Article
Engineering, Mechanical
Valentin Pauly, Joseph Kern, Malcolm Clark, David S. Grierson, Kumar Sridharan
Summary: The study shows that the high-temperature tribological performance of Incoloy (TM) 800HT and Inconel (TM) 617 alloys is influenced by surface hardness, chemistry, and applied load. The formation of a glaze-oxide layer depends on the mechanical integrity of the oxide and the strength of the oxide-substrate interface, with lower loads making it easier to form.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Dietmar Hartwich, Gabor Mueller, Alexander Meierhofer, Danijel Obadic, Martin Rosenberger, Roger Lewis, Klaus Six
Summary: This paper presents a hybrid method for predicting wheel maintenance, combining historical data and multi-body dynamic simulations. The accuracy of the wear model based on maximum contact shear stress was verified.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Pantelis G. Nikolakopoulos
Summary: Engineers and engine manufacturers have long been aware that piston rings are a major source of friction in internal combustion engines, with up to 75% in some cases. The wear and deposition effects on piston rings as a result of poor lubrication can lead to increased oil consumption, emissions, reduced performance, and fuel economy. Through numerical methodologies, researchers have investigated the characteristics of ring deposits in a diesel engine and found that insufficient lubrication can result in thicker films, worst sealing behavior, and other detrimental effects.
SIMULATION MODELLING PRACTICE AND THEORY
(2021)
Article
Dentistry, Oral Surgery & Medicine
Mengdong Peng, Chenxi Li, Cui Huang, Shanshan Liang
Summary: This study utilized digital technologies to achieve minimally invasive rehabilitation, designing veneers that require little to no tooth preparation for cementation, simplifying the manual process and providing a valid and reliable approach to making and cementing multiple CAD-CAM veneers for the minimally invasive restoration of worn teeth.
JOURNAL OF PROSTHETIC DENTISTRY
(2021)
Article
Dentistry, Oral Surgery & Medicine
Veronica P. Lima, Rafael R. Moraes, Niek J. M. Opdam, Jan L. Ruben, Marie-Charlotte D. N. J. M. Huysmans, Bas A. C. Loomans
Summary: This study investigated the ability of two chewing simulation devices to emulate the clinical deterioration observed in anterior composite restorations in severe tooth-wear patients. The Rub&Roll chewing device was able to emulate the clinical deterioration observed in anterior restorations, while the Biocycle-V2 device failed to do so. SEM analysis revealed the presence of microcracking on the surface of the restorations.
JOURNAL OF ADHESIVE DENTISTRY
(2022)
Article
Materials Science, Characterization & Testing
Senthilkumar Thangarajan Sivasankaran, Senthil Kumar Shanmugakani, Vignesh Kumar Vijayakumar, Rathinavel Subbiah, Selvarajan Lakshmanan, Nagaprasad Nagaraj
Summary: This research explores the impact of reinforcement particles on the mechanical and wear properties of AA4032 hybrid and unhybrid metal matrix composites (MMCs). The addition of TiC and h-BN particles improves the wear resistance of the composites and reduces the coefficient of friction and wear rate.
JOURNAL OF TESTING AND EVALUATION
(2023)
Article
Materials Science, Multidisciplinary
Haiyang Li, Xiuqing Fu, Hongbiao Wang, Hongwen Zhang, Yanqing Gu, Xintian Du, Yichen Tao, Jia Li
Summary: This study investigates the wear characteristics of the spindle hook teeth of cotton pickers in different working areas. The results show that there are differences in the composition and hardness of the coating and substrate of the hook teeth. The wear starts from the tooth tips and gradually extends to the tooth edge and surrounding areas.
Article
Medicine, General & Internal
Tobias T. Taubock, Patrick R. Schmidlin, Thomas Attin
Summary: The study evaluated the clinical performance of direct composite restorations in patients with severely worn dentitions at an increased vertical dimension of occlusion for up to 11 years. The overall quality of the restorations was good, with nanofilled composite showing less surface degradation and better margin qualities than microhybrid composite. Patient satisfaction with the treatment approach was high, indicating good long-term performance of the restorations.
JOURNAL OF CLINICAL MEDICINE
(2021)
Article
Dentistry, Oral Surgery & Medicine
Mariele Vertuan, Julia Franca da Silva, Ana Clara Mota de Oliveira, Thayna Teodoro da Silva, Andreza Peres Justo, Fernanda Laudares Silva Zordan, Ana Carolina Magalhaes
Summary: This study aimed to compare the abrasive potential of dentifrices containing activated charcoal with a conventional dentifrice on the development of erosive tooth wear (ETW) in vitro. The results showed that toothpastes containing charcoal combined with pyrophosphate may have a high abrasive effect on eroded tooth surfaces.
INTERNATIONAL DENTAL JOURNAL
(2023)
Article
Computer Science, Interdisciplinary Applications
Shengnan Zhang, Z. L. Sun, Zhenliang Yu, Fanyi Guo
Summary: This paper presents a method for predicting the transient contact position of gears at the meshing point based on the equivalent contact model. By continuously updating the contacting surface profiles through changing pressure angle and chord tooth thickness, the model accurately calculates equivalent pressure angles and surface profiles.
ENGINEERING COMPUTATIONS
(2021)
Article
Engineering, Mechanical
Michael Kucher, Martin Dannemann, Rene Fuessel, Marie-Theres Weber, Niels Modler
Summary: The study analyzed the friction and wear behavior of PEEK in dentistry applications, revealing a significantly higher wear rate of PEEK compared to enamel/dentine, with tooth samples showing increased surface roughness after friction tests.
Article
Engineering, Biomedical
Mahdi Shahmoradi, Boyang Wan, Zhongpu Zhang, Michael Swain, Qing Li
Summary: The study aimed to explore the effects of caries and occlusal wear on the mechanical performance of posterior teeth. It was found that caries, worn marginal ridges, and decreased enamel thickness negatively affected crack initiation load values. Additionally, resin infiltration showed potential for recovering mechanical properties in carious teeth.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Veterinary Sciences
Tomas Sterkenburgh, Ellen Schulz-Kornas, Michael Nowak, Carsten Staszyk
Summary: This study developed a simplified two-dimensional computer simulation of dental wear and provided a tentative explanation for the physiological inclination of the occlusal surface and pathological conditions in equine cheek teeth. The simulation showed that small variations in movement during the chewing cycle and incisor contacts resulted in marked changes in tooth wear patterns.
FRONTIERS IN VETERINARY SCIENCE
(2022)
Article
Anthropology
Lenny Salvagno, Tamsyn Fraser, Idoia Grau-Sologestoa, Umberto Albarella
Summary: Recording the age at death is essential in zooarchaeological analysis, with age estimation based on tooth wear being a commonly used method. However, the assumption of constant tooth wear rate across populations has not been fully verified, raising questions on the accuracy of age estimations. The development of a method to assess wear rate in archaeological teeth is crucial for clearer understanding of age estimation biases.
JOURNAL OF ARCHAEOLOGICAL SCIENCE
(2021)
Article
Dentistry, Oral Surgery & Medicine
Polyvios Charalambous, Saoirse O'Toole, Rupert Austin, David Bartlett
Summary: This study investigated the threshold and accuracy of intraoral scanning in measuring freeform human enamel surfaces. The results showed that the combination of surface registration and subtraction allowed confident measurement of step height above 73 micrometers.
Article
Engineering, Mechanical
Antonella Castellano, Pietro Stano, Umberto Montanaro, Marco Cammalleri, Aldo Sorniotti
Summary: This paper proposes a new control strategy for hybrid electric vehicles, called Model Predictive Control (MPC), and considers the losses in transmission gears. Through a case study on Chevrolet Volt, the results show that the simplified internal model has a minor impact on fuel consumption performance.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Rui Peng, Gregory S. Chirikjian
Summary: This article introduces a method of designing morphable thick-panel origami structures using reconfigurable linkages, which improves the potential of origami techniques for different tasks and solves the limitations of one-DOF and multiple-DOF folding structures.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Gaohan Zhu, Weizhong Guo, Yinghui Li, Youcheng Han
Summary: Comprehensive and accurate performance evaluation is crucial for profile synthesis and analysis of higher pair mechanisms. This paper proposes evaluation indices and methods for the transmission performance of planar higher pair mechanisms from different perspectives. It subdivides the transmission performance into element-based performance and joint-based performance and develops novel indices specific to higher pair mechanisms. A graphical mapping method based on element-based performance is also proposed for intuitive analysis. Practical examples validate the effectiveness of the proposed indices and methods for evaluating the performance of higher pair mechanisms.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Ke Wu, Gang Zheng, Guimin Chen, Shorya Awtar
Summary: Researchers proposed a new modeling method, namely Body-frame Beam Constraint Model (BBCM), to predict and optimize the design of high-precision compliant mechanisms (CMs).
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Youcheng Han, Weizhong Guo, Changjie Zhao, Ziyue Li, Ze Fu, Yinghui Li
Summary: This study proposes a structural synthesis methodology that considers motion, force, and energy characteristics simultaneously to design efficient mechanisms.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Cristian Enrico Capalbo, Daniel De Gregoriis, Tommaso Tamarozzi, Giuseppe Carbone, Domenico Mundo
Summary: This study proposes a novel flexible multibody formulation that enables efficient updating of models while maintaining small size and high accuracy. Numerical validation demonstrates its wide applicability across various materials and mechanisms, showing promising results in terms of accuracy.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Weihao Zhao, Junbei Liao, Wei Qian, Haoyong Yu, Zhao Guo
Summary: This paper presents a newly designed compliant actuator using a tensile springs array to address the challenges in achieving linear and consistent elastic properties, low friction, minor hysteresis, and good compliance in series elastic actuators (SEA). The unique geometry of the spring array enables the SEA to have consistent rotary stiffness with minimal friction and hysteresis. The device's performance is evaluated using PID and sliding mode control, demonstrating its constant low rotary stiffness and torque tracking bandwidth, making it suitable for human-robot interaction requirements.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Mohui Jin, Yukang Luo, Xing Xu, Bowei Xie, Weisheng Wang, Zewei Li, Zhou Yang
Summary: This paper presents a method for evaluating the contact interaction between compliant mechanisms and external objects. By establishing a numerical model and introducing contact springs to describe the contact forces, the deformation and normal contact force/stress can be accurately calculated. The static equilibrium configuration and contact force/stress can be obtained by minimizing the total potential energy function of the system.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Alejandro G. Gallardo, Martin A. Pucheta
Summary: This paper presents a method for the synthesis of parallel flexure systems using Screw Theory and Linear Algebra. The method is validated through three case studies and offers a simple and precise design with decoupled actuators.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Xiao Wang, Chenglin Liu, Haoxiang Sun, Hanwen Song
Summary: This paper presents a new decomposition mode for robot-world calibration, which decomposes the Ad(SE(3)) equation using Chasles' motion. A two-step method based on point set matching is proposed. The superiority of this method is verified through simulations and experiments.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Yanlin Chen, Xianmin Zhang, Yanjiang Huang, Yanbin Wu, Jun Ota
Summary: This study establishes an error model for a 3-RRR+UR spherical parallel mechanism and analyzes the sensitivity of error parameters. A design structure is proposed to reduce input errors based on the analysis. Experimental results show that the multiloop circuit incremental method provides more accurate results.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Vu Linh Nguyen, Chin-Hsing Kuo, Po Ting Lin
Summary: This paper presents a method for analyzing the performance of gravity-balanced serial robotic manipulators under dynamic loads and uses a three-degree-of-freedom planar serial manipulator as a case study. The significance of this method is demonstrated by evaluating the impact of dynamic loads on gravity-balanced performance and proposing a step-by-step design procedure to improve it.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Shifeng Rong, Jiange Zhang, Xing Zhang, Keliang Li, Kaibin Rong, Zhenyu Zhou, Han Ding
Summary: This article proposes a data-driven dry cutting tool collaborative optimization model to improve the economic and environmental attributes of facehobbing hypoid gears. An innovative ease-off tooth contact analysis method is introduced to establish accurate relations between ease-off flank and loaded contact performance evaluations. The proposed model significantly improves sustainability in terms of economic and environmental assessments.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Kemal Eren, Soley Ersoy, Ettore Pennestri
Summary: This research investigates the instantaneous kinematics of the terminal link of a planar two-link open chain using the complex-number technique and higher-order instantaneous invariants.
MECHANISM AND MACHINE THEORY
(2024)
Article
Engineering, Mechanical
Bo Han, Zhantu Yuan, Jiachuan Zhang, Yundou Xu, Jiantao Yao, Yongsheng Zhao
Summary: This paper proposes novel deployable mechanism units with self-limiting position function, and constructs ring truss deployable mechanisms. The degrees of freedom (DOF) of deployable units are analyzed and it is proved that the constructed ring truss deployable mechanisms have only one DOF. The dynamic model of the deployable mechanism unit with passive actuation is established and verified by simulation. The deployable mechanism units proposed in this paper have the advantages of good scalability and stability, and have broad application prospects.
MECHANISM AND MACHINE THEORY
(2024)