Article
Physics, Applied
Kazuhiro Oda, Noriko Tsutsumi, Kohei Morita, Takahiro Tsutsumi, Hou Zhong
Summary: In this study, the indentation hardness test was conducted using elastic-plastic finite element analysis. The investigation showed that the wear of indenter tip has minimal effect on the load-penetration depth curve.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2021)
Article
Materials Science, Multidisciplinary
Giacomo Maculotti, Jasurkhuja Kholkhujaev, Gianfranco Genta, Maurizio Galetto
Summary: Instrumented indentation test (IIT) is a depth-sensing hardness test that allows nano- to macro-mechanical characterization of surface mechanical properties. Indenter tip geometry calibration is crucial for ensuring traceability and applicability of IIT. This study proposes a practical direct calibration method using optical surface topography measuring instruments, overcoming the limitations of expensive and impractical direct calibration by AFM or less accurate indirect methods.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Mechanics
Yu-Yun Lin, Deng-Yi Wang
Summary: This research focuses on analyzing the contact force relaxation between an indenter and a poroviscoelastic material to obtain the material's properties. An analytical model and finite element simulations were used to explore the effects of fluid drainage, solid viscoelasticity, and boundary conditions on the relaxation. The results were compared with elastic solutions and showed good agreement.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
D. Chicot, A. Mejias, F. Roudet, A. Montagne, D. Betrancourt, T. Coorevits
Summary: The accuracy of determining mechanical properties in instrumented indentation is influenced by the indenter/material contact area, corrective compliance, and indenter tip defect. This study proposes a calibration method that combines force-function, area-function, and Martens hardness function, and validates it through experiments. The results show that the Young's modulus is close to literature values when introducing an n-factor in the area-function and force-function, and the instrumented hardness and Martens hardness do not vary with indentation force.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Engineering, Mechanical
Zhijie Yu, Yueguang Wei
Summary: This paper investigates the influence of material size-effect and heterogeneity on indentation hardness. It is found that shallow hard inclusions in heterogeneous materials enhance the material hardness more significantly compared to size-independent materials based on conventional plastic theory. The effect of material heterogeneity mainly comes from the non-uniformity of the structure.
ACTA MECHANICA SINICA
(2022)
Article
Chemistry, Physical
Roberto Montanari, Alessandra Varone
Summary: FIMEC is an instrumental indentation test utilizing a cylindrical punch to determine the mechanical properties of metallic materials. Through experimental tests and theoretical knowledge, FIMEC has become a mature technique with great versatility for industrial applications, providing valuable information not obtainable through conventional methods like tensile, bending, and hardness tests.
Article
Materials Science, Multidisciplinary
Giyeol Han, Karuppasamy Pandian Marimuthu, Hyungyil Lee
Summary: In this study, an inverse analysis method based on an artificial neural network (ANN) is proposed to evaluate the material properties of thin film metallic glass (TFMG) via nanoindentation. By using a deeper indentation depth and employing different indenters, the proposed method can accurately identify the film properties and ensure unique solutions. The established ANN model, trained with a systematic finite element analysis (FEA) database, is experimentally validated and shows good accuracy in estimating the material properties.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Victor Kuznetsov, Igor Smolin, Andrey Skorobogatov, Ayan Akhmetov
Summary: This article presents a sliding burnishing scheme using a flat cylindrical indenter. A new tool with a cubic boron nitride indenter provides wide possibilities for nanostructuring burnishing. By changing the tilt angle of the indenter, the contact compression pressure and plastic shear deformation can be controlled, leading to the formation of a nanostructured state of the material. The optimal parameters were determined through finite element modeling and experimental studies.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Electrical & Electronic
Hongchen Liu, Youzheng Wang, Huiying Yu, Fengjiang Wu, Patrick Wheeler
Summary: A novel omnidirectional wireless power transfer (OWPT) system is proposed to address the issues of large switching loss and output power fluctuation in existing systems. The system utilizes a zero-switching-loss inverter and a cylindrical transmitter coil. By introducing an auxiliary resonant network and employing soft-switching techniques, the switching loss in the inverter's main circuit is eliminated and stable power transmission is achieved. Experimental results confirm the feasibility of the OWPT system, demonstrating retained output power and transfer efficiency under various receiver misalignment angles.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Construction & Building Technology
Yunhong Yu, Chenguang Shi, Gang Xu, Zeheng Yao, Tianling Wang, You Wu, Xingyu Yi, Houzhi Wang, Jun Yang
Summary: This study investigates the accuracy of nanoindentation in characterizing the aging behavior of asphalt materials and combines it with DSR frequency sweep tests to macroscopically characterize the aging behavior of asphalt mastic. The results validate the accuracy of nanoindentation in characterizing aging performance and show that aging becomes more pronounced closer to the road surface.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Environmental Sciences
Qingsong Zhang, Zhibin Liu, Yasen Tang, Yongfeng Deng, Tingyi Luo, Yuting Wang
Summary: The mechanical properties of mudstone with different mineral compositions were evaluated using nanoindentation test and deconvolution data analysis method, and the macroscopic mechanical properties were obtained using upscaling models. The results showed that mudstone exhibited high heterogeneity, and the mechanical response of mineral compositions in the interface region was complex.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Chen Wenke, Jin Wuyin
Summary: The finite element method was used to simulate and analyze the axisymmetric nanoindentation response of a transversely isotropic piezoelectric ceramics. The results showed a linear relationship between indentation load and displacement, as well as between electric potential and displacement. Singularities in contact stress and electric field were observed near the edge of the indenter, and they varied exponentially with the thickness of the solids. The study proposed fitting formulas and singular constants for the electric field and stress field under different thicknesses of piezoelectric ceramics.
RARE METAL MATERIALS AND ENGINEERING
(2022)
Article
Physics, Applied
L. A. Boatner, C. B. Finch, W. E. Brundage, J. A. Kolopus, G. R. Gruzalski, K. E. Johanns, P. Sudharshan Phani, G. M. Pharr, W. C. Oliver
Summary: Instrumented indentation experiments at elevated temperatures require careful attention to experimental details, including the choice of indenter tip material. This study used rf-induction heating float-zone and high-temperature solution single-crystal growth techniques to prepare a suite of bulk refractory carbide specimens. These materials were characterized and compared to sapphire and polycrystalline WC-Co, and the results showed that single-crystal WC is a promising candidate for elevated-temperature nanoindentation tips.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Todor Batakliev, Evgeni Ivanov, Verislav Angelov, Giovanni Spinelli, Rumiana Kotsilkova
Summary: The nanomechanical properties of composite specimens based on polylactic acid (PLA) were investigated in this study, which has significant implications for the preparation and characterization of hybrid nanocomposites. Graphene nanoplatelets (GNPs) and multiwall carbon nanotubes (MWCNTs) were used as reinforcing nanoparticles, and a comprehensive analysis including nanoindentation, nanodynamic testing, and nanoscratch experiments was conducted to fully understand the nanoscale surface homogeneity and stress relaxation behavior of the nanocomposite specimens. The research approach contributed to the detection of new nanomechanical features as a function of the type of carbon nanofiller.
Article
Engineering, Mechanical
Chao Chen, Huiyang Zhang, Shengdun Zhao, Xiaoqiang Ren
Summary: This paper studied the effects of sheet thickness and material on the mechanical properties of the clinched joint, finding that the flat clinching process has great potential in joining dissimilar and various thickness materials, with the clinched joint with a stiff top sheet showing increased static strength.
FRONTIERS OF MECHANICAL ENGINEERING
(2021)
