Article
Engineering, Mechanical
Michael Storchak, Hans-Christian Morhring, Thomas Stehle
Summary: The developed friction model takes into account physical-mechanical phenomena in different cutting zones by determining concentrated forces, obtained by experiment or analytical calculation. Friction coefficients are determined as the quotient of normal and tangential forces for each respective zone.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Mohamadreza Afrasiabi, Jannis Saelzer, Sebastian Berger, Ivan Iovkov, Hagen Klippel, Matthias Rothlin, Andreas Zabel, Dirk Biermann, Konrad Wegener
Summary: Numerical simulation of metal cutting using SPH and FEM methods, validated by experimental cutting tests. A novel technique to measure rake face temperature without disrupting chip flow is introduced. Both SPH and FEM accurately predict thermal loads, with SPH showing higher errors in force prediction compared to FEM.
Article
Materials Science, Multidisciplinary
Andres Sela, Daniel Soler, Gorka Ortiz-de-Zarate, Guenael Germain, Francois Ducobu, Pedro J. Arrazola
Summary: A predictive numerical model is proposed for selecting machining tools and cutting conditions, requiring accurate material data and inverse simulation to improve the model and reduce prediction errors.
Article
Quantum Science & Technology
Armin Ahmadzadeh, Hamid Sarbazi-Azad
Summary: Quantum computing is a promising computing paradigm that can provide significant speedup for various tasks. However, we currently lack physical quantum computers and rely on traditional computers to simulate their behavior and test quantum algorithms. In this work, we propose a method to distribute the computation load between CPU and GPU to decrease memory requirement and computation time.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Mechanics
Jie Xu, Yi Deng, Chenxi Wang, Guiqiang Liang
Summary: By proposing an amended friction model, the numerical model was significantly improved in predicting cutting and thrust forces, as well as chip formation. It was demonstrated that the relationship between normal force and friction coefficient is nonlinear in tool-CFRP tangential contact, and the friction coefficient is not a constant value.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
La Han, Junjie Zhang, Yuan Liu, Qiumei Gu, Zengqiang Li
Summary: The study reveals the thermal-mechanical coupled material removal mechanisms of CFRP composites under thermal and cryogenic pretreatments in orthogonal cutting through macro-scale finite element simulations. It also investigates the temperature-dependent material characteristics of CFRP, such as cryogenic embrittlement and thermal softening, which have significant impacts on subsequent cutting processes. Additionally, the coupling effect between fiber orientation and pretreatment temperature on CFRP cutting is addressed, providing guidelines for enhancing machinability of CFRP composites.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Chemical
Jizhou Liu, Xiaodong Li
Summary: To tackle the challenge of high particle concentration in realistic particle acoustic agglomeration process, a novel three-dimensional simulation method with fine-grained GPU-based parallel strategy is proposed in this study. The method employs the Discrete Element Method (DEM) to simulate particle motion, including three major agglomeration mechanisms, two collision processes, and variable porosity of the agglomerates. The fine-grained parallel algorithm allocates the workload of each particle to a GPU thread, resulting in relatively high efficiencies and speedup ratios. Validation of the method demonstrates good agreement with experimental measurements, indicating its ability to reproduce realistic particle agglomeration rates.
Article
Quantum Science & Technology
Stavros Efthymiou, Sergi Ramos-Calderer, Carlos Bravo-Prieto, Adrian Perez-Salinas, Diego Garcia-Martin, Artur Garcia-Saez, Jose Ignacio Latorre, Stefano Carrazza
Summary: Qibo is a new open-source software that allows fast evaluation of quantum circuits and adiabatic evolution using hardware accelerators. It focuses on performance and user simplicity, providing a user-friendly interface.
QUANTUM SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Teodor Dumitru, Marius Gabriel Petrescu, Maria Tanase, Eugen Laudacescu
Summary: This paper presents the results of a complex experimental program that focuses on determining the tribological characteristics of the tungsten carbide tooth tip of asphalt milling equipment. The experiments demonstrate the substantial reduction of wear rate (more than eight times) on the active area of the tooth when water is used during milling. The proposed test method utilizing the Baroid tribometer can effectively evaluate the tribological characteristics of materials using real parts.
Article
Engineering, Manufacturing
Z. M. Cao, C. L. He, W. J. Zong, J. H. Huang, Z. Y. Wei
Summary: A comprehensive model is developed to predict the heat partition ratio and chip temperature rise in diamond turning of a PBX surrogate. The model considers the removal and friction law of powder chips at the tool tip, as well as the diamond tool and important process parameters. By integrating the momentum theorem and energy conservation theory, the cutting heat generation and distribution are clearly outlined. The findings from high-speed face turning experiments reveal the primary cause of temperature increase in the chip is the friction heat at the tool-chip interface, and decreasing the heat partition ratio can lower the risk of thermochemical reactions. Optimizing the diamond tool and reducing the cutting friction coefficient can effectively suppress the proportion of heat obtained from powder chips. The cutting speed is identified as the most important factor affecting the chip temperature rise.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Mechanical
Muhammad Jamil, Ning He, Wei Zhao, Aqib Mashood Khan, Munish Kumar Gupta, Longhui Meng
Summary: The study demonstrates that the novel hybrid lubri-cooling of ethanol-ester oil dry ice shows the lowest friction coefficient and wear rate in metal cutting fluid.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Physical
Marian Bartoszuk
Summary: This article presents an approximate model for determining the maximum temperature of the chip surface in dry orthogonal turning, based on experimental data. The results show good agreement between the model and experimental studies, with a discrepancy of maximum temperature values not exceeding 6.4%.
Article
Engineering, Mechanical
Johannes Lutz, Andreas Gebhard, Frank Zipp, Jens Schuster
Summary: A novel tribometer was designed to evaluate skiing waxes and enable higher sliding speeds compared to existing methods. Testing on waxes with different fluorine content showed that friction decreased with increasing fluorine content, consistent with competition observations. Indirect profilometric wear and roughness measurements indicated that solid-solid interaction was the likely reason for fluorine's effectiveness. Temperature, speed, and loading variable measurements confirmed mixed friction with significant solid-solid interaction.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Chemical
Zakaria Ahmed M. Tagiuri, Thien-My Dao, Agnes Marie Samuel, Victor Songmene
Summary: This paper presents a numerical investigation on the effects of chamfered and sharp cemented carbide tools during orthogonal cutting of AISI 1045 steel. The study reveals different machining characteristics and interactions between cutting parameters, with feed rate and cutting speed being the most significant factors influencing temperature and stress. The analysis also shows strong interactions between chamfer width and cutting speed for chamfer tools, and between cutting speed and feed rate for sharp tools in terms of temperature and stress.
Article
Engineering, Mechanical
Pranay Vinayak Likhar, Adarsh Divakaran, Satish Kailas
Summary: This article introduces a parallel pendulum tribometer designed for experiments at lower sliding speeds. The tribometer overcomes stiffness-related issues and has a higher resolution. The experimental results show that HDSA is more effective in reducing friction at lower sliding velocities compared to HD.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Automation & Control Systems
M. Rothlin, H. Klippel, M. Afrasiabi, K. Wegener
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2019)
Article
Engineering, Mechanical
M. Afrasiabi, M. Roethlin, H. Klippel, K. Wegener
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2019)
Article
Chemistry, Multidisciplinary
Mohamadreza Afrasiabi, Hagen Klippel, Matthias Roethlin, Konrad Wegener
Summary: This paper addresses the challenges in thermal modeling of metal cutting processes using Smoothed Particle Hydrodynamics (SPH) by proposing two improvements: implementing a higher-order Laplacian formulation and introducing a more realistic thermal boundary condition. The proposed framework is validated through simulation of an orthogonal cutting process and comparison with experimental measurements.
APPLIED SCIENCES-BASEL
(2021)
Article
Automation & Control Systems
Hagen Klippel, Stefan Sussmaier, Matthias Roethlin, Mohamadreza Afrasiabi, Uygar Pala, Konrad Wegener
Summary: Diamond wire sawing is developed to reduce cutting loss when cutting silicon wafers, with the goal of achieving a flawless surface for the highest efficiency of silicon solar cells. The transition between ductile and brittle material removal modes can be optimized to minimize surface damage, using a numerical model and simulations with mesh-free methods to handle large deformations.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Marcel Gerstgrasser, Darko Smolenicki, Mansur Akbari, Hagen Klippel, Hans Roelofs, Ezio Cadoni, Konrad Wegener
Summary: A non-linear relationship between fracture strain and temperature was observed in Split Hopkinson Tension Bar tests for free-cutting steel 50SiB8, suggesting a fourth-degree polynomial function for the thermal parts of the original and modified Johnson-Cook fracture strain constitutive equation. Different parameter identification procedures were compared for the original and modified JC fracture models, with the effects of blue-brittleness on temperature factors and corresponding parameters presented. FEM simulations showed that the new adjusted JC model in the blue-brittle temperature range produced more accurate results in terms of fracture diameter and strain, while further experiments are needed to determine parameters.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Engineering, Multidisciplinary
M. Afrasiabi, H. Klippel, M. Roethlin, K. Wegener
Summary: This paper presents the first application of a higher-order SPH method to thermal modeling of metal cutting problems, achieving more accurate heat transfer equation solutions by addressing the consistency issue of standard SPH formulations. The study utilizes a robust surface-detection algorithm and GPU parallel computing to accelerate SPH runtime, leading to more realistic simulations of titanium cutting problems.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Materials Science, Multidisciplinary
Mohamadreza Afrasiabi, Jannis Saelzer, Sebastian Berger, Ivan Iovkov, Hagen Klippel, Matthias Rothlin, Andreas Zabel, Dirk Biermann, Konrad Wegener
Summary: Numerical simulation of metal cutting using SPH and FEM methods, validated by experimental cutting tests. A novel technique to measure rake face temperature without disrupting chip flow is introduced. Both SPH and FEM accurately predict thermal loads, with SPH showing higher errors in force prediction compared to FEM.
Article
Engineering, Mechanical
Rosaria Del Toro, Maria Laura De Bellis, Marcello Vasta, Andrea Bacigalupo
Summary: This article presents a multifield asymptotic homogenization scheme for analyzing Bloch wave propagation in non-standard thermoelastic periodic materials. The proposed method derives microscale field equations, solves recursive differential problems within the unit cell, establishes a down-scaling relation, and obtains average field equations. The effectiveness of this approach is validated by comparing dispersion curves with those from the Floquet-Bloch theory.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Yue Bao, Zhengcheng Yao, Yue Zhang, Xueman Hu, Xiandong Liu, Yingchun Shan, Tian He
Summary: This paper proposes a novel triple-gradient phononic acoustic black hole (ABH) beam that strategically manipulates multiple gradients to enhance its performance. The study reveals that the ABH effect is not solely brought about by the thickness gradient, but also extends to the power-law gradients in density and modulus. The synergistic development of three different gradient effects leads to more pronounced and broader bandgaps in PCs.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Matthias Ryser, Jason Steffen, Bekim Berisha, Markus Bambach
Summary: This study investigates the feasibility of replacing complex experiments with multiple simpler ones to determine the anisotropic yielding behavior of sheet metal. The results show that parameter identifiability and accuracy can be achieved by combining multiple specimen geometries and orientations, enhancing the understanding of the yield behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Wenjun Li, Pengfei Zhang, Siyong Yang, Shenling Cai, Kai Feng
Summary: This study presents a novel two-dimensional non-contact platform based on Near-field Acoustic Levitation (NFAL), which can realize both one-dimensional and two-dimensional transportation. Numerical and experimental results prove the feasibility and ease of this method.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Shuo Liu, Lu Che, Guodong Fang, Jun Liang
Summary: This study presents a novel lamina conjugated bond-based peridynamic (BB-PD) model that overcomes the limitations of material properties and is applicable to composite laminates with different stacking sequences. The accuracy and applicability of the model are validated through simulations of elastic deformation and progressive damage behavior, providing an explanation of the damage modes and failure mechanisms of laminated composite materials subjected to uniaxial loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Omar El-Khatib, S. Kumar, Wesley J. Cantwell, Andreas Schiffer
Summary: Sandwich-structured honeycombs (SSHCs) are hierarchical structures with enhanced mass-specific properties. A model capable of predicting the elastic properties of hexagonal SSHCs is presented, showing superior in-plane elastic and shear moduli compared to traditional honeycombs, while the out-of-plane shear moduli are reduced.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Zhi-Jian Li, Hong-Liang Dai, Yuan Yao, Jing-Ling Liu
Summary: This paper proposes a process-performance prediction model for estimating the yield strength and ultimate tensile strength of metallic parts fabricated by powder bed fusion additive manufacturing. The effect of main process variables on the mechanical performance of printed metallic parts is analyzed and the results can serve as a guideline for improvement. The accuracy of the proposed model is validated by comparison with literature.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
Saman A. Bapir, Kawa M. A. Manmi, Rostam K. Saeed, Abdolrahman Dadvand
Summary: This study numerically investigates the behavior of an ultrasonically driven gas bubble between two parallel rigid circular walls with a cylindrical micro-indentation in one wall. The primary objective is to determine the conditions that facilitate the removal of particulate contamination from the indentation using the bubble jet. The study found that the bubble jet can effectively remove contamination from the indentation for certain ranges of indentation diameter, but becomes less effective for larger indentation diameters.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)
Article
Engineering, Mechanical
E. Polyzos, E. Vereroudakis, S. Malefaki, D. Vlassopoulos, D. Van Hemelrijck, L. Pyl
Summary: This research investigates the elastic and damage characteristics of individual composite beads used in 3D printed composites. A new analytical probabilistic progressive damage model (PPDM) is introduced to capture the elastic and damage attributes of these beads. Experimental results show strong agreement with the model in terms of elastic behavior and ultimate strength and strain.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2024)