morphologies, confirming the efficiency of the model.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Engineering, Mechanical
Fernando J. Alamos, Martin Philo, David B. Go, Steven R. Schmid
Summary: A pressing concern in superplastic forming (SPF) is the ability to quantitatively model to effectively design tooling and assess process viability. Current finite element method simulations for SPF generally do not include the evolutionary nature of friction under creep conditions. In this study, a new microcontact model of a rough surface in contact with a rigid flat surface is created to predict asperity flattening under creep behavior. Additionally, a semi-empirical equation is established to predict the real contact area and friction at different SPF conditions.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Tobias Brink, Lucas Frerot, Jean-Francois Molinari
Summary: The study proposes a simple model for adhesive wear in dry sliding conditions, which is based solely on material properties and surface parameters, without fit parameters. By explicitly tracking the sliding process, the model connects particle emission rates and sizes to the macroscopic wear rate in a meaningful way. Further controlled wear experiments and parameters from such work are needed to fully verify and enhance the model.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Engineering, Mechanical
Zhaoning Sun, Xiaohai Li
Summary: This study investigates a finite element analysis of a rigid sphere contact with a deformable elastic-plastic plat using an indentation model. The differences between the indentation model and flattening model in terms of contact parameters are compared and analyzed. The effects of plasticity index on rough surface contact parameters are also examined.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
