Article
Automation & Control Systems
Vito Busto, Donato Coviello, Andrea Lombardi, Mariarosaria De Vito, Donato Sorgente
Summary: In the past few decades, various numerical models have been developed to simulate the keyhole laser welding process, including sophisticated multiphase models and less computationally expensive thermo-mechanical models. This study used a double-conical volumetric heat source to evaluate the laser joining process of sheets with different thicknesses, and the experiments showed that the model could satisfactorily estimate the shape and dimensions of the fused zone.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Thermodynamics
R. M. Farias, P. R. F. Teixeira, L. O. Vilarinho
Summary: This study proposes two variable profile heat sources with only two geometrical parameters to achieve accurate simulation results for various welding processes, base materials, and plate thicknesses. Numerical simulations in ANSYS (R) APDL software show that the new heat sources have equal or better agreement with experimental weld profiles and thermal cycles compared to classical heat sources, namely the 3D Conical and the Double Ellipsoid.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
A. K. Mondal, B. Kumar, S. Bag, Y. Nirsanametla, P. Biswas
Summary: The accuracy of the welding heat source model affects the prediction accuracy of the thermal profile of the welded joint. The geometric shape of the moving heat source in fusion welding is determined by the welding speed, with the avocado shape heat source model proposed as a more realistic and flexible approximation model.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Jiaming Sun, Bin Zhao, Diankui Gao, Lizhi Xu
Summary: The Chirplet finite element model was established to enhance the computing accuracy and reduce the computing time of heat transfer in the evaporator of an air source heat pump. The analysis results demonstrate that the Chirplet finite element method has the highest computing accuracy and the least computing time, showing wide application prospects in various fields.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
Article
Chemistry, Physical
Jun Fu, Qing Tao, Xiaoan Yang, Bogdan Nenchev, Ming Li, Biao Tao, Hongbiao Dong
Summary: An experiment on electro-gas welding (EGW) of 30 mm thickness E36 steel plates was conducted, examining the impact of different heat source path methods on the thermal profile of welds. The oscillate-stop heat path was found to predict the thermal profile more accurately than the sinusoidal function and linear heat path for EGW welding of 30 mm thickness and above.
Article
Construction & Building Technology
Changhong Chen, Songlin Bai, Ying Huang, Lik Lam, Yao Yao, Leon M. Keer
Summary: A meso-mechanical pretreatment algorithm was developed to create a random ellipsoidal aggregate model for fully graded concrete, improving packing efficiency. The study on the effect of ellipsoidal shape on packing fraction revealed insights into the random packing of aggregate particles.
MAGAZINE OF CONCRETE RESEARCH
(2021)
Article
Engineering, Marine
Luca Romanin, Paolo Ferro, Filippo Berto
Summary: A new approach utilizing virtual elements for modeling weld bead in the elastic-plastic field and auxiliary elements for applying equivalent loads determined by experiments on a single welded joint has been proposed. An inverse analysis algorithm specific to this method was developed for application. The model was tested on a real welded assembly with variations in welding sequence and clamping conditions, showing good agreement with experimental results even with changes in these parameters.
Article
Thermodynamics
Juan C. Alvarez Hostos, Bruno Storti, Benjamin A. Tourn, Victor D. Fachinotti
Summary: This study introduces a novel overlapping nodes scheme within the framework of an improved element-free Galerkin (IEFG) formulation to solve the transient heat conduction problem involving a moving heat source in arc welding processes. The proposed approach utilizes two overlapping arrangements of nodes to transfer temperature and heat flux information and achieve accurate computation of temperature distribution and heat flux.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Sergejs Tarasovs, Andrey Aniskevich
Summary: The identification of anisotropic thermal conductivity of a material was achieved using the transient plane source method and inverse solution. Through three measurements and transient finite element analysis, the accurate calculation and identification of thermal conductivity were realized. The obtained results were validated and found to be consistent with the results calculated using conventional finite element methods.
Article
Physics, Fluids & Plasmas
Linyang Wei, Hong Qi, Guojun Li, Weijun Zhang
Summary: The new method combining the generalized source term multiflux method and ray tracing technique is developed for calculating arbitrary directional radiative intensity. It shows a close accuracy to backward Monte Carlo method and a much higher efficiency. Therefore, this method has the potential to solve radiative intensity problems in graded-index media.
Article
Thermodynamics
Barbaros Cetin, Yigit F. Kuscu, Baris Cetin, Ozgur Tumuklu, Kevin D. Cole
Summary: In this study, the semi-analytical source method was successfully applied to a 3-D fully-transient heat conduction problem with a moving heat source, allowing for modeling of arbitrary spatial distribution of heating with time varying power. The method's key advantage is the spatial discretization being required only on the path of the heating source and at observation locations, rather than the entire domain. Furthermore, the parallelization of the semi-analytical method using MPI demonstrated excellent scalability with increasing number of processors and time domain.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Automation & Control Systems
Hanling Wu, Yingjie Guo, Haijin Wang, Fei Yuan, Huiyue Dong, Yinglin Ke
Summary: In this study, a dynamic heat distribution model and TEP-FE approach are proposed to calculate the welding deformation on the reserved-clearance in multi-pass double-sided arc welding (DSAW) process. The heat distribution and moving heat approach is iterated in the TEP-FE analysis, taking into account heat convection and radiation dissipation. The results show that the proposed method accurately predicts the welding deformation on the reserved-clearance.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Wei Qiang, Kehong Wang, Shiqing Wang, Yongxin Lu, Qian Gao
Summary: The DSHSSW process produces top-quality aluminum alloy weld beads with enhanced fusion area and melting efficiency compared to one-side welding (OSW). The process utilizes medium heat input, no arc spacing, no root gap, and upward vertical direction, resulting in superior joints and improved energy utilization. Additionally, DSHSSW leads to increased penetrating ability through arc constriction and heat accumulation effects as weld penetration deepens.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Multidisciplinary
Houichi Kitano, Yoshiki Mikami
Summary: This study proposes a framework based on deep learning networks to accurately estimate the temperature history of processes with local heat input and find appropriate heat source parameters. The results of the study demonstrate the accurate determination of heat source parameters under known and unknown conditions.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Bharat Singh, Piyush Singhal, Kuldeep K. Saxena, Ravindra K. Saxena
Summary: This study evaluates the significance of considering the latent heat effect during phase change in a three-dimensional finite element numerical simulation of arc welding. The developed mathematical model incorporating latent heat effect provides accurate predictions compared to experimental values. It is crucial to account for the latent heat of fusion, solidification, and vaporization in numerical simulations involving phase change analysis.
METALS AND MATERIALS INTERNATIONAL
(2021)
Review
Materials Science, Multidisciplinary
Ignacio Peralta, Victor D. Fachinotti, Juan C. Alvarez Hostos
ADVANCED ENGINEERING MATERIALS
(2020)
Review
Construction & Building Technology
Nadia D. Roman, Facundo Bre, Victor D. Fachinotti, Roberto Lamberts
ENERGY AND BUILDINGS
(2020)
Article
Engineering, Biomedical
Lucas Colabella, Adriaan Cisilino, Victor Fachinotti, Carlos Capiel, Piotr Kowalczyk
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2020)
Article
Chemistry, Physical
Victor D. Fachinotti, Facundo Bre, Christoph Mankel, Eduardus A. B. Koenders, Antonio Caggiano
Article
Mathematics, Applied
Victor D. Fachinotti, Alejandro E. Albanesi, Fernando G. Flores
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2020)
Article
Engineering, Multidisciplinary
Juan C. Alvarez Hostos, Marcela A. Cruchaga, Victor D. Fachinotti, Javier A. Zambrano Carrillo, Esteban Zamora
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2020)
Article
Engineering, Multidisciplinary
Juan C. Alvarez Hostos, Victor D. Fachinotti, Ignacio Peralta
Summary: The study introduces a novel approach for designing mechanical devices to manipulate displacement fields in linear elastic materials under thermal gradients. By optimizing the distribution of candidate materials, the designed devices are easy to manufacture and can successfully control displacement fields.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Thermodynamics
Benjamin A. Tourn, Juan C. Alvarez Hostos, Victor D. Fachinotti
Summary: This work proposes the extension of total variation regularization strategies to solve one-dimensional linear inverse heat conduction problems. Three solution procedures are tested and compared in terms of their performance, showing that the staircase effect dominates the reconstructions. Despite deteriorating the quality in some cases, it does not prevent the appropriate fulfillment of the reconstruction task. This study demonstrates the suitability and reliability of extending total variation approaches as a novel alternative to standard procedures in solving linear inverse heat conduction problems involving the estimation of surface heat fluxes.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Mathematics, Applied
Juan C. Alvarez Hostos, Joselynne C. Salazar Bove, Marcela A. Cruchaga, Victor D. Fachinotti, Rafael A. Mujica Agelvis
Summary: This communication presents the solution of steady-state two-dimensional lid-driven square cavity flows at high Reynolds numbers using a velocity-based formulation developed in the context of the improved element-free Galerkin-reduced integration penalty method (IEFG-RIPM). The analysis demonstrates excellent agreement with mesh-based solutions reported in the literature, showing the potential of IEFG-RIPM as a feasible and reliable numerical technique for such benchmark problems.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Thermodynamics
Benjamin A. Tourn, Juan C. Alvarez Hostos, Victor D. Fachinotti
Summary: This study introduces an online sequential implementation of a gradient-based method for reconstructing transient heat transfer coefficients in the context of non-linear one-dimensional heat conduction problems, denoted as the sequential quasi-Newton method (SQNM). The proposed method is fast, robust, and reliable, demonstrating its suitability for reconstructing transient heat transfer coefficients in one- and two-dimensional non-linear heat conduction problems as a novel alternative strategy to other online inverse estimation procedures.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Juan C. Alvarez Hostos, Bruno Storti, Benjamin A. Tourn, Victor D. Fachinotti
Summary: This study introduces a novel overlapping nodes scheme within the framework of an improved element-free Galerkin (IEFG) formulation to solve the transient heat conduction problem involving a moving heat source in arc welding processes. The proposed approach utilizes two overlapping arrangements of nodes to transfer temperature and heat flux information and achieve accurate computation of temperature distribution and heat flux.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Construction & Building Technology
Ignacio Peralta, Victor D. Fachinotti, Eduardus A. B. Koenders, Antonio Caggiano
Summary: This study examines the inclusion of Phase Change Materials in cement-based collectors to improve energy efficiency. Through numerical simulations and analysis of weather variables, the optimal melting temperatures were determined for different climates.
ENERGY AND BUILDINGS
(2022)
Article
Mathematics, Applied
Bruno A. Storti, Alejandro E. Albanesi, Ignacio Peralta, Mario A. Storti, Victor D. Fachinotti
Summary: Problems with moving sources and moving inner boundaries are effectively addressed using the Chimera method. The method is based on non-matching grids and captures high gradients by defining moving objects on fine meshes that move across fixed backgrounds. The Chimera method is implemented in the finite element method framework and is assessed for accuracy and stability through numerical tests, demonstrating its good performance in addressing convection-dominated problems and three-dimensional arc welding processes.
FINITE ELEMENTS IN ANALYSIS AND DESIGN
(2022)
Article
Thermodynamics
Benjamin A. Tourn, Juan C. Alvarez Hostos, Victor D. Fachinotti
Summary: This work introduces the sequential quasi-Newton method (SQNM) for solving the inverse design problem of estimating transient boundary heat fluxes in the solidification processes of alloys. The method satisfactorily estimates the heat fluxes using few future measurements, but some instabilities have been observed. To address this issue, a modified version of SQNM, called mSQNM, is proposed which employs an inexact line search strategy. The performance of mSQNM in estimating the heat fluxes is shown to be improved.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Mechanics
Eliana Sanchez, Alejandro Cosimo, Olivier Bruls, Alberto Cardona, Federico J. Cavalieri
Summary: This paper studies the general motion of a sphere in contact with a rigid planar surface under rolling, sliding, and spinning friction in the context of non-smooth contact dynamics. The equations of motion are solved using a non-smooth generalized implicit time integration scheme, which ensures exact satisfaction of position and velocity level constraints without the need for defining a penalty parameter. The geometrical properties of the spheres are described using a rigid-body formulation with translational and rotational degrees of freedom. Various examples, including flexible and/or rigid elements, demonstrate the robustness and performance of the proposed methodology.
MULTIBODY SYSTEM DYNAMICS
(2023)